A method of treating a shape memory alloy to improve its various characteristics and to cause it to exhibit a two-way shape memory effect. A raw shape memory alloy having a substantially uniformly fine-grained crystal structure is prepared and then its crystal orientations are arranged substantially in a direction suitable for an expected operational direction, such as tensile or twisting direction or the like, in which the shape memory alloy is expected to move when used in an actuator after the completion of the treatment.
This trial compared vascular healing response between self-expanding nitinol stent and self-expanding paclitaxel-eluting stent in the superficial femoral
TY - CONF. T1 - Computer simulation of microstructural evolution in Ni-rich TiNi shape memory alloys under applied stresses. AU - Li, D. Y.. AU - Chen, Long-qing. PY - 1998/1/1. Y1 - 1998/1/1. N2 - Coherent Ti11Ni14 precipitation in TiNi shape memory alloys and its variation under applied stresses were investigated using a diffuse-interface phase-field model. In this model, the structural difference between the precipitate phase and the matrix as well as the orientational difference between precipitate variants are distinguished by structural field variables, whereas the compositional difference between the precipitate phase and the matrix is distinguished by a concentration field variable. The temporal variation of the field variables is determined by solving the Ginzburg-Landau equations and the Cahn-Hilliard equation. Precipitate morphologies and their variation under strain-constraints were studied.. AB - Coherent Ti11Ni14 precipitation in TiNi shape memory alloys and its variation under ...
The application of Nitinol shape memory alloys (SMA) in steel connections is evaluated using connections incorporating SMA tendons. Shape memory alloys are a class of alloys that exhibit thermo-mechanical characteristics that are ideally suited for seismic applications. They have the ability to dissipate significant energy with little permanent deformation, and possess highly reliable energy dissipation based on a repeatable solid state phase transformation. To assess the validity of using SMA in real structures, two full-scale connections are tested. The tests are conducted on exterior joint specimens and tested according to the SAC testing protocol. The beams are W24 x 94 and the columns W14 x 159, all of A572 Grade 50 steel. Companion regular steel connections are tested for comparison. The connections are of a T-stub type, with four 11/2 inch diameter SMA rods providing the tensile resistance to the column. The specimens are re-tested several times to determine the ability of the SMA rods to ...
Actuator concepts utilizing NiMnGa, ferromagnetic shape memory alloy are investigated for potential use on a smart rotor for trailing edge flap actuation. With their high energy density, large dynamic stroke, and wide operating bandwidth, ferromagnetic shape memory alloys (FSMA) like NiMnGa, seem like attractive candidates for smart rotor actuators, potentially able to fulfill the requirements for both primary rotor control and vibration suppression. However, because of the recent discovery of the material, current experimental data and analytical tools are limited. To rectify these shortcomings, an extensive set of detailed experiments were conducted on samples of NiMnGa to characterize the response of the alloy for a wide variety of mechanical and magnetic loading conditions. Measurements of the material performance parameters such as power density, damping properties, magneto-mechanical coupling, and transduction efficiency were included. Once characterized, the experimental data were used to ...
Define Magnesium alloy. Magnesium alloy synonyms, Magnesium alloy pronunciation, Magnesium alloy translation, English dictionary definition of Magnesium alloy. n. Symbol Mg A light, silvery-white, moderately hard metallic element that in ribbon or powder form burns with a brilliant white flame. Obtained chiefly...
The primary goal of the Consortium for the Advancement of Shape Memory Alloy Research and Technology (CASMART) is to enable the design of revolutionary applications based on shape memory alloy (SMA) technology. In order to help realize this goal and reduce the development time and required experience for the fabrication of SMA actuation systems, several modeling tools have been developed for common actuator types and are discussed herein along with case studies, which highlight the capabilities and limitations of these tools. Due to their ability to sustain high stresses and recover large deformations, SMAs have many potential applications as reliable, lightweight, solid-state actuators. Their advantage over classical actuators can also be further improved when the actuator geometry is modified to fit the specific application. In this paper, three common actuator designs are studied: wires, which are lightweight, low-profile, and easily implemented; springs, which offer actuation strokes upwards ...
Single crystal Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) are active materials which produce strain when a magnetic field is applied. The large saturation strain (6%) of Ni-Mn-Ga, and material energy density comparable to piezoelectric ceramics make Ni- Mn-Ga an interesting active material. However, their usefulness is limited by the bulky electromagnet required to produce a magnetic field. In this thesis, a novel actuation method is developed for shape memory alloys in their martensitic phase, whereby asymmetric acoustic pulses are used to drive twin boundary motion. Experimental actuators were developed using a combination of Ni-Mn-Ga FSMA single crystals and a piezoelectric stack actuator. In bi-directional actuation without load, strains of over 3% were achieved using repeated pulses (at 100 Hz) over a 30 s interval, while 1% strain was achieved in under 1 s. The maximum strains achieved are comparable to the strains achieved using bi-directional magnetic actuation, although the time ...
Market Research Future Published a Half-Cooked Research Report on Global Shape Memory Alloys Research Report. Market Highlights: Global shape memory alloys (SMA) market is estimated to expand at a CAGR of 10.79% to reach USD 11,079.1 million by the end of 2023. SMA is gaining prominence in the global market with the growing usage in the end use industries such as biomedical, spacecraft, aircraft, transport, electrical appliances, construction & housing, subsea, hot water supply, and others. Free Sample Report at Here @ https://www.marketresearchfuture.com/sample_request/5997 – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 8e3cc6-NWQxY
Shape Memory Alloys Market is anticipated to reach USD XX.X BN by 2026 with a CAGR of 13%, this market report provides the key players, trends, growth & forecast of the market based on in-depth research by industry analyst. The global market size, share along with dynamics are covered in the shape memory alloys market report
Background: Restenosis following nitinol stent implantation in the superficial femoral artery (SFA) predominantly occurs within a year, but continues to occur with lower rates afterwards. However, factors associated with restenosis remain unclear. We sought to investigate the factors associated with restenosis within a year and beyond in this study.. Methods: We studied 431 limbs in consecutive 309 patients with peripheral artery disease (74±9 years, male 72%, claudicator 70%) who underwent successful endovascular therapy (EVT) for de novo SFA lesions. Nitinol stents (Luminexx in 93 limbs; Smart in 338 limbs) were provisionally deployed from April 2004 to December 2008. We classified the limbs as: early restenosis group = restenosis occurred within a year, 68 limbs; late restensosis group = restensosis occurred beyond a year, 24limbs; no-restenosis group, 339 limbs. Restenosis was detected by duplex ultrasound and stent fracture was identified by X-ray. A multiple logistic analysis was ...
The goal of this thesis is to develop a full dimensional micromechanics-inspired constitutive model for polycrystalline shape-memory alloys. The model is presented in two forms: (1) The one-dimensional framework where we picture the ability of the model in capturing main properties of shape memory alloys such as superelasticity and shape-memory effect; (2) The full dimensional model where micromechanics origins of the model, the concepts emerged from those analysis and their relation to macroscopic properties in both single and polycrystals are presented.. We use this framework to study the effects of the texture and anisotropy in the material behavior. Since phase transformation often competes with plasticity in shape-memory alloys, we incorporate that phenomenon into our model. We also demonstrate the ability of the model to predict the response of the material and track the phase transformation process for multi-axial, proportional and non-proportional loading and unloading experiments. We ...
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Shape memory alloy (SMA) microactuators are under development for use in soft bodied robotics. These actuators take advantage of the shape memory effect of nickel-titanium alloys (nitinol) to deliver high force and large strain in a solid-state, thin film actuator. The actuators will be used for generating motion in an all-soft-material robotic platform that attempts to mimic some of the features of the tobacco hornworm caterpillar, Manduca Sexta. The devices described in this work are unique due to their thin patch-like structure, which will allow them to be laminated onto, or embedded into, the soft wall of the robot. The actuator patches consist of a nitinol microwire on a flexible polyimide base. The overall dimensions of the patches vary from 7.75 x 3.5 mm to 22 x 10 mm. The wires are 0.1 -0.8 mm wide. The polyimide is photodefined in a mesh structure so that the sheet is much more compliant in tension and compression than a flat sheet. The nitinol microwire meanders across the polyimide structure
TY - JOUR. T1 - Effect of travel speed on quality and welding efficiency of friction stir welded AZ31B magnesium alloy. AU - Baghdadi, Amir Hossein. AU - Selamat, Nor Fazilah Mohamad. AU - Sajuri, Zainuddin. AU - Kokabi, Amir Hossein. PY - 2018/1/1. Y1 - 2018/1/1. N2 - Weight reduction is one of the most concerning issues of automotive and aircraft industries in reducing fuel consumption. Magnesium (Mg) alloys are the lightest alloys which can be used in the structure due to low density and high strength to weight ratio. Developing a reliable joining process of magnesium alloys is required due to limited ductility and low workability at room temperature. Friction stir welding (FSW) is a solid-state welding process that can be performed to produce sound joints in magnesium alloys. Researchers have performed investigations on the effect of rotation and travel speeds in FSW of AZ31B magnesium alloy. However, there is lack of study on the FSW parameters, i.e. travel speed below 50 mm/min and ...
A shape memory alloy consists of a three element alloy of nickel-titanium-copper which is formed as being subjected to a cold working and to a heat treatment at a temperature below recrystallization point of the alloy for storing the shape, the alloy being thereby improved in operation stability and reliability even after repetitive operation and made wider in environmental temperature range for use therein of the alloy.
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An implantable probe having an elongated sheath with provision for remotely positioning a device disposed within the elongated sheath. In one embodiment, the device is a circuit board, and a shape memory alloy (SMA) such as Nitinol is used to fabricate one or more actuators that are coupled to the circuit board. The shape memory effect exhibited by the SMA actuator is thermally activated. Electrical current is selectively applied to the actuator to resistively heat the SMA to a temperature sufficient to change its shape. When the shape of the SMA changes, the actuator moves the circuit board or other device longitudinally within the elongated sheath so that the light emitted is directed to a different portion of a treatment site. In another embodiment, the circuit board is rotated about its longitudinal axis within the sheath. In still another embodiment, the actuator moves a piston so as to pump a fluid through a pair of lumens disposed within the sheath to dissipate heat produced by the light emitting
We describe herein biocompatible single crystal Cu-based shape memory alloys (SMAs). In particular, we show biocompatibility based on MEM elution cell cytotoxicity, ISO intramuscular implant, and hemo-compatibility tests producing negative cytotoxic results. This biocompatibility may be attributed to the formation of a durable oxide surface layer analogous to the titanium oxide layer that inhibits body fluid reaction to titanium nickel alloys, and/or the non-existence of crystal domain boundaries may inhibit corrosive chemical attack. Methods for controlling the formation of the protective aluminum oxide layer are also described, as are devices including such biocompatible single crystal copper-based SMAs.
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A polycrystalline Ni 41Co 9Mn 40Sn 10 (at. %) magnetic shape memory alloy was prepared by arc melting and characterized mainly by magnetic measurements, in-situ high-energy X-ray diffraction (HEXRD), and mechanical testing. A large magnetoresistance of 53.8% (under 5 T) and a large magnetic entropy change of 31.9 J/(kg K) (under 5 T) were simultaneously achieved. Both of these values are among the highest values reported so far in Ni-Mn-Sn-based Heusler alloys. The large magnetic entropy change, closely related to the structural entropy change, is attributed to the large unit cell volume change across martensitic transformation as revealed by our in-situ HEXRD experiment. Furthermore, good compressive properties were also obtained. Lastly, the combination of large magnetoresistance, large magnetic entropy change, and good compressive properties, as well as low cost makes this alloy a promising candidate for multifunctional applications. ...
In this study some new concepts regarding certain aspects related to shape memory polymers are presented. A blend of polylactic acid (PLA) (80%) and polybutylene succinate (PBS) (20%) was prepared first by extrusion, then by injection molding to obtain the samples. Tensile, stress-relaxation and recovery tests were performed on these samples at 70 °C. The results indicated that the blend can only regain 24% of its initial shape. It was shown that, this partial shape memory effect could be improved by successive cycles of shape memory tests. After a fourth cycle, the blend is able to regain 82% of its shape. These original results indicated that a polymer without (or with partial) shape memory effect may be transformed into a shape memory polymer without any chemical modification. In this work, we have also shown the relationship between shape memory and property memory effect. Mono and multi-frequency DMA (dynamic mechanical analyzer) tests on virgin and 100% recovered samples of polyurethane (PU)
In spite of some good successes and excellent researches of Nickel-titanium shape memory alloy (NiTi-SMA) in reconstructive surgery, there are still serious limitations to the clinical applications of NiTi alloy today. The potential leakage of elements and ions could be toxic to cells, tissues and organs. This review discussed the properties, clinical applications, corrosion performance, biocompatibility, the possible preventive measures to improve corrosion resistance by surface/structure modifications and the long-term challenges of using SMAs.
With the progress of miniaturization, shape memory alloy (SMA) actuators exhibit high energy density, self-sensing ability and ease of fabrication, which make them well suited for practical applications. This paper presents a self-sensing controlled actuator drive that was designed using antagonistic pairs of SMA wires. Under a certain pre-strain and duty cycle, the stress between two wires becomes constant. Meanwhile, the strain to resistance curve can minimize the hysteresis gap between the heating and the cooling paths. The curves of both wires are then modeled by fitting polynomials such that the measured resistance can be used directly to determine the difference between the testing values and the target strain. The hysteresis model of strains to duty cycle difference has been used as compensation. Accurate control is demonstrated through step response and sinusoidal tracking. The experimental results show that, under a combination control program, the root-mean-square error can be reduced to 1.093
By leveraging the core competence in special metallurgy and industrial high volume production capabilities, SAES Getters, as a Shape Memory Alloys
The elbow joint is a complex articulation composed of the humeroulnar and humeroradial joints (for flexion-extension movement) and the proximal radioulnar articulation (for pronation-supination movement). During the flexion-extension movement of the elbow joint, the rotation center changes and this articulation cannot be truly represented as a simple hinge joint. The main goal of this project is to design and assemble a medical rehabilitation exoskeleton for the elbow with one degree of freedom for flexion-extension, using the rotation center for proper patient elbow joint articulation. Compared with the current solutions, which align the exoskeleton axis with the elbow axis, this offers an ergonomic physical human-robot interface with a comfortable interaction. The exoskeleton is actuated with shape memory alloy wire-based actuators having minimum rigid parts, for guiding the actuators. Thanks to this unusual actuation system, the proposed exoskeleton is lightweight and has low noise in operation with
My research work has been based on both fundamental and applied science, with a dominant theme of steel metallurgy. During an academic career spanning more than thirty years, the emphasis of my research has shifted progressively towards the applied end of the research spectrum. The publications are divided into two streams: martensitic transformations and shape memory alloys (Section 2.1); and welding and thermomechanical processing of steels (Section 2.2). The first stream has involved research that tends to be more fundamental in nature, whereas the second stream has more immediate industrial significance. Although these fields represent the two major thrusts of my research work, the complete list of publications (Appendix 2) indicates wider activity that includes the fields of surface engineering, creep of pressure vessel steels, engineering ceramics, recrystallisation in non-ferrous materials, solidification and archeometallurgy.
We have studied adiabatic temperature change ÎTad in a Ni50Mn36Co1Sn13 metamagnetic shape memory alloy. An irreversible character of ÎTad has been observed in the vicinity of the reverse martensitic transformation. In this region, cyclic application of the magnetic field converts comparatively large inverse magnetocaloric effect (MCE) with ÎTadmax=-0.8 K to a weaker conventional MCE (ÎTadmax=0.3 K). The crossover of ÎTad has been attributed to the irreversible character of the magnetic field-induced transformation and the closeness of the martensitic transformation and Curie temperature of the austenitic phase TCA ...
This paper presents the position and vibration control of a single flexible slewing structure driven by a DC motor at the slewing axis. The position is controlled over the current applied to the DC motor armature. To control the vibration of the flexible structure Shape Memory Alloys (SMA) are applied to them. The control is made through the State Dependent Ricatti Equations (SDRE) technique which uses sub-optimal control and system local stability search. Numerical simulations and experimental results are presented which demonstrate the effectiveness of the proposed control strategy.. ...
A coupled kinetic Monte Carlo - Finite Element Analysis (kMC-FEA) method is developed with a numerical implementation in the Scalable Implementation of Finite Elements at NASA (ScIFEN). This method is presented as a mesoscale model for Shape Memory Alloy (SMA) material systems. The model is based on Transition State Theory and predicts the nonlinear mechanical behavior of the 1st order solid-solid phase transformation between Austenite and Martensite in SMAs. The kMC-FEA modeling method presented in this work builds upon the work of Chen and Schuh [1, 2]. It represents a
A shape memory alloy is a type of metal which has the property of being able to contract a certain length when heated to a certain temperature then reve...
Mallik, U.S. and Sampath, V. (2008) Effect of Composition and Ageing on Damping Characteristics of Cu-Al-Mn Shape Memory Alloys. Materials Science and Engineering A, 478, 48-55.
The Shape Memory Alloys market report provides a detailed analysis of global market size, regional and country-level market size, segmentation market growth, ma
Press release - Future Market Insights - Macroeconomic and Microeconomic Shape Memory Alloy Market Analysis by Future Market Insights - published on openPR.com
small study in which 40 patients underwent nitinol stent placement in the SFA and then had a follow-up angiography, stent fracture occurred in 28% (11/40) after a mean follow-up of 13.6 months, more in patients who walked more in the time after the procedure. A retrospective analysis of 239 patients who underwent femoro-popliteal nitinol stent placement for claudication and critical limb ischemia reported a 4 year stent fracture rate of 17% and primary patency rate of 65%, similar to patients in whom there was no fracture. Clinical outcomes were not reported. A retrospective analysis of 742 limbs in 585 consecutive patients who underwent de novo SFA nitinol stent placement reported a primary and secondary patency rate of 67% and 86% at 6 years, respectively. Stent fracture, observed in 14% of limbs, was associated with early restenosis (P=0.0004). The association between stent fracture and clinical outcomes has been described in one small study of 53 patients who were followed for a median of 16 ...
Microstructural simulation of friction stir welding using a …. Microstructure evolution model The microstructural evolution during FSW of AZ91 magnesium alloy is simulated using the coination of CA and LJ methods in Deform-3D software which are coupled to the thermo-mechanically, rigid-viscoplastic FEM model of FSW. Microstructure and interfacial reactions of soldering …. The U.S. Department of Energys Office of Scientific and Technical Information @article{osti_22066166, title = {Microstructure and interfacial reactions of soldering magnesium alloy AZ31B}, author = {Liu , E-mail: [email protected] and Zhonghui, Wu}, abstractNote = {In this paper, economic and innoxious solder alloys with low melting temperature were designed for AZ31B.. Microstructure characterization of LAE442 magnesium …. The magnesium alloy LAE442 was processed by extrusion and equal channel angular pressing (ECAP) to achieve ultrafine grained microstructure. Detailed characterization of the microstructure was ...
Ni2MnGa based ferromagnetic alloys are ideal candidates for applications such as actuators, magnetic refrigerators or magnetostrictive transducers due to their attractive properties such as magnetic field induced shape memory effect and large magnetocaloric effect. The properties of these alloys (e.g., the martensitic transformation temperature T (M) ) sensitively depend on the composition. Understanding the composition dependence of these properties so as to design the alloy as desired is one of the main research topics in this area. In recent years, we have investigated the composition dependent elastic modulus and phase stability of Ni2MnGa-based alloys by using a first-principles method, in hope of clarifying their connection to the properties of these alloys. In this article, we review the main results of our investigations. We show that the tetragonal shear modulus C is a better predictor of the composition dependent T (M) than the number of valence electrons per atom (e/a) since the ...
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Cardiology Research and Practice is a peer-reviewed, Open Access journal that publishes original research articles, review articles, and clinical studies that focus on the diagnosis and treatment of cardiovascular disease. The journal welcomes submissions related to systemic hypertension, arrhythmia, congestive heart failure, valvular heart disease, vascular disease, congenital heart disease, and cardiomyopathy.
This trial will investigate the efficacy and tolerability of nitinol self-expanding biolimus A9-eluting stents [Axxess Plus; Devax] in patients with de novo
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We report the first-in-human experience with a new self-expanding THV and motorized delivery system. A TAVR with the CENTERA THV and motorized delivery system was performed successfully in 15 patients with good hemodynamic and clinical short- and midterm outcomes.. The CENTERA THV design shares some similarities with current balloon-expandable THVs (SAPIEN and SAPIEN XT, Edwards Lifesciences). All incorporate bovine pericardial tissue leaflets and an internal polyethylene terephthalate paravalvular seal and use relatively short stent frames. The salient difference is the self-expanding nitinol frame, with a flared inflow, narrower annular segment, and a larger-diameter outflow. This shape is designed to facilitate self-seating in the aortic annulus. In comparison with most other self-expanding nitinol valves the CENTERA THV does not extend into the ascending aorta for anchoring or self-alignment.. The CENTERA fixation and alignment is dependent on the self-seating stent frame but also on a ...
Using XRF + LIBS Together: When and How It Makes …. For aluminum and magnesium alloys, despite low sensitivity for magnesium, handheld XRF still delivers very accurate results. By normalizing results to 100%, handheld XRF results are insensitive to sample size, shape and roughness facilitating accurate measurement of …. Alloys for Manufacturing and Industry - Alfa Aesar. View Alfa Aesars comprehensive list of alloy products available for purchase online, including aluminum alloys, copper alloys, stainless steel alloys, nickel alloys and titanium alloys. I agree Our site saves small pieces of text information (cookies) on your device in order to …. 3 Legged Thing Punks Anarchy Travis Magnesium Alloy …. 3 Legged Thing Punks Anarchy Travis Magnesium Alloy Tripod System with AirHed Neo Ideal for Everyday use Product Details Product Dimensions: 3.94 x 3.94 x 64.96 inches. Metals market prices, forecasts & analysis , Argus Media. Metals Argus Metals provides current metal prices for over 1,000 ...
The low density and high specific strength of magnesium alloys have created a great deal of interest in the use of these alloys in the automotive and aerospace industries and in portable electronics. All of these industries deal with applications in which weight is extremely important. However, an obstacle to overcome when using magnesium alloys in engineering applications are their unsatisfactory corrosion properties. This thesis is devoted to the atmospheric corrosion of the two magnesium alloys AZ91D and AM50, in particular the ways the microstructure and exposure parameters of these alloys influence their corrosion behaviour. The work includes both laboratory and field studies. The results obtained show that the microstructure is of vital importance for the corrosion behaviour under atmospheric conditions.. The microstructure of magnesium-aluminium alloys contains different intermetallic phases, e.g. Al8Mn5 and β-Mg17Al12. The local nobility of these intermetallic phases was measured on a ...
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The global Copper and Copper Alloy Foil (=0.07mm) market has seen a potential growth over the past years. The Copper and Copper Alloy Foil (=0.07mm) industry is estimated to reach USD 1,409.0 million in 2022, growing at a CAGR of 6.14% between 2017 and 2022 according to this study.. Global Copper and Copper Alloy Foil (=0.07mm) Market report has been composed and based on an in-depth market analysis with inputs from industry professionals and Copper and Copper Alloy Foil (=0.07mm) research Information about the technological advancements influencing the growth. The motive of the global Copper and Copper Alloy Foil (=0.07mm) market report is to interpret the trends and forecasts for the Copper and Copper Alloy Foil (=0.07mm) market over the upcoming years. The prime focus of the Copper and Copper Alloy Foil (=0.07mm) market report is to define and specify Past-Current Size, Copper and Copper Alloy Foil (=0.07mm) Shares, Price, Segment & Forecast up to 2022. Further, the study gives a proper ...
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According to the Unified Numbering System (UNS): Coppers are copper alloys, containing not less than 99.3% of copper. Wrought coppers are designated with the numbers from C10100 through C157600. High copper alloys are copper alloys, containing more than 96% but less than 99.3% of copper. Wrought High Copper Alloys are designated with the numbers from C16200 through C19600. Alloys from these groups have any major alloying elements but may contain small amounts of beryllium (Be), chromium (Cr), phosphorous (P), silver (Ag), arsenic (As), sulfur (S), lead (Pb), tin (Sn), zirconium (Zr), magnesium (Mg), iron (Fe), cadmium (Cd) and tellurium (Te) as minor alloying additives. Coppers and high copper alloys have very high electric and heat conductivity, very high ductility and relatively low hardness and tensile strength. High copper alloys have better hardness and tensile strength, but lower ductility than coppers. The alloys may be strengthened by cold work (strain hardening). Ductility of the alloys ...
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Thermal oxidation induced during laser cleaning of an …. It was found that thermal oxidation took place on the aluminium-magnesium alloy during the irradiation in air with a laser energy ranged from 0.6 to 1.4 J cm-2. It has been demonstrated that this thermal oxidation had the same mechanism as in the case of the steady state thermal oxidation of the aluminium-magnesium alloys even though the laser irradiation was applied only for the very short Powder Metallurgy of Magnesium Is it Feasible - …. A Study of Corrosion Film Growth on Pure Magnesium and a Creep-Resistant Magnesium Alloy in an Automotive Engine Coolant Shi, Z. / Mallick, P. / McCune, R. / Simko, S. / Naab, F. / Minerals, Metals and Materials Society , 2010. Impact of COVID-19 on Global Automotive Magnesium …. 2020/7/25· The latest report published with an innovative statistics of the market titled as Automotive Magnesium Alloy Market acknowledges Size Appliion Segment, Type, Regional Outlook, Market Demand, Latest Trends, ...
abstractNote = {Neutron scattering is a very efficient method for investigating shape-memory alloys such as Cu-Zn-Al and Cu-Zn. The shape-memory effect is related to a martensitic phase transition, which is not yet fully understood. The two aims of this work are the determination of crystal structure of both phases and finding precursors of the martensitic transition in the parent phase. For a refinement of the crystal structure of the low-temperature phase I investigated first the crystal symmetry, because in most previous work a wrong crystallographic space group was used. Furthermore it was necessary to take stacking faults into account for an exact determination of the structure of the martensite. In the parent phase the degree of order and the temperature factors were determined. In order to investigate precursor effects elastic diffuse and inelastic measurements were performed in the parent phase. The phonon dispersion curves of all symmetry directions for Cu-Zn-Al and some phonon branches ...
TY - CONF. T1 - Corrosion behavior of flame-resistant Calcium-added Magnesium alloy in NaCl aqueous solution containing various anion species. AU - Tsunakawa, Mika. AU - Shiratori, Ryota. AU - Nakamura, Kae. AU - Ishizaki, Takahiro. PY - 2016/1/1. Y1 - 2016/1/1. N2 - Flame-resistant Ca-added Mg alloys are highly desirable as the materials for transport industry from viewpoints of the safety and lightweight. Recently, exposure tests of the Ca-added Mg alloys demonstrated that the anion species other than chloride ion, such as nitrate and sulfate ions, were present in the corrosion products formed on the Mg alloys. However, details of the corrosion behavior of the Ca-added Mg alloys have been not yet clarified. In this study, we aimed to investigate the corrosion behavior of the flame-resistant Ca-added Mg alloy in NaCl aqueous solution with and without sulfate ions by immersion testing. XRD and FT-IR measurements demonstrated that the corrosion products formed on the Ca-added Mg alloy AZX612 were ...
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United States Beryllium Aluminum Alloy Industry 2016 Market Research Report is a new market research publication announced by Reportstack. This report is a professional and in-depth study on the current state of the Beryllium Aluminum Alloy industry.. The report provides a basic overview of the industry including definitions, classifications, applications and industry chain structure. The Beryllium Aluminum Alloy market analysis is provided for the United States markets including development trends, competitive landscape analysis, and key regions development status.. Development policies and plans are discussed as well as manufacturing processes and Bill of Materials cost structures are also analyzed. This report also states import/export consumption, supply and demand Figures, cost, price, revenue and gross margins.. To access full report with TOC, please visit United States Beryllium Aluminum Alloy Industry 2016 Market Research Report. The report focuses on United States major leading industry ...
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A radiopaque nitinol medical device such as a guide wire or a stent for use with or implantation in a body lumen is disclosed. The stent is made from a superelastic alloy such as nickel-titanium or nitinol, and includes a ternary element selected from the group of chemical elements consisting of iridium, platinum, gold, rhenium, tungsten, palladium, rhodium, tantalum, silver, ruthenium, or hafnium. The added ternary element improves the radiopacity of the nitinol stent comparable to that of a stainless steel stent of the same size and strut pattern coated with a thin layer of gold. The nitinol stent has improved radiopacity yet retains its superelastic and shape memory behavior and further maintains a thin strut/wall thickness for high flexibility. For the guide wire application, a distal core section is made of the nitinol alloy with a ternary element addition thus improving radiopacity over that of distal core section made from a binary nickel-titanium alloy.
Powertrain applications of alloy AJ62 arose from its comparative resistance to high temperature deformation among magnesium alloys. In this research, AJ62 permanent-mould cast in different section thicknesses was subjected to immersion corrosion in commercially-available engine coolant. The objective was to determine corrosion behaviour variation among casting thicknesses. Corrosion product accumulation suggests passive film formation, and unlike in other media, the film exhibits certain stability. Extreme thicknesses were used to generate polarization curves for their respective microstructures in engine coolant. Variation with casting section thickness was observed in the curves. These preliminary results indicate coarsened microstructures reduce corrosion resistance of the permanent mold cast AJ62 alloy ...
Stress corrosion cracking (SCC) of Mg alloys is intergranular (IGSCC) or transgranular (TGSCC). A continuous or nearly continuous second phase, typically along grain boundaries, causes IGSCC by microgalvanic corrosion of the adjacent Mg matrix. IGSCC is expected in all such alloys, typical of most creep resistant alloys, because each known second phase has a more positive corrosion potential than the matrix a-Mg; the degree of severity depends on the electrochemical properties of the second phase; these electrochemical properties need to be studied. Nearly continuous second phases can be avoided by Mg alloy design. TGSCC is most likely caused by an interaction of hydrogen (H) with the microstructure. A study of H-trap interactions is needed to understand this damage mechanism, and to design alloys resistant to TGSCC. Understanding is urgently needed if wrought alloys are to be used safely in service, because prior research indicates that many Mg alloys have a threshold stress for SCC of about ...
The multi-center, prospective and post-market surveillance study has been designed to assess the rate of stroke or death within 72 hours of the procedure in patients treated with the Wingspan stent system.. Wingspan stent system is a self-expanding Nitinol stent and delivery system developed to treat intracranial atherosclerotic disease.. According to the company, the patients suffering from intracranial atherosclerotic disease (ICAD) may benefit from endovascular treatment with the Wingspan stent system.. The trial demonstrated that patients securing on-label treatment with the Wingspan system showed a 2.6% observed rate of stroke or death compared against the pre-specified rate for early success that was established as 4.0% with a minimum 150 patients.. The Gateway PTA balloon catheter is an over-the-wire balloon catheter for pre-dilate the lesion prior to insertion and deployment of the Wingspan stent system.. Wingspan stent system with Gateway percutaneous transluminal angioplasty (PTA) ...
List of Figure Figure Automotive Inner Fenders Picture Figure Industry Chain Structure of Automotive Inner Fenders Figure Manufacturing Process of Automotive Inner Fenders Figure SWOT of Automotive Inner Fenders Figure Hard Plastic Resins Market Size and Growth, 2015-2019 (USD Million) Figure Hard Plastic Resins Market Size and Growth, 2015-2019 (in Volume) Figure Aluminium Alloy Market Size and Growth, 2015-2019 (USD Million) Figure Aluminium Alloy Market Size and Growth, 2015-2019 (in Volume) Figure Plastic Steel Market Size and Growth, 2015-2019 (USD Million) Figure Plastic Steel Market Size and Growth, 2015-2019 (in Volume) Figure Others Market Size and Growth, 2015-2019 (USD Million) Figure Others Market Size and Growth, 2015-2019 (in Volume) Figure Hard Plastic Resins Market Estimates and Forecasts, 2020-2025 (USD Million) Figure Hard Plastic Resins Market Estimates and Forecasts, 2020-2025 (in Volume) Figure Aluminium Alloy Market Estimates and Forecasts, 2020-2025 (USD Million) Figure ...
Title: Modeling the fatigue behavior of thermomechanical shape memory alloys: Application to the optimization of biocompatible actuators for cardiac implants.. Subject: The aim of this project is the development of a thermomechanical modeling tool, robust and able to capture the different inelastic mechanisms that occur under cyclic loading in shape memory alloys (phase transformation, martensitic reorientation, plasticity, damage). This tool will be implemented in the finite element program ABAQUS in order to predict the fatigue of actuators for biomedical engineering applications. The developed model will be operated for the prediction and optimization of the fatigue strength of an innovative cardiac assist actuator equipped with SMA biocompatible material (NiTi and TiNb) under non-isothermal, cyclic and multiaxial, non-proportional loading conditions. The cardiac implant is a lamellar system consisting of a superelastic SMA and it has been designed in collaboration with the Nancy School of ...
A nanofluidic peristaltic pump includes an elongated tubular member having a first end, an opposed second end, and an elastic wall defining a flow channel extending between the first and second ends; and a series of shape memory alloy actuator wires extending across and at least partially around the outer surface of the elastic wall at spaced positions along the length of the tubular member, wherein the actuator wires are configured to reversibly and directly compress the wall, and thereby constrict regions of the flow channel, upon an electrothermally induced phase transition of the shape memory alloy. With the flow channel at the first end of the tubular member in fluid communication with a fluid source, an electric current is delivered to the actuator wires to sequentially activate and deactivate them and cause fluid to flow through the flow channel from the first end toward the second end.
Desalination has become the Middle East and other water-scarce areas of the main ways to obtain fresh water. Desalination production methods, the most widely used is a multi-stage flash method, the method is mainly composed of water heating equipment, heat recovery condenser Ministry, the Ministry of the condenser heat output, ventilation and jet condenser and other parts compressor, heat exchange positions with a large number of heat transfer tube, the original copper alloy tube, copper alloy impatience as corrosion, has now been replaced by titanium tubes. One plate heat exchanger, heat exchanger plate used in the materials industry, mainly in stainless steel, titanium and titanium alloys, nickel and nickel alloy cold-rolled sheet. 127 for pure titanium plate heat exchanger, industrial pure titanium and titanium alloys 276, 345 for the tube heat exchanger. And compared with tube heat exchanger manufactured by TA1 titanium plate heat exchanger has many advantages in the market has a strong ...
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The wear behavior of deformed magnesium alloy AZ61 under dry conditions was evaluated. Two types of AZ61 alloy were used, extruded and rolled samples, to investigate the effect of deformation process on the wear behavior. The experiments were performed using a pin-on-ring type wear apparatus against a stainless-steel counterface under applied stresses in the range of 3-7 MPa, and within a sliding velocity range of 0.2-1.8 m/s. The topographical images of the eroded surfaces at different sliding velocity for extruded and rolled samples were quantified using fractal analysis. The results revealed that for all applied stress, the wear rates increased with increasing the sliding velocity of both samples. The wear rate of the rolled samples is greater than that of the extruded samples at the stress range from 3 to 5 MPa. However, when the stress is increased to 7 MPa the wear rate of the rolled samples is lower than that of the extruded samples. The variation of fractal value of slope of linearized ...
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A wrought aluminum alloy that has very high corrosion resistance and good deformation properties. Heat-exchanger components can be produced from an aluminum alloy of this type, especially heat-exchang
Magnesium and magnesium alloys - Determination of manganese - Periodate photometric method (Manganese content between 0,01 and 0,8 %)
NEW YORK, Sept. 23, 2010 (GLOBE NEWSWIRE) -- Advanced Battery Technologies, Inc. (Nasdaq:ABAT), a leading developer, manufacturer and distributor of rechargeable Polymer Lithium-Ion (PLI) batteries as well as a manufacturer of electric vehicles, today announced that it received an order to sell aluminum magnesium alloy electric scooters valued at $0.35 million to Italy-based Menzaghi Motors. The company expects to ship these electric scooters in the fourth quarter 2010.
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Jul 31 2009 ·The purpose of this paper is to provide a review of the technology and applications of shape‐memory materials (SMMs). This paper initially considers various classes of SMMs and their properties. It then discusses applications and concludes with a brief review of recent research and future prospects. SMMs include shape‐memory alloys (SMAs) ferromagnetic SMAs (FSMAs) and shape Chat Online ...
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TY - GEN. T1 - Fatigue modification of TA15 titanium alloy weldments by an ultrasonic impact treatment. AU - Gao, Yukui. AU - Zhong, Zheng AU - Zhang, Xiaodan. AU - Wang, Yuhui N1 - Conference code: 35. PY - 2014. Y1 - 2014. N2 - The welded components of TA15 titanium alloy were ultrasonically impact treated. The fatigue lives were investigated under the same test conditions. The fatigue strength was determined by stair-step method and the residual stresses were analyzed by an X-ray diffraction stress tester. The results show that the fatigue properties of TA15 titanium alloy welded components are sensitive to the surface treatment and ultrasonic impacting can prolong the fatigue lives. The effect of fatigue strength improvement mainly depends on compressive residual stresses and grain refinement.. AB - The welded components of TA15 titanium alloy were ultrasonically impact treated. The fatigue lives were investigated under the same test conditions. The fatigue strength was determined by ...
Titanium alloys are still a young material. However, the first alloys developed at the end of the 1940s were already making aviation and aerospace history: They made it possible to enter the jet engine age and thus step into a new era. In the meantime, titanium alloys are increasingly establishing themselves in the chemical industry, the construction industry, medical technology, as well as in the offshore, energy and automotive sectors due to their high specific strength, excellent corrosion resistance, outstanding biocompatibility and other properties. At the same time, global titanium production is increasing every year.. As the energy-intensive extraction of raw materials makes titanium relatively expensive compared with other metals, research has long been trying to reduce costs by developing new manufacturing processes or ways of recycling materials. Other key areas of work include the development of new alloys with special properties, improved oxidation resistance and easier machining. If ...
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Dilute chromic acid and the organosilane bis-1,2-(triethoxysilyl)ethane (BTSE) were compared by their abilities to act as post-treatment rinses for samples of 2024-T3 aluminum alloy, which had previously been coated by zinc phosphate. The first approach is conventionally used to improve corrosion protection, but alternatives are needed because of environmental concerns with Cr(VI). Variations in conditions for application of the final rinse, especially through changes in solution concentration, were compared by measuring polarization curves, which provide an indication of corrosion stability. These comparisons were related to coating morphology, which was studied using scanning electron microscopy (SEM), and to studies of chemical composition with X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray (EDX) spectroscopy. Immersion tests in NaCl solution were applied to post-treated zinc phosphate coatings that had been formed on mirror-polished alloy surfaces. Overall, the ...
Copper and its alloys generally display a severe reduction in ductility between roughly 300 and 600 degrees C, a phenomenon variously called intermediate temperature embrittlement or ductility trough behaviour. This review of the phenomenon begins by placing it in the wider context of the high-temperature fracture of metals, showing how its occurrence can be rationalised in simple terms on the basis of what is known of intergranular creep fracture and dynamic recrystallisation. Data in the literature are reviewed to identify main causes and mechanisms for embrittlement, first for pure copper, and then for monophase and multiphase copper alloys. Coverage then turns to the grain boundary embrittlement phenomenon, caused by the intergranular segregation of even minute quantities of alloying additions or impurities, which appears to worsen dramatically the intermediate temperature embrittlement of copper alloys. Finally, metal-induced embrittlement, including in particular liquid metal embrittlement,
The key to Orville and Wilbur Wrights historic 1903 flight was wing warping. Today, NASA engineers are developing a similar technique to increase the performance and efficiency of fixed-wing aircraft. The goal is to be able to bend and fold wings in-flight without using complex hydraulic systems or mechanical linkages. In the future, subsonic and supersonic aircraft equipped with the technology may weigh up to 80 percent less than aircraft that rely on traditional wing flaps. The Spanwise Adaptive Wing (SAW) project aims to validate . . .
WE43B magnesium is a magnesium alloy. Cited properties are appropriate for the T6 temper. To achieve this temper, the metal is solution heat-treated and artificially aged until it meets standard mechanical property requirements. WE43B is the ASTM designation for this material. M18432 is the UNS number.. It has a fairly high base cost among magnesium alloys. In addition, it has a very low thermal conductivity and a very low ductility.. The graph bars on the material properties cards below compare WE43B magnesium to other magnesium alloys (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means its 50% of the highest, and so on. ...
TY - JOUR. T1 - Outcomes of a Polytetrafluoroethylene Hybrid Vascular Graft with Preloaded Nitinol Stent at the Venous Outflow for Dialysis Vascular Access. AU - Habibollahi, Peiman. AU - Mantell, Mark P.. AU - Rosenberry, Trish. AU - Leeser, David B.. AU - Clark, Timothy W.I.. PY - 2019/2. Y1 - 2019/2. N2 - Background: To evaluate outcomes and patency of arteriovenous grafts (AVGs) created using Gore hybrid vascular grafts in hemodialysis patients with limited venous outflow or challenging anatomy. Materials and methods: A retrospective review was performed in two academic centers of all patients between July 2013 and December 2016 who underwent surgical AVG creation using a Gore hybrid vascular graft in a brachial artery to axillary configuration. Patient characteristics and comorbidities as well as graft patency, function, and subsequent need for percutaneous interventions were recorded. Results: Forty-six patients including 30 females (65.2%) and 16 males (34.8%) with a mean age of 63 ± 13 ...
The similarity in external appearance of the various alloys, along with the different combinations of elements used when making each alloy, can lead to confusion when categorizing the different compositions. There are as many as 400 different copper and copper-alloy compositions loosely grouped into the categories: copper, high copper alloy, brasses, bronzes, copper nickels, copper-nickel-zinc (nickel silver), leaded copper, and special alloys. The following table lists the principal alloying element for four of the more common types used in modern industry, along with the name for each type. Historical types, such as those that characterize the Bronze Age, are vaguer as the mixtures were generally variable.. ...
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