• Abnormal or discontinuous grain growth, also referred to as exaggerated or secondary recrystallisation grain growth, is a grain growth phenomenon through which certain energetically favorable grains (crystallites) grow rapidly in a matrix of finer grains resulting in a bimodal grain size distribution. (wikipedia.org)
  • High strain rate superplasticity (HSRS) was obtained in a commercial 5083 Al alloy by introducing a ultrafine grained structure of 0.3 small mu, Greekm through severe plastic deformation and by adding a dilute amount of scandium (Sc) as a microstructure stabilizer. (northwestern.edu)
  • The results of this study showed that increasing the temperature increases the austenite grain size, with a sharp gradient observed at higher temperatures. (ui.ac.id)
  • Dense alumina ceramics (relative density \u003e= 99.0%) thus obtained had a uniform microstructure composed of fine grains, where the average grain size developed for non-doped, Ni-doped, Mg-doped and Ca-doped samples was 0.67, 0.67, 0.47 and 0.30 mu m, respectively, showing that Ca-doping is the most promising method for tailoring of nanocrystalline alumina ceramics. (nii.ac.jp)
  • GAMMA-AL2O3"}]}, "item_6_textarea_68": {"attribute_name": "wosonly abstract", "attribute_value_mlt": [{"subitem_textarea_value": "Dense submicron-grained alumina ceramics were fabricated by pulse electric current sintering (PECS) using M(2+)(M: Mg, Ca, Ni)-doped alumina nanopowders at 1250 degrees C under a uniaxial pressure of 80 MPa. (nii.ac.jp)
  • The intergranular type is characterized by the dispersion of ZrO2 particles at the Al2O3 grain boundaries, resulting in pinning, which leads to transgranular fracture and improved toughness. (amberandmark.com)
  • Al2O3 microstructure composites that combine textured components, developed in situ using templated grain growth (TGG), and fine-grained equiaxed components. (psu.edu)
  • Textured Al2O3 exhibited transgranular fracture, as well as lower strength and fracture toughness than the fine-grained equiaxed Al2O3. (psu.edu)
  • Texture is obtained in situ using templated grain growth (TGG). (psu.edu)
  • In ceramic materials this phenomenon can result in the formation of elongated prismatic, acicular (needle-like) grains in a densified matrix with implications for improved fracture toughness through the impedance of crack propagation. (wikipedia.org)
  • This type of grain growth is of importance in the toughening of silicon nitride materials Silicon carbide has been shown to exhibit improved fracture toughness as the result of AGG processes yielding elongated crack tip/wake bridging grains, with consequences for applications in ballistic armor. (wikipedia.org)
  • In 2023, Liss et al have shown that a spontaneous activation of a grain boundary leads to activation of the one grain in an otherwise inactive microstructure. (wikipedia.org)
  • Sintering: Densification, Grain Growth, and Microstructure. (wikipedia.org)
  • Among them, the intragranular type refers to the formation of microcracks and secondary interfaces within the grain by nanoparticles, weakening the main grain boundary effect and reducing the tip elastic modulus, thereby slowing down crack propagation. (amberandmark.com)
  • A nanocrystalline layer with an average grain size of 75 nm was formed on the top surface layer of 321 stainless steel (321SS) alloy via severe shot peening (SSP). (ac.ir)
  • Although many gaps remain in our fundamental understanding of AGG phenomena, in all cases abnormal grain growth occurs as a result of very high local rates of interface migration and is enhanced by the localized formation of liquid at grain boundaries. (wikipedia.org)
  • This activation of grain boundaries, erratic rotation and growth already starts at temperatures well below the partial melting of the boundaries, however, when melting occurs, the effect is emphasized. (wikipedia.org)
  • Tungsten carbide has been reported to exhibit AGG of faceted grains in the presence of a liquid cobalt-containing phase at grain boundaries Silicon nitride (Si3N4) may exhibit AGG depending on the size distribution of β-phase material in an α-Si3N4 precursor. (wikipedia.org)
  • This abnormal grain growth is attributed to the synergistic effect of dislocation annihilation in grain boundaries and triple points, re-arrangement of dislocations, and formation of middle angle (13 e17 ) grain boundaries. (ac.ir)
  • Cavity stringers were formed parallel to the tensile axis by interlinkage of jagged-shaped isolated cavities along grain boundaries aligned to the tensile axis. (northwestern.edu)
  • Large grains behave like multiple smaller grains even before a dislocation substructure can evolve. (stanford.edu)
  • In the presence of alkali dopants or a solid state ZrSiO4 dopant, rutile has been observed to crystallise from a parent anatase phase material in the form of abnormally large grains existing in a matrix of finer equiaxed anatase or rutile grains. (wikipedia.org)
  • Dopants used to promote TGG (SiO2 + CaO) were included in the templated tapes and dopants used to prevent abnormal grain growth (MgO) were included in the non templated tapes, which are subsequently stacked, laminated, and co-sintered. (psu.edu)
  • High anisotropy in interfacial energy (solid-liquid))or grain boundary energy (solid-solid) in bulk materials. (wikipedia.org)
  • We discuss the applicability of the proposed phase-field simulation technique, based on theGBor interfacial energy database to simulations for microstructural evolution, including abnormal grain growth, phase transformations, etc., in a wider range of polycrystalline materials. (icams.de)
  • The experimental results show that MnS precipitates provided the main pinning forces during casting due to the high solubility temperature, but MnS particles did not provide a sufficient pinning force to prevent the austenite grains from growing. (strath.ac.uk)
  • The phase-field model is applied to a grain growth simulation of polycrystalline bcc Fe to investigate the effect of anisotropic GB energy on the microstructural evolution and its kinetics. (icams.de)
  • The first step involves local formation of graphene wrinkles and is initiated directly after completing the CVD growth of a single graphene layer that conformally covers the surface of a polycrystalline platinum substrate. (researchsquare.com)
  • Gluten is a generic term for the storage proteins found in wheat, rye, and barley, but it is also found in all grains to some extent. (glutenfreesociety.org)
  • As an additive to your portfolio, picking up some of these grains or the wheat-soybean basis opportunistically as a speculative lottery ticket looks pretty good here. (blogspot.com)
  • These problems may include an inability to properly absorb nutrients or intolerance of a protein called gluten found in wheat and other grains ( celiac disease ). (medlineplus.gov)
  • In addition, ZrO2 particles are dispersed in the matrix and also play a role in refining the grain size of the second phase. (amberandmark.com)
  • You detect it when you palpate something the size of a sesame seed, poppy seed, grain of rice, or bigger, or when you see an abnormal growth that has probably invaded the basement membrane and is in stage III or IV. (dentistryiq.com)
  • Grain-to-grain interactions dominate the plasticity of Al thin films and establish effective length scales smaller than the grain size. (stanford.edu)
  • Continuous growth on antagonist also leads to impairment of root meristem size, which suggests that iGluR-like channels may play a role in meristem maintenance. (intechopen.com)
  • Via the oxidation-led annealing plus seeded growth strategy, the research team obtained more than 30 types of copper foils the size of A4 paper (~30×21 cm2), which is roughly the same size as US legal. (unist.ac.kr)
  • The mechanical data revealed that the deformation of the former was governed by grain boundary sliding but that of the latter was dominated by viscous glide. (northwestern.edu)
  • Undigested gluten will then contribute to abnormal growth of bacteria, the byproducts of which will cause an indirect reaction by the immune system. (glutenfreesociety.org)
  • A culture of a strain of Salmonella bacteria that lacks an enzyme needed for growth is exposed to possible carcinogens. (scienceclarified.com)
  • Previous literature has focused on how electromagnetic fields have been used to exert influence on metallurgical phenomena, such as grain boundary migration, grain boundary segregation, formation of texture, recrystallization, precipitation, phase transformation and sintering. (sbir.gov)
  • HSRS of the alloy was attributed to the combined effects of dynamic recrystallization and preservation of fine recrystallized grains by the presence of Sc. (northwestern.edu)
  • Lesion detection and COE protocols are extremely important in getting an abnormal finding to a definitive diagnosis from an oral pathologist. (dentistryiq.com)
  • If unequivocal hyperglycemia is absent, two abnormal test results are required for diagnosis, using the same sample or two separate test samples. (medscape.com)
  • BaTiO3 barium titanate with an excess of TiO2 is known to exhibit abnormal grain growth with profound consequences on this materials piezoelectric performance. (wikipedia.org)
  • Russia overcame the consequences of abnormal drought in 2010 and farmers harvested a good grain crop. (thepoultrysite.com)
  • The study shows that vanadium does not have any effect on austenite grain growth at 1 150°C because of its low solubility temperature in austenite. (strath.ac.uk)
  • They used the huge surface area of nano powder to reduce the sintering temperature and inhibit the abnormal growth of grains to improve the toughness. (amberandmark.com)
  • Low‐Temperature Control of Twins and Abnormal Grain Growth in BaTiO3. (pmoptics.com)
  • It relies on the ability to balance between graphene growth and etching, and facilitates temperature induced reconstruction of the substrate surface. (researchsquare.com)
  • Our experimental observations are supported by density functional theory (DFT) calculations and kinetic Monte-Carlo (KMC) growth simulations. (researchsquare.com)
  • These converted cells can form clumps of cartilage, which then shed into the space around the joint, forming loose bodies that may be no larger than a grain of rice, and cause pain and swelling. (msdmanuals.com)
  • The quantitative calculation of austenite grain growth generated from this model fit well with the experimental grain growth data obtained during reheating of niobium steels. (ui.ac.id)
  • Growth techniques that enable the production of defect-free single-layer sheets of graphene and other 2D materials have been considerably developed in recent years 1, 2 . (researchsquare.com)
  • In this work, we summarize our systematic experimental and theoretical investigations on the growth of twisted-layer graphene. (researchsquare.com)
  • Based on real-time spatially resolved observations of CVD graphene growth, we describe their formation and demonstrate how assisted self-assembly of intertwined spirals can be used to fabricate twisted layer graphene with a controllable twist-angle. (researchsquare.com)
  • It basically consists of a sequence of wrinkle formation, folding, cutting and the subsequent growth of the twisted layer graphene 11-15 . (researchsquare.com)
  • abnormal growth causes the development of intricate grain patterns and vivid colors that cannot be found anywhere else. (jerryrhoadswoodturning.com)
  • Keshan Disease is a cardiomyopathy characterized by cardiac enlargement, abnormal ECG patterns, cardiogenic shock, and congestive heart failure, with multifocal necrosis of the myocardium. (cdc.gov)
  • Strain distributions arise not only from the distribution of grain sizes and orientation, but also from the differences in grain shape and from stress environment. (stanford.edu)
  • It is shown that there are significant orientation and strain/stress variations between grains and inside individual grains. (stanford.edu)
  • The clinical oral examination is considered by many to be the standard of care for detecting abnormal oral mucosal changes, including cancer. (dentistryiq.com)
  • As shape memory alloys are increasingly applied at smaller length scales due to advantages in achievable actuation frequency and the growth of micro-scale applications in medical devices, the anisotropy of the shape memory response at the grain level becomes an important consideration for optimizing device performance. (columbia.edu)
  • An experimentally validated Monte-Carlo grain growth model is developed to predict the texture formation based on the anisotropy in the surface energy between the growing grains and the adjacent liquid. (columbia.edu)
  • The formation of crystallographic texture in NiTi thin films through controlled melting and abnormal grain growth during solidification is investigated through the use of x-ray diffraction and electron backscatter diffraction measurements. (columbia.edu)
  • Just as cloning in biology allows for the creation of one or more replicas of the exact same genes, seeded growth in chemistry can produce a very large metal foil with the exact same surface texture as that of a seeded one. (unist.ac.kr)
  • Because it has a slower rate of growth, longleaf pine was not replanted as widely as other faster growing species. (southernpine.com)
  • Antique heart pine" or "reclaimed heart pine" refers to lumber from old growth Southern Pine, regardless of species, salvaged as timbers from old factories, mills or barns, or recovered as "sinker" logs from river bottoms. (southernpine.com)
  • The greatest portion of dietary intake occurs from organic forms of selenium, mainly the amino acids selenomethionine and selencysteine, in grains, cereals, and forage crops. (cdc.gov)
  • The AlN pinning effect was evident at 1 333 min equalisation time, and was able to prevent further austenite grain growth by providing an additional pinning force. (strath.ac.uk)
  • Insufficient attention has been paid to predicting the austenite grain growth of microalloyed steel and the effect of undissolved microalloys. (ui.ac.id)
  • Between daily wood chopping at his desk and scavenging for food in the company pantry, Macro Clown often involves himself in the most unlikely of markets for that of a macro trader: grains and softs. (blogspot.com)
  • A 3D phase-field model for grain growth combined with a grain boundary (GB) energy database is proposed. (icams.de)
  • Hypersensitivity pneumonitis was originally described in 1713 as an occupational lung disease in grain workers and later, in 1932, in farmers inhaling moldy hay contam- inated with thermophilic actinomyces, hence the term farmer's lung.1 With this recog- nition, modernization of farming methods has resulted in the reduction in farmer's lung prevalence estimated at 0.5% to 3% of exposed farmers in studies spanning from 1980 to 2003. (cdc.gov)
  • The here described mechanism for twisted layer formation was first revealed through direct observation of CVD growth that initiated under controlled conditions inside the chamber of a modified environmental scanning electron microscope (ESEM) 16 . (researchsquare.com)
  • HeRX is a mechanism of concern since it can lead to abnormal grain growth in superalloys, however the mechanism also hold's promise for alternative processing methods resulting in recrystallization. (ufl.edu)
  • Pexidartinib , a drug taken by mouth, is used to diminish the tumor's growth, but only if symptoms are severe and not relieved by surgery. (msdmanuals.com)
  • If symptoms are severe, the loose bodies are removed along with the abnormal synovium. (msdmanuals.com)
  • Abnormal grain growth is often recorded as an undesirable phenomenon occurring during the sintering of ceramic materials as rapidly growing grains may lower the hardness of the bulk material through Hall Petch type effects. (wikipedia.org)
  • Abnormal grain growth (AGG) is encountered in metallic or ceramic systems exhibiting one or more of several characteristics. (wikipedia.org)
  • Taken together, these results suggest a correlation between the putative iGluR-like channel function and the alteration of root growth and development in the Arabidopsis roots. (intechopen.com)
  • Primary care should be established for ongoing monitoring of growth and development, age-appropriate nutritional screening as well as ongoing counseling and nutrition education. (cdc.gov)
  • Reviewing the WASDE number that came out today - there has been a buildup of ending stock in the main grains, as prices are at or near 10 year lows reflective of such glut. (blogspot.com)
  • For example, high magnetic fields have been used to both suppress abnormal grain growth and engineer the grain boundary character distribution of polycrystals. (sbir.gov)
  • Multiple active glide plane domains have been found within single grains. (stanford.edu)
  • It is generally characterized by tighter growth rings, higher density and greater proportion of heartwood. (southernpine.com)
  • Overview of Bone Tumors Bone tumors are growths of abnormal cells in bones. (msdmanuals.com)
  • This growth harms the cartilage and bone around the joint. (msdmanuals.com)
  • Seeded growth is very popular in synthesizing three-dimensional (3D) single crystals: 3D crystals are always grown into the same shapes, just as salts are invariably cubic single crystals. (unist.ac.kr)