Grain boundaries 意味
WebMay 1, 2000 · The grain boundary of (334) Σ17b is shown to be a plane matching boundary which is regarded as one of the low energy boundaries. Interface dislocations to assure the coherency at the boundary are ... WebConsider a second phase of β precipitates out of the matrix, α. It usually occurs at grain boundaries, which act as the nucleation sites facilitating the phase transformation. The potential sites for nucleation include: 1.) Grain facets (two grain junctions - faces) 2.) Grain edges (three grain junction lines) 3.) Grain corners (four grain -
Grain boundaries 意味
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WebApr 11, 2024 · T. Watanabe, “ An approach to grain boundary design for strong and ductile polycrystals,” Res. Mech. 11(1), 47– 84 (1984). The GB-related properties of materials can be enhanced by exercising control over the population of low Σ (Σ ≤ 29), the coincident site lattice (CSL) GB, 27 27. S. WebAl aided TbH2 grain boundary diffusion (GBD) was applied to sintered Nd-Fe-B magnet in comparison with the TbH2 GBD magnet. The coercivity was enhanced from 13.73 kOe to 23.29 kOe, higher than the 22.26 kOe of TbH2 GBD magnet. The Tb content in the bulk magnet was reduced to 0.47 wt%, much lower than the 1.85 wt% of the TbH2 GBD magnet.
WebThe boundary between one grain and its neighbour (grain boundary) is a defect in the crystal structure and so it is associated with a certain amount of energy. As a result, … Web彭海燕，康志新，李小珍，周莉，龙雁球磨时间对NbMoTaWVCr难熔高熵合金组织与性能的影响彭海燕1, 2，康志新2, 3，李小珍2，周莉
WebThe grain boundary is not flat (not on one plane), but arbitrarily bent. The grain boundary contains (atomic) steps and other local "grain boundary defects". The grain boundary contains foreign atoms or even … WebSep 30, 2024 · A grain boundary (GB) is the interface between two grains, or crystallites, in a polycrystalline material. Grain boundaries are defects in the crystal structure, and …
WebFig. 4.1. A grain boundary between two crystals misoriented by an angle about an axis normal to the page. 92 Recrystallization. experimentally (§A2.6.3), and in many cases, we neglect it and consider only the three parameters which define the orientation between the two grains adjacent to a boundary.
WebSep 16, 2024 · The length of CSL boundaries and non CSL high angle boundaries is determined using EBSD, and the multiplied with the respective energy values to get an overall grain boundary energy for the ... grange white hallWebGrain boundary misorientation angles and stress-induced voiding in.pdf. 2012-04-29上传. Grain boundary misorientation angles and stress-induced voiding in ching hookWebThe grain size of a UNCD film determines the sp 2 and hydrogen content. It follows that smaller grains result in higher grain-boundary (GB) areas, which in turn leads to higher … grange white cityWebHigh and Low Angle Boundaries. It is convenient to separate grain boundaries by the extent of the mis-orientation between the two grains. Low angle grain boundaries (LAGBs) are those with a misorientation less than about 11 degrees. Generally speaking they are composed of an array of dislocations and their properties and structure are a function of … grange whiskeyWebEvidence that diffusion itself can induce boundary migration is reviewed. Experiments documenting this fact using zinc-iron alloys are discussed. The relationship of grain boundaries with bulk composition change due to boundary migration is examined. 展开 grange white hall bloomsburyWebOct 23, 2024 · Grain boundary and point defect scattering have two distinct effects: they both reduce the absolute value of κ Lat and its temperature dependence, as illustrated in Fig. 6(b). ching howe chanWebApr 5, 2002 · Grain boundaries often hinder their transmission, creating a dislocation pile-up at the boundary and thereby making the material harder to deform. One of the best known theories based on dislocation pile-up, described by the Hall-Petch equation ( 2, 3 ), predicts the hardness of the material to be inversely proportional to the square root of ... grange white hall hotel address