WebNational Center for Biotechnology Information WebJul 17, 2014 · For G1–3, the GB angle increased from 12.1° to 21.6°, while that for the G3–4 decreased from 35.1° to 27.7°. Here again, no intra-grain dislocations were observed inside these tiny grains...
Ways of describing grain boundaries and types of grain …
WebHigh-angle grain boundaries are associated with higher grain boundary energy and are generally thought to promote GBS. In this work grain boundaries are modeled as planar and bicrystalline structures specified by CSL models. WebThe grain-boundary cracks grew and became more extensive as the creep time and displacement increased. The cracks propagated both perpendicular and parallel to the loading direction, though the... bite squad - food delivery
Evaluation of grain boundaries as percolation pathways in
WebNov 7, 2024 · Nowadays, the tolerance of grain boundaries (GBs) is a crucial subject of single crystal (SX) superalloys. Quantitatively deciphering the effect of GBs on the interfacial stability may provide theoretical … In materials science, a grain boundary is the interface between two grains, or crystallites, in a polycrystalline material. Grain boundaries are two-dimensional defects in the crystal structure, and tend to decrease the electrical and thermal conductivity of the material. Most grain boundaries are preferred … See more It is convenient to categorize grain boundaries according to the extent of misorientation between the two grains. Low-angle grain boundaries (LAGB) or subgrain boundaries are those with a misorientation less … See more The energy of a low-angle boundary is dependent on the degree of misorientation between the neighbouring grains up to the transition to high-angle status. In the case of simple tilt boundaries the energy of a boundary made up of dislocations with Burgers vector b … See more The movement of grain boundaries (HAGB) has implications for recrystallization and grain growth while subgrain boundary (LAGB) movement strongly influences recovery and the nucleation of recrystallization. A boundary moves … See more Grain boundaries can cause failure mechanically by embrittlement through solute segregation (see Hinkley Point A nuclear power station) but they also can detrimentally affect … See more A boundary can be described by the orientation of the boundary to the two grains and the 3-D rotation required to bring the grains into coincidence. Thus a boundary has 5 macroscopic degrees of freedom. However, it is common to describe a … See more The excess volume is another important property in the characterization of grain boundaries. Excess volume was first proposed by Bishop in a private communication to Aaron and Bolling in 1972. It describes how much expansion is induced by the … See more Grain boundaries are the preferential site for segregation of impurities, which may form a thin layer with a different composition from the bulk. For example, a thin layer of silica, which also contains impurity cations, is often present in silicon nitride. These grain … See more WebThe grain boundary refers to the outside area of a grain that separates it from the other grains. The grain boundaries separate variously-oriented crystal regions (polycrystalline) in which the crystal structures are … bite splints