Webb100 〉 symmetric tilt grain-boundary energies to obtain more reliable defect energies. The determined finite-temperature behaviour was compared with the experimental results …

Grain boundary model used for the DFT calculations. A small angle grain …

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 … Visa mer 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 … Visa mer The excess volume is another important property in the characterization of grain boundaries. Excess volume was first proposed by Bishop … Visa mer 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 … Visa mer 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 … Visa mer The energy of a low-angle boundary is dependent on the degree of misorientation between the neighbouring grains up to the transition to high … Visa mer 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 … Visa mer Grain boundaries can cause failure mechanically by embrittlement through solute segregation (see Hinkley Point A nuclear power station) … Visa mer WebbUsually, when the rotation angle is small (~<15°) the grain boundary is composed of individual dislocations and the boundary is called is small angle grain boundary. When the angle is larger, the boundary structure is less well defined and … small sharp knife

arXiv:1009.4039v2 [math-ph] 18 Jun 2011

WebbSpectral properties of grain boundaries at small angles of rotation 201 In Section 6, finally, we first explain a simplified model for small angle grain boundaries where we assume … Webb1 sep. 1997 · @article{osti_540963, title = {High angle boundaries formed by grain subdivision mechanisms}, author = {Hughes, D A and Hansen, N}, abstractNote = … WebbSmall angle tilt and twist grain boundary A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Major Subject: Metallurgy strengthening in yttrium Thomas George Carnahan Approved: Graduate College Iowa State University Ames, Iowa 1971 Signature was redacted for … small sharp pain in head