نتایج جستجو برای: dislocations
تعداد نتایج: 14284 فیلتر نتایج به سال:
A part of the theory of dislocations in crystals is revised with the aim to fit it into the framework of the nonlinear theory of plasticity initially designed for amorphous glassy materials. Dislocations provide a microscopic mechanism explaining the plasticity of crystals. The idea of dislocations suggested by Taylor and Orowan in 1934 is illustrated on the first two figures. Fig. 1.1 and Fig....
We examined the thermodynamic and kinetic properties of surface dislocations on the Au 001 surface using atomistic simulations based on a modified embedded atom potential that was optimized for Au surfaces. Two different surface dislocations are obtained, containing five displaced atomic columns type I or three displaced atomic columns type II . Both configurations are more stable than adatoms ...
We combine two scanning electron microscopy techniques to investigate the influence of dislocations on the light emission from nitride semiconductors. Combining electron channeling contrast imaging and cathodoluminescence imaging enables both the structural and luminescence properties of a sample to be investigated without structural damage to the sample. The electron channeling contrast image ...
Two types of equilibrium core structures ~denoted symmetric and asymmetric! for 1/2a^111& screw dislocations in bcc metals have been found in atomistic simulations. In asymmetric ~or polarized! cores, the central three atoms simultaneously translate along the Burgers vector direction. This collective displacement of core atoms is called polarization. In contrast, symmetric ~nonpolarized! cores ...
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