A composite model of the plastic flow of amorphous covalent materials |
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Authors: | M Yu Gutkin and I A Ovid’ko |
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Institution: | (1) Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, TamilNadu, 608002, India |
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Abstract: | A model based on the data available in the literature on the computer simulation of amorphous silicon has been proposed for
describing the specific features of the plastic flow of amorphous covalent materials. The mechanism of plastic deformation
involves homogeneous nucleation and growth of inclusions of a liquidlike phase under external shear stress. Such inclusions
experience plastic shear, which is modeled by glide dislocation loops. The energy changes associated with the nucleation of
these inclusions at room and increased temperatures have been calculated. The critical stress has been found, at which the
barrierless nucleation of inclusions becomes possible. It has been shown that this stress decreases with an increase in temperature.
According to the calculations, the heterogeneous (homogeneous) plastic flow of an amorphous material should be expected at
relatively low (high) temperatures. Above the critical stress, the homogeneous flow is gradually replaced by the heterogeneous
flow. |
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Keywords: | |
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