分子動力学法によるナノ多結晶体の変形・局所くびれ解析(ナノ多結晶体の粒内変形と粒間変形の関係)

概要

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We examine the deformation and localized necking mechanism of round bar specimen of nanocrystalline materials by molecular dynamics simulation, and consider the relationship between the intergranular deformation and the intragranular deformation of nanocrystalline materials. We use two atomic interaction potentials which show different values of stacking fault energy. In the case of high stacking fault energy, the model is deformed by mainly the inter-granular deformation; grain boundary sliding, and a little intragranular deformation; crystal slips by the movement of perfect dislocation, but in contrast, in the case of low stacking fault energy, the deformation is caused by the intra-granular deformation by the movement of partial dislocation that leaves stacking fault plane in grains. Because stacking fault planes in grains prevent the activation of other slip systems, a kind of work hardening-like effect is observed.
社団法人日本材料学会の論文
2005-04-15