期刊
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
卷 24, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0965-0393/24/3/035010
关键词
ultrafine-grained metals; yield phenomena; Bauschinger effect; dislocation density; atomistic simulations
资金
- Ministry of Education, Culture, Sports, Science and Technology
The effect of the dislocation density on yield strength and subsequent plastic deformation of ultrafine-grained metals was investigated in large-scale atomistic simulations. Polycrystalline models were constructed and uniaxial tension and compression were applied to elucidate the heterogeneous plastic deformation and the Bauschinger effect. The initial yield becomes heterogeneous as the dislocation density decreases owing to a wide range of Schmid factors of activated slip systems in each grain. A different mechanism of the Bauschinger effect was proposed, where the Bauschinger effect of ultrafine-grained metals is caused by the change in dislocation density in the process of forward and backward loadings.
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