Orientation dependence of deformation twinning in Cu single crystals
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第8期
论文作者：S.S.Cai X.W.Li N.R.Tao
文章页码：1364 - 1370
摘 要：Cu single crystals were subjected to dynamic compression plastic deformation to investigate orientationdependent twinning.The experimental results showed that twinning is closely related to the ratio of the maximum Schmid factor for twinning partial（mT）to the maximum Schmid factor for perfect dislocation（mS）,i.e.,mT/mS,rather than mT.The twin volume fraction VTincreases with the mT/mSvalue and the most favorable orientation for twinning has the maximum mT/mSvalue（1.15）.The relationships of mT/mSwith both effective stacking fault energy γeffand threshold stress for twinning τTwere established for understanding orientation-dependent twinning.Further insights into the orientation-dependent twinning and guidance for developing bulk high density nanotwinned materials are provided.
S.S.Cai1，X.W.Li2，N.R.Tao1
1. Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences2. Department of Materials Physics and Chemistry,School of Materials Science and Engineering,and Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education),Northeastern University
摘 要：Cu single crystals were subjected to dynamic compression plastic deformation to investigate orientationdependent twinning.The experimental results showed that twinning is closely related to the ratio of the maximum Schmid factor for twinning partial（mT）to the maximum Schmid factor for perfect dislocation（mS）,i.e.,mT/mS,rather than mT.The twin volume fraction VTincreases with the mT/mSvalue and the most favorable orientation for twinning has the maximum mT/mSvalue（1.15）.The relationships of mT/mSwith both effective stacking fault energy γeffand threshold stress for twinning τTwere established for understanding orientation-dependent twinning.Further insights into the orientation-dependent twinning and guidance for developing bulk high density nanotwinned materials are provided.
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