Orientation dependence of deformation twinning in Cu single crystals

Cu single crystals were subjected to dynamic compression plastic deformation to investigate orientation-dependent 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 di...

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Bibliographic Details
Published inJournal of materials science & technology Vol. 34; no. 8; pp. 1364 - 1370
Main Authors Cai, S.S., Li, X.W., Tao, N.R.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2018
Subjects
Orientation
Single crystal
Twinning
Cu
Twinning
Orientation
Single crystal
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Summary:Cu single crystals were subjected to dynamic compression plastic deformation to investigate orientation-dependent 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 VT increases with the mT/mS value and the most favorable orientation for twinning has the maximum mT/mS value (1.15). The relationships of mT/mS with both effective stacking fault energy γeff and threshold stress for twinning τT were established for understanding orientation-dependent twinning. Further insights into the orientation-dependent twinning and guidance for developing bulk high density nanotwinned materials are provided.
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2017.10.004