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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 10    No. 1    February 2000

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Yield surfaces of fcc crystals with crystallographic slip and mechanical twinning①
CHEN Zhi-yong(陈志永), ZHANG Xin-ming(张新明), ZHOU Zhuo-ping(周卓平),LIU Chu-ming(刘楚明), LI Sai-yi(李赛毅), Yang Yang(杨 扬)

Department of Materials Science and Engineering, Central South University of Technology, Changsha 410083, P.R.China

Abstract:The mixed yield surfaces of fcc single crystals for slip on {111}〈110〉and mechanical twinning on {111} 〈112〉systems have been derived when their critical resolved shear stresses are equal. It has been found that there are 259 stress states that can be classified into 21 groups according to the crystal symmetry. Each group activates 5, 6 or 8 slip or/ and twinning systems depending on crystallographically non-equivalent slip or/and twinning systems groups. Among all
those stress states, 3 groups activate 8 systems, including 21 stress states; 9 groups activate 5 systems, including 70 ones; the remaining 9 groups activate 5 systems, including 168 ones.

 

Key words: yield surfaces; fcc metals; {111}〈110〉slip; {111}〈112〉mechanical twinning

ISSN 1672-7029
CN 43-1423/U

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