面心立方金属平面变形的屈服应力状态分析
来源期刊：中南大学学报(自然科学版)2000年第4期
论文作者：陈志永 张新明 刘楚明 周卓平
文章页码：330 - 334
关键词：孪生;滑移;平面变形;屈服应力
Key words：twinning; slip; plane deformation; yield stress
摘 要：将fcc金属滑移和孪生2种机制综合起来进行考虑,应用Bishop-Hill最大功原理,计算和分析了临界剪切应力之比ζ不同时各理想取向平面共生变形时的屈服应力状态、相应活化系及Taylor因子M.结果表明:当ζ>1/ 3时,随着ζ的减小,C,G,RCu3种取向时的M值不变,共同的活化系均为滑移系,不易孪生;其它取向的M值越来越小,共同的活化系均包括滑移系和孪生系,具有孪生倾向.ξ取不同值时,最强和最弱的M值的取向位置均没有改变,分别位于RG取向处和C,G取向处.
Abstract: The Bishop-Hill maximum principle is applied to fcc metals for twinning and slip under plane deformation. The yield stress states, corresponding active systems and Taylor factors Mformain ideal orientations have been calculated and analyzed when the ratios of critical shear stresses are different. The results show that when ζ>1/ 3, for C, G, RCu orientations, theMvalues remain unchanged asζdecreases and twinning is difficultsince all common active systems are slip systems; for the other orientations, theMvalues become less and less and the common active systems include slip and twinning systems, which have the trend of twinning. When ζ varies, the orientations for the strongest and weakest M do not change, they are located in RG and C, Gorientations respectively.
