施密特因子分布图预测锆的变形行为

Schmid factor maps to predict slip and twinning behaviours in Zirconium

摘要:

由拉伸应力方向与c轴夹角及拉伸应力方向在基面投影与基面a轴夹角为自变量绘制了锆及锆合金中不同变形方式的施密特因子分布图并做了系统分析和研究。变形方式包括基面滑移，柱面滑移和锥面滑移等三组和滑移系和{10-12}, {11-21}, {11-22} 和 {10-11}四组孪晶系。每个独立变形方式下的软取向和硬取向被确定。施密特因子分布图结合实验中每种变形方式的临界剪切应力可以有效预测每种变形方式的相对活性并能够很好地吻合现有的实验结果。

Abstract:

A series of Schmid factor (SF) maps for different slip and twinning modes in Zirconium were systematically calculated and comprehensively illustrated as a function of the tensile angle between the applied stress and the c-axis together with the projective angle on the basal plane. The deformation modes include three groups of slip systems, i.e. basal, prismatic, pyramidal and slips and four groups of twinning systems, i.e.{10-12}, {11-21}, {11-22} and {10-11}. The “soft” and “hard” orientation zones were determined in terms of individual plastic deformation modes. A variant selection criterion for slip and twinning of Zirconium is proposed. The plastic deformation mechanisms are interpreted based on the Schmid factor maps in combination with the experimental data on the critical resolved shear stress (CRSS) for different deformation modes. The predicted plastic deformation mechanisms are consistent with the existing experimental results.