基于施密特因子计算分析拉伸孪晶对镁合金变形的影响

张钰婷; 宋广胜; 郝志菲; 刘亚楠; 高雪莹

doi:10.15980/j.tzzz.2017.10.028

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基于施密特因子计算分析拉伸孪晶对镁合金变形的影响
Effects of Extension Twin on Plastic Deformation of Mg Alloy Based on Schmid Factor Calculation
2017年37卷第10期页码：1146-1150
纸质出版日期： 2017 ，
DOI： 10.15980/j.tzzz.2017.10.028

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[1]张钰婷,宋广胜,郝志菲,刘亚楠,高雪莹.基于施密特因子计算分析拉伸孪晶对镁合金变形的影响[J].特种铸造及有色合金,2017,37(10):1146-1150.

Zhang Yuting, Song Guangsheng, Hao Zhifei, et al. Effects of Extension Twin on Plastic Deformation of Mg Alloy Based on Schmid Factor Calculation[J]. Special Casting & Nonferrous Alloys, 2017,37(10):1146-1150.
[1]张钰婷,宋广胜,郝志菲,刘亚楠,高雪莹.基于施密特因子计算分析拉伸孪晶对镁合金变形的影响[J].特种铸造及有色合金,2017,37(10):1146-1150. DOI： 10.15980/j.tzzz.2017.10.028.

Zhang Yuting, Song Guangsheng, Hao Zhifei, et al. Effects of Extension Twin on Plastic Deformation of Mg Alloy Based on Schmid Factor Calculation[J]. Special Casting & Nonferrous Alloys, 2017,37(10):1146-1150. DOI： 10.15980/j.tzzz.2017.10.028.

摘要

采用电子背散射技术（EBSD）对镁合金在100℃下的压缩变形过程中的晶粒取向变化进行了原位跟踪

对变形过程的滑移系和孪晶开动进行了定量分析。基于对不同滑移系的施密特因子（SF）在拉伸孪晶启动前后变化的计算

分析了拉伸孪晶启动对后续变形过程中滑移系开动的影响。结果表明

在拉伸孪晶启动前后

具有基面织构取向晶粒的基面滑移系施密特因子无明显变化

而柱面滑移系的施密特因子在孪晶后则大幅度降低

在随后的变形中不易启动

同时

锥面滑移系的施密特因子在孪晶后大幅增加

因此在随后的变形中相对容易启动。

Abstract

The orientation evolution of Mg alloy grains was in-situ tracked during compression at 100℃ by the electron backscatter diffraction（EBSD）method

meanwhile

quantitative analysis was also conducted on activations of slips and twinning.Effects of extension twin activation on slips activations were analyzed during deformation based on calculation of variations of Schmid factor（SF）for different slips before and after twinning.The results reveal that there are absence of distinct changes for Schmid factor of basal slips before and after twinning for Mg alloy grains with basal textured orientation

while the Schmid factor of prismatic slips is decreased distinctly after twinning and it is difficult to be activated during the subsequent deformation.In addition

the Schmid factor of pyramidal slips is increased distinctly after twinning

and it is relatively easy to be activated during the subsequent deformation.