Twinning and detwinning during compression–tension loading measured by quasi in situ electron backscatter diffraction tracing in Mg–3Al–Zn rolled sheet
Twinning and detwinning during compression–tension loading measured by quasi in situ electron backscatter diffraction tracing in Mg–3Al–Zn rolled sheet
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DOI：
10.1007/s12598-013-0209-8
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发表时间：
2015-10
期刊：
影响因子：
8.8
通讯作者：
Li Zheng;Shi-hong Zhang;D. Helm;Hong-wu Song;G. Song;Neng-yong Ye
中科院分区：
文献类型：
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作者：
Li Zheng;Shi-hong Zhang;D. Helm;Hong-wu Song;G. Song;Neng-yong Ye
孪晶和退孪晶是镁合金在室温循环载荷作用下的重要变形方式。为了分析这两种变形机制，对Mg-3Al-1 Zn轧制板材进行了沿着轧制方向的循环压缩-拉伸实验。利用准原位电子背散射衍射（EBSD）技术跟踪了一系列晶粒在变形过程中的组织演变。在测量的基础上，计算了孪生系统的Schmid因子、压缩过程中的孪生分数和反向加载后的孪生分数等重要量。分析了反向加载时孪晶变体的Schmid因子对退孪晶的影响。如果在反向加载之前在孪晶区中的孪晶的Schmid因子足够大，则去孪晶将优选在反向加载期间进行。
Twinning and detwinning are the important deformation modes in magnesium alloys during cyclic loading at room temperature. To analyze these two deformation mechanism, cyclic compression–tension experiments were performed on Mg–3Al–1Zn rolled sheet along the rolling direction. In these tests, the microstructure evolutions of a series of grains during deformation were traced by using quasi in situ electron backscatter diffraction (EBSD). Important quantities like the Schmid factors of twinning system, the fraction of twinning during compression, and the fraction of twinning after reverse loading were calculated on the basis of measured quantities. The influence of Schmid factor of twinning variants on detwinning upon reverse loading was analyzed. Detwinning would prefer to proceed during reverse loading if the Schmid factor of twinning in the twinning area before reverse loading is sufficiently large.