Twinning, grain orientation, and texture variations in Mg alloy processed by pre-rolling
Twinning, grain orientation, and texture variations in Mg alloy processed by pre-rolling
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预轧镁合金的孪晶、晶粒取向和织构变化
DOI：
10.1016/j.pnsc.2019.03.008
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发表时间：
2019-04
期刊：
影响因子：
--
通讯作者：
Pan Fusheng
中科院分区：
文献类型：
--
作者：
Yang Qingshan;Dai Qingwei;Lou Chao;Dai Jiahong;Zhang Jianyue;Jiang Bin;Pan Fusheng
在室温下对无基面织构和基面织构的AZ 61镁合金沿横向（TD）和挤压方向（艾德）施加沿着小预应变的预轧（PR）工艺，研究其诱导孪生行为。合金的显微组织演变被用来评估晶界效应的织构变化。结果表明，PR工艺引入了{10 1 <$2}延伸孪晶，且孪晶的体积分数随减薄量的增加而增加。通过孪生导致的晶粒再取向的晶粒细分，产生了一个突出的与C轴平行的法线方向（ND）后PR的基础织构。具有这种C轴//TD功能的织构镁合金可以促进孪生活动。孪晶性能是引发塑性变形的关键，因此可以确定室温下的变形行为。并讨论了与拉伸孪晶有关的变形机制。
A pre-rolling (PR) process with a small pre-strain was applied along the transverse direction (TD) and the extrusion direction (ED) of non-basal and basal textured AZ61 Mg alloys at room temperature to investigate the induced twinning behavior. The microstructural evolution of the alloys was used to evaluate the grain-boundary effect in terms of the texture variation. The results demonstrated that {10 1¯ 2} extension twinning was introduced by the PR process and that the volume fraction of twins increased with increasing thickness reduction. The subdivision of grains via twinning induced grain reorientation that generated a prominent basal texture with the c-axis parallel to the normal direction (ND) after PR. The textured Mg alloy with this c-axis//TD feature can promote twinning activity. The twinning performance was critical to initiate plastic deformation, therefore to determine deformation behavior at room temperature. The deformation mechanism was also addressed related to the extension twin lamellae.
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