The effect of twinning and detwinning on the mechanical property of AZ31 extruded magnesium alloy during strain-path changes
The effect of twinning and detwinning on the mechanical property of AZ31 extruded magnesium alloy during strain-path changes
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DOI：
10.1016/j.matdes.2014.05.056
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发表时间：
2014-11
影响因子：
8.4
通讯作者：
Lifei Wang;Guangsheng Huang;Quan Quan-Quan;P. Bassani;E. Mostaed;M. Vedani;F. Pan
中科院分区：
文献类型：
--
作者：
Lifei Wang;Guangsheng Huang;Quan Quan-Quan;P. Bassani;E. Mostaed;M. Vedani;F. Pan
为了研究孪生-失孪生对AZ31挤压镁合金力学性能的影响，在1%、3%、5%应变水平下沿挤压方向（ED）进行了预压缩和预拉伸变形。预应变后，在室温下进行拉伸或压缩试验，逆转应变路径。结果表明，预压缩后的反拉伸过程中出现了脱孪生行为。虽然由于上述影响，拉伸屈服强度下降，但通过增加预压水平，断裂伸长率和峰值强度都有所提高。在预拉伸后的反压试验中，{10−1 2}孪晶受到抑制，孪晶的体积分数降低，从而通过增加预拉伸水平来提高屈服强度。
In order to investigate the effect of twinning–detwinning on the mechanical properties of AZ31 extruded magnesium alloy pre-compression and pre-stretch deformation were conducted along extrusion direction (ED) at 1%, 3%, 5% strain levels. After pre-strain, the strain-path was inverted by performing tensile or compressive tests at room temperature. Results showed that the detwinning behavior occurred during the inverse tension after the pre-compression. Although due to the aforementioned effect the tensile yield strength decreased, by increasing the pre-compressive levels both fracture elongation and peak strength improved. In the inverse compressive tests after pre-stretch the {1 0 −1 2} twinning was restrained and the volume fraction of twins decreased, leading to the improvement of yield strength by increasing in pre-stretching levels.