AZ31镁合金在以孪生主导的塑性变形中力学行为的模拟（英文）

发布时间：2018-02-13 16:37

本文关键词： AZ镁合金孪生晶体塑性塑性变形　出处：《Transactions of Nonferrous Metals Society of China》2015年11期 　论文类型：期刊论文

【摘要】：从实验和黏塑性自洽(VPSC)模拟两个方面定量分析具有织构的AZ31镁合金中孪晶数量及其与应力-应变曲线的关系。沿着两个不同的方向进行压缩以启动{1012}拉伸或者{1011}压缩孪生。{1012}拉伸孪晶在塑性变形的初始阶段形核并且长大到完全吞并母体。当沿着法向压缩时,{1011}孪生和{1011}-{1012}二次孪生在应变量为0.05时开始启动,并且这些孪晶的数量一直增加直到材料断裂,即应变量大于0.15。当沿着横向压缩应变量为0.06时,也会启动{1011}孪生和{1011}-{1012}二次孪生,然后在已经完全发生{1012}孪生的晶粒中大量启动。应用适当的参数,VPSC模型可以准确地判断拉伸孪晶、压缩孪晶和二次孪晶的启动和流动应力以及变形织构。从模拟中可以看出,孪生和滑移具有相同的硬化参数。
[Abstract]:Quantitative analysis of the number of twins in textured AZ31 magnesium alloys and their relationship with stress-strain curves were carried out in terms of experiments and visco-plastic self-consistent VPC simulation. Compression in two different directions was carried out to start {1012} tensile or {1011}. Compression twinning. {1012} tensile twins nucleate at the initial stage of plastic deformation and grow to fully engulf the parent body. When normal compression is followed, {1011} twinning and {1011}-{1012} twinning start when the strain is 0.05. And the number of these twins increases until the material breaks, that is, the strain is greater than 0.15.When the strain is 0.06 along the transverse compression, the {1011} twins and {1011}-{1012} secondary twins are also activated. Then a large number of starters are started in the grains where {1012} twins have completely occurred. The starting and flow stresses and deformation textures of tensile twins, compression twins and secondary twins can be accurately determined by using the appropriate parameters of the VPSC model. It can be seen from the simulation that, Twinning and slip have the same hardening parameters.
【作者单位】：重庆大学材料科学与工程学院;
【基金】：Project(2013CB632204)supported by the National Basic Research Program of China Project(51350110332)supported by the National Natural Science Foundation of China
【分类号】：TG146.22

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