Experimental and numerical investigation of anisotropic and twinning behavior in Mg alloy under uniaxial tension
Experimental and numerical investigation of anisotropic and twinning behavior in Mg alloy under uniaxial tension
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单轴拉伸下镁合金各向异性和孪生行为的实验和数值研究
DOI：
10.1016/j.matdes.2016.03.045
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发表时间：
2016-05
期刊：
影响因子：
--
通讯作者：
Mao Xianbiao
中科院分区：
文献类型：
--
作者：
Guo Xiaoqian;Chapuis Adrien;Wu Peidong;Liu Qing;Mao Xianbiao
镁合金板的面内拉伸由棱柱滑移和基底滑移调节，而当晶粒沿轴向沿着伸长时，{10 − 12}孪晶被激活< c >。用具有强基面织构的轧制厚板研究了Mg-3Al-1 Zn合金的拉伸塑性行为。拉伸试验沿着分布在法向和横向之间的五个方向进行，允许发生不同量的{10-12}孪晶、基底和棱柱滑移。利用EBSD测量和EVPSC模型研究了孪晶行为，并进行了Schmid因子分析。观察到的施密德因子的高排名的变体的量高于预测，强调应变之间的住宿晶粒和双胞胎的必要性。与压缩相比，即使当孪生活动是低的，更多的{10-12}孪生变体预测在拉伸。本研究证实了拉伸孪晶是镁合金在所有拉伸方向上的主要变形机制，也是通过孪晶-孪晶边界强化镁合金的有效途径。
In plane tension of magnesium alloy sheets is accommodated by prismatic and basal slip, whereas {10 − 12} twinning is activated when grains are elongated along the < c > axis. The plastic behavior of Mg-3Al-1Zn in tension has been investigated using a thick rolled plate with a strong basal texture. Tensile tests were performed along five directions distributed between the normal direction and the transverse direction, allowing various amount of {10–12} twinning, basal, and prismatic slip to take place. The twinning behavior has been investigated using EBSD measurement and EVPSC modeling, and Schmid factor analysis was performed. The observed amount of variants with a Schmid factor of high rank is higher than predicted, emphasizing the necessity of strain accommodation between grains and twins. Compared with compression, even when twinning activity is low, more {10–12} twin variants are predicted in tension. This study confirms extension twinning as a major deformation mechanism in all tensile directions and an efficient way to harden Mg alloys by twin-twin boundaries.
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