The effect of LPSO on the deformation mechanism of Mg–Gd–Y–Zn–Zr magnesium alloy
The effect of LPSO on the deformation mechanism of Mg–Gd–Y–Zn–Zr magnesium alloy
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DOI：
10.1016/j.jma.2016.03.001
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发表时间：
2016-06
影响因子：
17.6
通讯作者：
J. Shao;Zhiyong Chen;Tao Chen;Zhang Hu;Xiaojie Zhou;Chuming Liu
中科院分区：
文献类型：
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作者：
J. Shao;Zhiyong Chen;Tao Chen;Zhang Hu;Xiaojie Zhou;Chuming Liu
研究了Mg-4.7Gd-3.4Y-1.2Zn-0.5Zr（at.用电子背散射衍射（EBSD）和滑移线方法研究了具有长周期堆垛结构（LPSO）的镁合金的晶体结构。结果表明，在Schmid孪生因子较高的晶粒中，孪晶数量较少且尺寸很小，表明LPSO相阻止了{10-12}孪晶变形的长大。棱柱滑移施密德因子大于0.4的晶粒中存在棱柱线。有利的取向和LPSO相协同促进棱柱滑移的激活。变形过程中晶粒的不均匀旋转是晶界微裂纹产生的原因。
The tensile deformation behavior and corresponding microstructure evolution of the Mg-4.7Gd-3.4Y-1.2Zn-0.5Zr (at. %) magnesium alloy with long period stacking structure (LPSO) are studied by electron backscatter diffraction (EBSD) and slip lines methods. The results show that less and very small size of twins is observed in the grains with high value of Schmid factor for twinning, which indicates that the growth of the {10–12} twinning deformation is prevented by the LPSO phase. The prismatic lines present in grains of which the prismatic slip Schmid factor is above 0.4. The favorable orientation and LPSO phase synergistically promote the activation of prismatic slip. The inhomogeneous rotation of the grains during deformation is the reason for the microcrack at grain boundary.