Inducing superplasticity in extruded pure Mg by Zr addition
Inducing superplasticity in extruded pure Mg by Zr addition
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DOI：
10.1016/j.msea.2019.138502
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发表时间：
2020-01
期刊：
影响因子：
6.4
通讯作者：
F. Sayari;R. Mahmudi;R. Roumina
中科院分区：
文献类型：
--
作者：
F. Sayari;R. Mahmudi;R. Roumina
在纯Mg的基础上添加0.7 wt% Zr，形成了由粗晶粒和细晶粒组成的双峰组织，平均晶粒尺寸为2.8 μm，挤压后形成了大量的高角度晶界。剪切冲孔试验（SPT）在673 K下获得的最大应变率敏感性指数为0.42，活化能为96 kJ mol - 1，表明晶界扩散控制的晶界滑动是超塑性过程的主要机制。
Addition of 0.7 wt% Zr to pure Mg resulted in a bimodal structure, consisting of both coarse and fine recrystallized grains with a mean grain size of 2.8 μm, and a large fraction of high angle grain boundaries after extrusion. A maximum strain rate sensitivity index of 0.42, obtained by shear punch test (SPT) at 673 K, together with activation energy of 96 kJ mol–1indicated that grain boundary sliding controlled by grain boundary diffusion is the dominant mechanism in superplastic regime.