An examination of adiabatic shearing behavior in ZK60 alloy with different states of heat treatment
An examination of adiabatic shearing behavior in ZK60 alloy with different states of heat treatment
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不同热处理状态ZK60合金绝热剪切行为的研究
DOI：
10.1016/j.msea.2016.12.117
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发表时间：
2017-02
期刊：
影响因子：
--
通讯作者：
Zhen Wang
中科院分区：
文献类型：
--
作者：
Yang Yang;Lihong Jiang;Zhen Xu;Zhen Wang
采用厚壁圆筒径向压缩的方法研究了ZK60镁合金的绝热剪切行为和断裂。在固溶态（T4）、挤压态（T5）和固溶+时效态（T6）条件下测试合金的绝热剪切行为。结果表明，由于观察到的绝热剪切带的数量和相应的平均长度，该合金是不太容易形成绝热剪切带（ASB）的T4条件下。在T5条件下，合金更容易形成绝热剪切带，在有效应变为0.72和0.95时，分别观察到39和41条剪切带。然而，与所有其他热处理条件相比，在T6条件下观察到的剪切带更长。在T4、T5和T6状态下，ASB的宽度分别为3.8 µm、8.56 µm和8.62 µm。结果表明，在不同的条件下，合金提供了广泛的显微组织参数和力学性能。结果表明，ZK60镁合金在不同的热处理条件下，其显微组织参数（晶粒尺寸、析出相）和力学性能对绝热剪切行为有很大的影响。结果表明，在高应变率加载条件下，ASB是一种损伤断裂模式，裂纹在ASB边缘形核，沿剪切方向沿着扩展。
Adiabatic shearing behavior and fracture were investigated in ZK60 magnesium alloy by means of radial collapse of a thick-walled cylinder. The alloy was tested in the solid solution (T4), as-extruded (T5) and solid solution plus aged (T6) conditions to examine adiabatic shearing behavior. Results showed that the alloy was less susceptible to the formation of Adiabatic Shear Bands (ASBs) under the T4 condition due to the number of observed adiabatic shear bands and their corresponding average lengths. On the other hand, the alloy under the T5 condition was more susceptible to the formation of adiabatic shear bands with 39 and 41 shear bands observed under effective strains of 0.72 and 0.95 respectively. Nevertheless, the shear bands observed in the T6 condition were longer compared to all the other heat treated conditions. The widths of the ASBs are 3.8 µm, 8.56 µm and 8.62 µm at the T4, T5 and T6 states respectively. It was shown that the alloy under the different conditions provide a wide range of microstructural parameters and mechanical properties. It was shown that the ZK60 magnesium alloy under the different conditions provide a wide range of microstructural parameters (grain size, precipitates) and mechanical properties that affect its adiabatic shearing behavior. It is concluded that ASB is one of the damage fracture models under this kind of high strain rate loading where cracks nucleated on the edge of the ASBs and propagated along the shear direction.
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