Microstructure evolution within adiabatic shear band in peak aged ZK60 magnesium alloy
Microstructure evolution within adiabatic shear band in peak aged ZK60 magnesium alloy
复制标题
峰值时效 ZK60 镁合金绝热剪切带内的微观结构演化
DOI：
10.1016/j.msea.2017.10.111
复制
发表时间：
2018-01
期刊：
影响因子：
--
通讯作者：
Haibo Hu
中科院分区：
文献类型：
--
作者：
Lihong Jiang;Yang Yang;Zhen Wang;Haibo Hu
系统研究了峰值时效ZK60镁合金圆筒试件爆炸径向压缩后绝热剪切带(ASB)的组织演变。利用厚壁圆筒径向坍塌技术进行了高应变率压缩试验，其名义应变率约为104s−1。透射电子显微镜结果表明，剪切带边界的主要特征是细长的晶粒和变形的孪晶。发现ASB的中心区域由超细等轴晶组成，典型的尺寸为100 nm。研究发现，在绝热剪切过程中，ASB内部的析出物显著减少，即析出物瞬间溶解。认为ASB内部细小的等轴晶是局域化过程中旋转动态再结晶的结果。析出物与基质之间的自由能差为析出物的溶解提供了热力学条件。由于高应变率、高剪应力(大应变)和绝热温升，导致析出相瞬间溶解，导致扩散速率增加。
Microstructure evolution in adiabatic shear band (ASB) in the peak aged ZK60 magnesium alloy cylindrical tube specimen after explosive radial compression was systematically investigated. High strain rate compression tests were performed by means of the radial collapse of thick-walled cylinder technique to achieve nominal strain rates of about 104s−1. The TEM results indicate that the elongated grains and deformed twins are the major characteristics in the boundary of the shear band. The central region in ASB was found to consists of ultrafine and equiaxed grains with a typical size of 100 nm. And it was found that precipitates within ASB were significantly reduced, namely the precipitates instantaneous dissolution during adiabatic shearing. It is proposed that fine equiaxed grains within ASB are the result of rotational dynamic recrystallization during localization. The free energy difference between the precipitates and matrix provided a thermodynamic condition for the dissolution of precipitates. Diffusion rate increased due to high strain rate, high shear stress (large strain) and adiabatic temperature rise, which caused instantaneous dissolution of precipitates.
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