Microstructure evolution within adiabatic shear band in peak aged ZK60 magnesium alloy

被引：54
作者：
Jiang, Lihong [1 ,2 ]
Yang, Yang [1 ,3 ,4 ]
Wang, Zhen [2 ]
Hu, Haibo [2 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] Nanchang Hangkong Univ, Sch Aeronaut Mfg Engn, Nanchang 330063, Jiangxi, Peoples R China
[3] Cent S Univ, Key Lab, Minist Educ Nonferrous Met Mat Sci & Engn, Changsha 410083, Peoples R China
[4] China Acad Engn Phys, Inst Fluid Phys, Mianyang 621900, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 711卷
基金：
中国国家自然科学基金;
关键词：
Adiabatic shear band; Rotational dynamic recrystallization; Dissolution of the precipitates; ZK60 magnesium alloy; HIGH-STRAIN; DYNAMIC RECRYSTALLIZATION; CARBIDE DISSOLUTION; MOLECULAR-DYNAMICS; HEAT-TREATMENT; LOCALIZATION; DEFORMATION; PRECIPITATION; DISLOCATION; DIFFUSION;
D O I：
10.1016/j.msea.2017.10.111
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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 104 s(-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 ultrafme 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.
引用
收藏
页码：317 / 324
页数：8
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