Evolution of precipitates in ZK60 magnesium alloy during high strain rate deformation

被引：45
作者：
Yang, Yang [1 ,2 ,3 ]
Wang, Zhen [1 ]
Jiang, Lihong [1 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Key Lab, Minist Educ Nonferrous Met Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[3] China Acad Engn Phys, Inst Fluid Phys, Mianyang 621900, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 705卷
基金：
中国国家自然科学基金;
关键词：
High strain rate; Precipitates; TEM; ZK60 magnesium alloy; MG-ZN ALLOY; SELF-ORGANIZATION; ALUMINUM-ALLOY; HEAT-TREATMENT; SHEAR BANDS; MICROSTRUCTURE; BEHAVIOR; STEEL; STABILITY; TORSION;
D O I：
10.1016/j.jallcom.2017.02.158
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
High strain rate(6.2 x 10(4) s(-1)) loading of ZK60 magnesium alloy was carried out with radial collapse of a thick-walled cylinder technology. The evolution of precipitates in solution-treated and peak-aged ZK60 magnesium alloy during high strain rate deformation was studied by transmission electron microscopy (TEM) for the first time. A large number of elongated rod-like phase were precipitated in solution-treated sample after impacting; the rod-like phases in peak-aged sample experienced shortening and thinning, and some of which finally transformed into spherical-like phases, namely the rod-like phases were preliminarily dissolved into the matrix. Based on thermodynamics and kinetics analyses, the high strain rate, high density dislocation, high shear stress and adiabatic temperature rise induced by explosive impact process make it possible for precipitates to precipitate and dissolve preliminarily within about 3.1 mu s. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：566 / 571
页数：6
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