Microstructural evolution of single-crystal magnesium under elevated temperature and ultra-high strain rate

被引:7
作者
Wang, Shengtao [1 ]
Pan, Hao [1 ]
Wang, Pei [1 ]
Zhang, Fengguo [1 ]
机构
[1] Inst Appl Phys & Computat Math, Beijing 100094, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
PLASTIC-DEFORMATION; CONSTITUTIVE MODEL; DISLOCATION; SLIP; DYNAMICS; ALLOYS; PROPAGATION; TRANSITION; METALS; GROWTH;
D O I
10.1063/1.5086338
中图分类号
O59 [应用物理学];
学科分类号
摘要
Despite numerous studies of the deformation behavior of magnesium (Mg), its microstructural evolution at different temperatures and strain rates remains largely unexplored. In this paper, the evolution of dislocations and amorphous regions in single-crystal Mg under compressive loading along the c-axis is investigated using molecular dynamics simulations, and temperature and strain-rate dependence of the microstructural evolution is revealed. At a strain rate of 10(7)s(-1), the dislocations are low in density, and they slip and evolve unevenly as the strain in the single crystal increases. Consequently, the stress in the single crystal varies in a zigzag manner with increasing strain. The dislocation density is higher at strain rates of 10(8)s(-1) and 10(9)s(-1), resulting in relatively smooth deformation and stress-strain curves. At a strain rate of 10(10)s(-1), the amorphous regions achieve a very high fraction during deformation, contributing to softening and smoother deformation of the single crystal. The fraction of amorphous regions also increases with increasing temperature, which is an important cause of the temperature softening effect. Furthermore, the initiation of dislocations and amorphous regions is also studied at different strain rates and temperatures.
引用
收藏
页数:12
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