Evolution of dislocation and twin densities in a Mg alloy at quasi-static and high strain rates

被引:102
作者
Wang, M. [1 ]
Xu, X. Y. [1 ]
Wang, H. Y. [2 ,3 ]
He, L. H. [4 ,5 ]
Huang, M. X. [1 ]
机构
[1] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China
[2] Jilin Univ, State Key Lab Automot Simulat & Control, Nanling Campus,5988 Renmin St, Changchun 130025, Peoples R China
[3] Jilin Univ, Sch Mat Sci & Engn, Nanling Campus,5988 Renmin St, Changchun 130025, Peoples R China
[4] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[5] Spallat Neutron Source Sci Ctr, Dongguan 523803, Peoples R China
基金
中国国家自然科学基金;
关键词
Mg alloys; strain rate; twinning; dislocation density; Hopkinson tensile bar; X-RAY-DIFFRACTION; MAGNESIUM ALLOY; DEFORMATION-BEHAVIOR; MICROSTRUCTURAL EVOLUTION; POLYCRYSTALLINE MAGNESIUM; DYNAMIC DEFORMATION; MECHANICAL-BEHAVIOR; PROFILE ANALYSIS; CONTRAST FACTORS; PLASTIC STRAIN;
D O I
10.1016/j.actamat.2020.09.082
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The present work, for the first time, quantitatively studies the evolution of both dislocations and deformation twins with various strain rates in an ATZ311 Mg alloy. Interrupted tensile tests were performed at the strain rates of 0.001, 1 and 600 s(-1). Deformation twins were characterized by microscopy techniques and evaluated using the fractions of twin boundaries and twinned area. The average dislocation density and the relative fractions of dislocations with different Burgers vectors were determined from neutron diffraction data. It was found that the twin fraction increases remarkably and becomes saturated at lower strain rates (0.001-1 s(-1)), while the dislocation density only obtains an obvious enhancement at a much higher strain rate (600 s(-1)). Besides, the distinctively high flow stress at high strain rate leads to a substantial increase in the density of the hard-to-activate < c + a >-type dislocations, after the < a >-type dislocation density reaches rapidly its saturated value at a small strain level. The twinning modes with opposite polarities are able to coexist in the same grains because of the high local stress concentration at strain rates above 1 s(-1). (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:102 / 113
页数:12
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