Grain size dependence of dynamic mechanical behavior of AZ31B magnesium alloy sheet under compressive shock loading

被引：45

作者：

Asgari, H. ^{[1
]}

Odeshi, A. G. ^{[1
]}

Szpunar, J. A. ^{[1
]}

Zeng, L. J. ^{[2
]}

Olsson, E. ^{[2
]}

机构：

[1] Univ Saskatchewan, Dept Mech Engn, Saskatoon, SK S7N 0W0, Canada

[2] Chalmers, Dept Appl Phys, S-41296 Gothenburg, Sweden

来源：

MATERIALS CHARACTERIZATION | 2015年 / 106卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

AZ31B magnesium alloy; Dynamic deformation mechanism; Twinning; Mechanical properties; STRAIN-HARDENING BEHAVIOR; MG ALLOY; MICROSTRUCTURAL EVOLUTION; MG-3AL-1ZN ALLOY; DEFORMATION MECHANISMS; TEXTURE EVOLUTION; ROOM-TEMPERATURE; YIELD ASYMMETRY; WIDE-RANGE; RATES;

D O I：

10.1016/j.matchar.2015.06.030

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of grain size on the dynamic deformation behavior of rolled AZ31B alloy at high strain rates were investigated. Rolled AZ31B alloy samples with grain sizes of 6,18 and 37 pm, were subjected to shock loading tests using Split Hopkinson Pressure Bar at room temperature and at a strain rate of 1100 s(-1) It was found that a double-peak basal texture formed in the shock loaded samples. The strength and ductility of the alloy under the high strain-rate compressive loading increased with decreasing grain size. However, twinning fraction and strain hardening rate were found to decrease with decreasing grain size. In addition, orientation imaging microscopy showed a higher contribution of double and contraction twins in the deformation process of the coarse-grained samples. Using transmission electron microscopy, pyramidal <c + a> dislocations were detected in the shock loaded sample, proving the activation of pyramidal <c + a> slip system under dynamic impact loading. (C) 2015 Elsevier Inc. All rights reserved.

引用

页码：359 / 367

页数：9

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