Mechanical behavior of Mg subjected to strain path changes: Experiments and modeling

被引：93
|
作者：
Wen, W. [1 ]
Borodachenkova, M. [1 ]
Tome, C. N. [2 ]
Vincze, G. [1 ]
Rauch, E. F. [3 ]
Barlat, F. [1 ,4 ]
Gracio, J. J. [1 ]
机构：
[1] Univ Aveiro, Dept Mech Engn, Ctr Mech Technol & Automat, P-3810193 Aveiro, Portugal
[2] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
[3] INPG UJF, CNRS, UMR 5266, Sci & Ingn Mat & Proc, F-38402 St Martin Dheres, France
[4] Pohang Univ Sci & Technol POSTECH, GIFT, Pohang 790784, Gyeongbuk, South Korea
来源：
INTERNATIONAL JOURNAL OF PLASTICITY | 2015年 / 73卷
关键词：
Constitutive behaviour; Microstructures; Strain path change; Polycrystalline material; Mechanical testing; MAGNESIUM ALLOY AZ31B; HARDENING BEHAVIOR; TEXTURE EVOLUTION; CYCLIC DEFORMATION; POLYCRYSTALS; TENSILE; METALS; COPPER; STEEL; SIMULATION;
D O I：
10.1016/j.ijplas.2014.10.009
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Two-step tension tests with reloads along different directions are performed on rolled Mg alloy sheet at room temperature. The experimental yield stress at reloading is systematically lower than before unloading. Such a behavior is captured by a microstructure-based hardening model accounting for dislocation reversibility and back-stress. This formulation, embedded in the Visco-Plastic Self-Consistent (VPSC) model, links the dislocation density evolution throughout the deformation with hardening. The predicted results agree well with the experimental data in terms of flow stress response and texture evolution. The effects of texture anisotropy and back-stress on the mechanical response during the strain path change are discussed. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：171 / 183
页数：13
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