Modelling the temperature and texture effects on the deformation mechanisms of magnesium alloy AZ31

被引：0

作者：

Tam, Kenneth J. ^{[1
]}

Vaughan, Matthew W. ^{[2
]}

Shen, Luming ^{[1
]}

Knezevic, Marko ^{[3
]}

Karaman, Ibrahim ^{[2
]}

Proust, Gwénaëlle ^{[1
]}

机构：

[1] School of Civil Engineering, The University of Sydney, NSW,2006, Australia

[2] Department of Materials Science and Engineering, Texas A&M University, College StationTX,77843, United States

[3] Department of Mechanical Engineering, University of New Hampshire, Durham,NH,03824, United States

来源：

International Journal of Mechanical Sciences | 2021年 / 182卷

关键词：

A temperature sensitive viscoplastic self-consistent (VPSC) model is developed to investigate the temperature and texture effects on the deformation mechanisms of a hot-rolled magnesium (Mg) alloy AZ31. A novel approach to incorporate the drag stress and dislocation-dislocation interactions as temperature dependent parameters is conducted in this paper. In addition; the model is coupled with a composite grain twin model; and dislocation density based hardening laws to predict the activation of the deformation modes participating in strain accommodation in Mg alloys: 〈a〉 basal slip; 〈a〉 prismatic slip; and 〈c+a〉 pyramidal slip; {101¯2} tensile twinning; and {101¯1} compressive twinning. The model is validated against an experimental study; realised on a hot-rolled AZ31 Mg alloy deformed at temperatures ranging from 25°C to 200°C under uniaxial tensile loads parallel to; perpendicular to; and 45° offset from the rolling direction of the material. The results of the simulations are in agreement with the experimental data in terms of hardening behaviour; deformation activities; and texture evolution. The presence of dynamic recrystallisation; which is observed experimentally at higher temperatures; shows the limitations of the present model. © 2020;

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