Compression Deformation Behavior of AZ31 Magnesium Alloy under Al/Cu Constraints

doi:10.3901/JME.2022.12.093

Abstract

Abstract: In order to improve the limited formability of magnesium alloy during low temperature compression and prevent premature fracture. Uniaxial compression deformation test and finite element simulation were carried out by Gleeble-3800 thermal simulation testing machine under the conditions of deformation temperature 200℃ and strain rate 0.01-1 s^-1, and the effects of different strain rates and sleeve materials on formability of AZ31 magnesium alloy were analyzed. The results show that, compared with unconstrained compression, the stress and strain in the compression deformation zone of confined magnesium alloy show zonal layered distribution, and the metal confined flow makes the non-free deformation zone diffuse along the drum shape 45° shear cracking disappeared but 45° drum distortion appeared at 1 s^-1. The damage distribution is negatively correlated with the degree of tissue deformation and positively correlated with the toughness of constraint materials. Twinning and dynamic recrystallization grains increase in constrained deformation zone. Comparing the experimental and simulation results, it is found that under the strain rate of 0.01 s^-1, the deformation area of magnesium alloy restrained by sleeve Cu is layered and concentrated, the deformation uniformity of microstructure is better, the damage value is smaller, cracking is effectively inhibited, and the formability of magnesium alloy is improved.

Key words: AZ31 alloy, thermal simulation, constrained compression, damage

CLC Number:

TG156

LIU Cong, MA Lifeng, JIA Weitao, LEI Junyi, LE Qichi, YUAN Yuan, PAN Hucheng. Compression Deformation Behavior of AZ31 Magnesium Alloy under Al/Cu Constraints[J]. Journal of Mechanical Engineering, 2022, 58(12): 93-102.

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