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Coupled Influence of Temperature and Strain Rate on Tensile Deformation Characteristics of Hot-Extruded AZ31 Magnesium Alloy
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Coupled Influence of Temperature and Strain Rate on Tensile Deformation Characteristics of Hot-Extruded AZ31 Magnesium Alloy
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Coupled Influence of Temperature and Strain Rate on Tensile Deformation Characteristics of Hot-Extruded AZ31 Magnesium Alloy
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Journal Article
Coupled Influence of Temperature and Strain Rate on Tensile Deformation Characteristics of Hot-Extruded AZ31 Magnesium Alloy
2016
Overview
Abstract To explore the coupled effect of temperature T and strain rate ε on the deformation features of AZ31 Mg alloy, mechanical behaviors and microstructural evolutions as well as surface deformation and damage features were system- atically examined under uniaxial tension at T spanning from 298 to 523 K and ε from 10^-4 to 10^-2 s-1. The increase in T or the decrease in ε leads to the marked decrease in flow stress, the appearance of a stress quasi-plateau after an initially rapid strain hardening, and even to the occurrence of successive strain softening. Correspondingly, the plastic deformation modes of AZ31 Mg alloy transform from the predominant twinning and a limited amount of dislocation slip into the enhanced non-basal slip and the dynamic recrystallization （DRX） together with the weakened twinning. Meanwhile, the cracking modes also change from along grain boundaries （GBs） and at twin boundaries （TBs） or the end of twins into nearby GBs where the DRX has occurred. The appearance of a stress quasi-plateau, the formation of large-sized cracks nearby GBs, and the occurrence of continuous strain softening, are intimately related to the enhancement of the non-basal slip and the DRX.
Publisher
The Chinese Society for Metals,Springer Nature B.V
Subject
/ Characterization and Evaluation of Materials
/ Chemistry and Materials Science
/ Slip
/ 动态再结晶
/ 应变率
/ 拉伸变形
/ 流动应力
/ 温度
/ 热挤压
/ 耦合特性
