Transactions of Materials and Heat Treatment

Title：Influence of strain on microstructure evolution and mechanical properties for WE43 magnesium alloy

Authors： He Jin He Jianli Chen Fei

Unit： Shanghai University of Engineering Science Shanghai Jiao Tong University

KeyWords： WE43 magnesium alloy critical deformation condition strain dynamic recrystallization mechanical property

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2020,45(6):182-188

Abstract：

The hot compression tests under the deformation temperatures of 250-450 ℃, the strain rates of 0.001-1 s-1 and the intermittent hot compression tests under the deformation temperature of 350 ℃ and the strain rate of 0.1 s-1 for WE43 magnesium alloy were carried out by Gleeble-3800 thermal-mechanical simulator. Then, the microstructure of intermittent hot compression samples was characterized by metallographic microscope and electron backscatter diffraction (EBSD), and the influences of strain on the microstructure evolution and mechanical properties for WE43 magnesium alloy were comprehensively analyzed. The results show that the critical deformation conditions of WE43 magnesium alloy are the deformation temperature of 350 ℃ and the strain rate of 0.1 s-1, and the alloy has good compressive plasticity which is explained by ultra-fine grains accounting for 85%. Then, the true stress-true strain curve and the microhardness curve both show the typical dynamic recrystallization characteristics. Furthermore, the microstructure analysis suggests that the particle stimulated nucleation (PSN) mechanism and the sub-crystal nucleation mechanism are the main mechanisms of recrystallization nucleation, and the dynamic recrystallization volume fraction increases with the increasing of strain. However, the optimal initial strain is 0.79. At this time, the alloy is in the period of complete recrystallization, the grains are fine (6.6 μm) and distributed uniformly, the strength and microhardness of alloy are second only to the peak value, and the alloy has good comprehensive mechanical properties.

Funds：

国家自然科学基金资助项目(51805313，51705316)；上海工程技术大学研究生科研创新项目（18KY0506）

何进(1995-)，男，硕士研究生 E-mail：hejinsues@163.com 通讯作者：何建丽(1979-)，女，博士，讲师 E-mail：hejianling792@163.com

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