锻压技术

应变量对WE43镁合金微观组织演变及力学性能的影响

英文标题：Influence of strain on microstructure evolution and mechanical properties for WE43 magnesium alloy

作者：何进何建丽陈飞

分类号：TG146.2

出版年,卷(期):页码：2020,45(6):182-188

摘要：

采用Gleeble-3800热模拟试验机对WE43镁合金进行了变形温度为250~450 ℃、应变速率为0.001~1 s-1的热压缩试验及变形温度为350 ℃、应变速率为0.1 s-1的间歇性热压缩试验，并利用金相显微镜和电子背散射衍射（EBSD）对间歇性压缩试样的微观组织进行了表征，综合分析了应变量对WE43镁合金微观组织演变及力学性能的影响。结果表明：变形温度为350 ℃、应变速率为0.1 s-1是WE43镁合金的临界变形条件，占比达85%的超细晶粒可以解释此时合金较好的压缩塑性。真应力-真应变曲线和显微硬度曲线均呈典型的动态再结晶特性，微观组织分析表明，粒子激发形核（PSN）机制及亚晶形核机制是其再结晶形核的主要机制，且动态再结晶体积分数随应变量的增加而增大。应变量为0.79时是最优的初始应变量，此时合金处于完全再结晶时期，晶粒细小（6.6 μm）且分布均匀，合金强度与硬度均仅次于峰值，合金综合力学性能较好。

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.

基金项目：

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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