( 1. 东北大学 材料电磁过程研究教育部重点实验室，沈阳 110004;
2. 东北大学 理学院， 沈阳 110004)
摘 要: 采用Gleeble-1500D热模拟试验机、 差热分析仪和光学显微镜等对低频电磁铸造AZ41镁合金铸锭热压缩流变特征及微观组织进行研究。 结果表明： AZ41镁合金铸锭热压缩变形存在明显的动态回复和动态再结晶特征； 当温度为453～523 K时， 以动态回复为主； 当温度为593～723 K时， 以动态再结晶为主要机制； 当温度为593 K， 应变速率为1.0 s-1时， 形变激活能最低， 流变过程最稳定， 中心和边缘部位的晶粒得到明显细化。 在变形期间， Mg17Al12相的破碎和溶解促进动态再结晶显著发生。
关键字: AZ41镁合金； Mg17Al12 相； 低频电磁铸造； 动态再结晶
（ 1. Key Laboratory of Electromagnetic Processing of Materials,
Ministry of Education, Northeastern University,
Shenyang 110004, China;
2. College of Science, Northeastern University,
Shenyang 110004, China）
Abstract: The characteristics of thermal compressing flow and microstructure of AZ41 magnesium alloy cast by low frequency electrical magnetic field (LFEMC) were studied through thermal simulation tester Gleeble-1500D.The results show that there exist obviously dynamic recovery and dynamic recrystallization (DRX) during thermal compression of the LFEMC AZ41 magnesium alloy. The dynamic recovery is prominent character at 453-523 K, but DRX is prominent behavior at 593-723 K. The flow process is the most stable and the microstructures at the center and the edge of specimens are markedly refined by DRX at the temperature of 593 K and the strain rate of 1.0 s-1. The crash and dissolution of Mg17Al12 phase accelerate DRX during deforming.
Key words: AZ41 magnesium alloy; Mg17Al12 phase; low frequency electrical magnetic field; dynamic recrystallization
