AZ31-1Sm镁合金高温压缩热变形行为和微观组织研究

稀有金属材料与工程, 2014, 43(11): 2572-2575.

AZ31-1Sm镁合金高温压缩热变形行为和微观组织研究

1.广州有色金属研究院,广东广州510650

2.广州有色金属研究院,广东广州510650

3.广州有色金属研究院,广东广州510650

4.广州有色金属研究院,广东广州510650

基金项目: Science and Technology Innovation Platform with Guangdong Provincial Department of Industry-Academy Research (2012B090600051)

关键词：热变形 , 微观组织 , 双曲正弦 , 本构方程

Hot Deformation Behavior and Microstructure of AZ31-1Sm Alloy Compression at Elevated Temperatures

Keywords： hot deformation , microstructure , hyperbolic-sine , constitutive equation

在单向压缩热模拟试验机上对AZ31-1Sm合金在变形温度为300～450℃、应变速率为0.01～1 s-1条件下的热变形行为和微观组织进行研究.结果表明:AZ31-1Sm镁合金在热压缩变形时,流变应力随着应变速率的增大和变形温度的降低而增大;该合金的热压缩流变应力行为可用双曲正弦形式的本构方程来描述,在本实验条件下,AZ31-1Sm镁合金热热变形激活能Q为160.8 kJ/mol.AZ31-1Sm易发生动态再结晶,在高变形温度和低应变速率条件下动态再结晶趋势明显,动态再结晶晶粒尺寸随着变形温度的增加和应变速率的降低而增大.

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