刘天模,刘世宇,彭天成,刘建忠,刘宇,潘复生

• 1:重庆大学材料科学与工程学院
• 2:国家镁合金材料工程技术中心

摘要(Abstract)：

将Φ40mm×50mm的AZ31镁合金圆棒经变通道角挤压(Change channel angular extrusion,CCAE)成厚度约为5mm的板材。通过TEM观察表明,AZ31镁合金的形核机制主要是动态再结晶形核。结果表明,经CCAE变形后,由晶粒的剪切破碎和动态再结晶使得镁合金晶粒明显细化。内角、挤压比、挤压温度和挤压速率等对板材的显微组织结构有重要的影响。在100~450℃温度范围内进行CCAE变形,AZ31镁合金的晶粒尺寸随变形温度的升高而增大。AZ31镁合金经CCAE热变形后,合金的综合力学性能得到改善。

关键词(KeyWords)： 镁合金;动态再结晶;变通道角挤压(CCAE)

Abstract:

Keywords:

基金项目(Foundation): 国家“973”计划项目(2007CB613700);; 国家大学生创新基金(CQUCX-G-2007-39)

作者(Author): 刘天模,刘世宇,彭天成,刘建忠,刘宇,潘复生

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