Superplasticity of Fine-grained AZ31 Magnesium Alloy Prepared by Friction Stir Processing

被引:0
|
作者
Gao Xue [1 ]
Zhang Zheng [1 ]
Wang Wen [1 ]
Hai Minna [1 ]
Jia Shaowei [1 ]
Wang Kuaishe [1 ]
机构
[1] Xian Univ Architecture & Technol, Xian 710055, Peoples R China
关键词
friction stir processing; AZ31 magnesium alloy; superplasticity; STRAIN RATE SUPERPLASTICITY; MICROSTRUCTURE;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
AZ31 magnesium alloy with fine-grained microstructure was prepared by friction stir processing (FSP). The superplasticity of base metal (BM) and fine-grained AZ31 magnesium alloy with different grain sizes were compared. The results show that microstructure of the AZ31 hot-rolled plate with an average grain size of 7.67 mu m is refined to 0.94 similar to 3.21 mu m. The maximum elongation of the BM is 630% at 450 degrees C and 5x10(-4) s(-1),while that of the FSP AZ31 alloy is 405% in the same situation, indicating there is no linear relationship between grain size and superplastic performance. Superplastic deformation mechanism is mainly grain boundary sliding, and twin crystal also affects the deformation. The failure mechanism is cavity generation, growth and coalescence.
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页码:1855 / 1860
页数:6
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