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《Materials for Mechanical Engineering》 2015-01
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Deformation Behavior and Microstructure Evolution of AZ31 Magnesium Alloy at Impact Load

LIU Long-fei;JIANG Bing-chun;ZHAO Jun;LU Li-wei;Engineering Research Center of Advanced Mining Equipment,Ministry of Education,Hunan University of Science and Technology;  
The deformation behavior and microstructure evolution of AZ31 magnesium alloy at the dynamic impact were studied by Hopkinson pressure bar testing,the spacing ring limit technology and microscopic observation,etc.At last,the plastic deformation mechanisms of AZ31 magnesium alloy were analyzed.The results show that the flow stress of AZ31 magnesium alloy increased with the increase of strain gradually in the range of strain rate from 1 524s-1 to 2 024s-1 and demonstrated the strain strengthening effect.The plastic deformation mechanisms of AZ31 magnesium alloy were transformed in turn by the slip and twinning,grain refinement,deformation localization with the increase of plastic deformation.Meanwhile,the temperature within shear band was about 241 Kand met the twinning dynamic recrystallization′s temperature.The slip and twin rotation in grain are the main mechanism of grain refinement within shear bands,and the transient temperature rise promotes the grain refining.
【Fund】: 国家自然科学基金资助项目(50801026);; 湖南省自然科学省市联合基金资助项目(12JJ9011);; 湖南省教育厅科学研究项目(14C0454);; 湖南省高校科技创新团队支持计划资助项目
【CateGory Index】: TG146.22
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