Experimental and Numerical Investigation of the Grain Size Evolvement of AZ31 Mg Alloy during High Ratio Extrusion

摘要：

　　The grain size evolvement of AZ31 magnesium alloy during high ratio extrusion (HRE) was investigated by experiment and numerical simulation.A Yada model was established according to the results of experimental study and trial calculation.Effects of the deformation temperature,extrusion ratio and extrusion velocity on the grain size were analyzed.The results showed that the microstructure of the AZ31 alloy was dramatically refined by high ratio extrusion.The deformation conditions exhibited obvious effects on the grain size,and the deformation conditions were interplaying and interacting with each other during the HRE process.Compared to the deformation temperature and extrusion velocity,the severe plastic deformation induced by the high ratio extrusion is a major cause of grain refinement.With the increasing of the extrusion velocity,the grains could be refined due to a shorter recrystallized grain growth time.At the same time,the deformation temperature increased with the increasing of the plastic strain rate,which results in faster recrystallized grain growth.Finally,recommended method is advised to further refine the grain size.

关键词： High ratio extrusion AZ31 magnesium alloy Grain size evolvement Yada model

作者: Jinbao Lin Lifeng Ma Yanxia Chen Chao Wang Qingxiang Liang Xiaochao Cui

作者单位: School of Applied Science, Taiyuan University of Science and Technology, Taiyuan, China;Center of Ro Center of Rolling Engineering, Taiyuan University of Science and Technology, Taiyuan, China School of Applied Science, Taiyuan University of Science and Technology, Taiyuan, China

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 211-216

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）