摘要
利用Sans CMT4104型拉伸试验机对搅拌摩擦加工(Friction Stir Processing,FSP)AZ31镁合金在变形温度为250~400℃、应变速率为0.001~0.05 s^(-1)条件下的高温变形行为进行研究。结果表明,FSP处理后,镁合金平均晶粒尺寸减小到3.89μm。热变形过程中,随着变形温度升高和应变速率降低,加工区晶粒逐渐粗化。当变形温度为300~350℃,应变速率为0.001~0.005 s^(-1)时,材料的伸长率均超过100%,表明FSP加工后镁合金具有良好的超塑性。在不同热变形条件下,AZ31镁合金的真应力-真应变曲线均出现峰值,且峰值应力随变形温度的升高和应变速率的降低而减小。综合流变应力和微观组织分析发现,适合AZ31镁合金的热变形工艺参数范围是变形温度为300~350℃、应变速率为0.001~0.005 s^(-1)。
The high temperature deformation behavior of AZ31 magnesium alloy after friction stir processing(FSP)under deformation temperature of 250~400℃,strain rate of 0.001~0.05 s^(-1) were investigated by Sans CMT4104 tensile testing machine.The results show that after FSP treatment,the average grain size of magnesium alloy is decreased to 3.89μm.In the process of hot deformation,with the increase of deformation temperature and the decrease of strain rate,the grain is coarsened gradually.When the deformation temperature is 300~350℃ and the strain rate is 0.001~0.005 s^(-1),the elongation of the alloy reaches over 100%,which indicates that the magnesium alloy has desirable superplasticity after FSP processing.Under different thermal deformation conditions,the true stress-strain curves of AZ31 magnesium alloy show peak values,and the peak stress is decreased with the increase of deformation temperature and the decrease of strain rate.According to the flow stress and microstructure analysis,the suitable thermal deformation parameters of AZ31 magnesium alloy are 300~350℃,and the strain rate is 0.001~0.005 s^(-1).
作者
沈福欣
徐勇
彭聪
应国民
陈乐平
Shen Fuxin;Xu Yong;Peng Cong;Ying Guomin;Chen Leping(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University)
出处
《特种铸造及有色合金》
CAS
北大核心
2023年第8期1085-1088,共4页
Special Casting & Nonferrous Alloys
关键词
AZ31镁合金
高温变形
微观组织
动态再结晶
AZ31 Magnesium Alloy
High Temperature Deformation
Microstructure
Dynamic Recrystallization
作者简介
第一作者:沈福欣,男,1998年出生,硕士研究生,南昌(330063),E-mail:1586917449@qq.com;通信作者:徐勇,男,1978年出生,副教授,南昌(330063),E-mail:xuyong@nchu.edu.cn。
