摘要
研究了Mg-8Gd-0.5Zr和Mg-8Gd-3Sm-0.5Zr两种镁合金在变形温度350～500℃、应变速率0.002～0.1 s^(-1)条件下的热压缩行为,并对两种合金的流变应力以及热变形激活能进行分析计算。结果表明:由于添加了稀土元素Sm,Mg-8Gd-3Sm-0.5Zr合金的流变应力显著增加,其热变形激活能为213.69 kJ/mol,高于Mg-8Gd-0.5Zr合金的激活能(202.98 kJ/mol);当变形温度超过400℃时,两种合金都发生了明显的动态再结晶,由于Sm的加入,使Mg-8Gd-3Sm-0.5Zr合金动态再结晶晶粒尺寸显著减小,在500℃热压缩后,Mg-8Gd-3Sm-0.5Zr合金的动态再结晶晶粒平均尺寸为10μm。
The hot deformation behaviors of Mg-8 Gd-0.5 Zr and Mg-8 Gd-3 Sm-0.5 Zr alloys at deformation temperature of 350-500℃with strain rates of 0.002-1 s-1 were studied by hot compression test.The flow stress and hot deformation activation energy of the two alloys were analyzed and calculated.The results show that the flow stress of the Mg-8 Gd-3 Sm-0.5 Zr alloy is significantly increased with the addition of rare earth element,and its hot deformation activation energy is 213.69 kJ/mol,which is higher than that of the Mg-8 Gd-0.5 Zr alloy(202.98 kJ/mol).When the deformation temperature is above 400℃,the dynamic recrystallization occurs in the two alloys.The dynamic recrystallization grain size of the Mg-8 Gd-3 Sm-0.5 Zr alloy decreases significantly due to the addition of Sm.After hot compression at 500℃,the average dynamic recrystallization grain size of the Mg-8 Gd-3 Sm-0.5 Zr alloy is 10μm.
作者
朱利敏
李全安
张清
陈晓亚
王颂博
ZHU Li-min;LI Quan-an;ZHANG Qing;CHEN Xiao-ya;WANG Song-bo(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Collaborative Innovation Center of Nonferrous Metal,Henan Province,Luoyang 471023,China;School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 740048,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第4期1-7,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51571084
51171059)
关键词
SM
热变形
动态再结晶
变形激活能
Sm
hot deformation
dynamic recrystallization
deformation activation energy
