摘要
用铸造工艺制备Mg-5Sm-2Gd镁合金,使用Gleeble-1500热模拟试验机,在温度为300℃~450℃,应变速率为0.01 s^(-1)~1 s^(-1)的条件下,对铸态Mg-5Sm-2Gd合金进行热压缩实验,分析合金的流变应力与组织变化。结果表明,降低温度或增大应变速率,合金的热压缩流变应力增大。合金在热压缩过程中发生了动态再结晶。合金在300℃时激活能过大,不适合进行热压缩。在350℃~450℃范围内构建了合金的热压缩流变应力本构方程,其中热压缩激活能为232.017 kJ/mol。流变应力预测值与实际值误差绝对值在5.17%以内。
Mg-5Sm-2Gd magnesium alloy was fabricated by casting method.Hot compression of as cast Mg-5Sm-2Gd alloy was carried out by using Gleeble-1500 thermal simulation tester at temperature of 300℃to 450℃and strain rate of 0.01 s^(-1)to 1 s^(-1),and the flow stress and microstructure changes of the alloy were analyzed.The results showed that the hot compression flow stress of the alloy increases with decreasing temperature or increasing strain rate.Dynamic recrystallization of the alloy occurs during hot compression.The activation energy of the alloy at 300℃is too large to be suitable for hot compression.The hot compression flow stress constitutive equation of the alloy is constructed in the range of 350℃to 450℃,in which the hot compression activation energy is 232.017 kJ/mol.The absolute error between the predicted value and the actual value of flow stress is within 5.17%.
作者
王海宁
李萍
张清
WANC Haining;LI Ping;ZHANG Qing(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;School of Civil Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China;Provincial and Ministerial Co-construction Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology,Luoyang 471023,China)
出处
《稀土》
CAS
CSCD
北大核心
2023年第2期45-51,I0004,共8页
Chinese Rare Earths
基金
国家自然科学基金项目(U1404501)
河南省科技攻关计划项目(222102230112)。
关键词
镁合金
热压缩
流变应力
激活能
magnesium alloy
hot compression
flow stress
activation energy
