摘要
采用蠕变实验和理论计算,研究了时效态Mg-5Y-3Sm-0. 8Ca-0. 5Sb合金在250～300℃和50～70 Pa条件下的蠕变行为。结果表明,该合金具有良好的抗高温蠕变性能,其在300℃和70 MPa下的稳态蠕变速率为3. 28×10-8s-1。在50～70 MPa的应力下,当温度由250℃升到300℃时,应力指数由2. 30变为3. 22;在250～300℃的温度下,当应力由50 MPa升到70 MPa时,蠕变激活能由65. 4 kJ/mol变为81. 0 kJ/mol。
The creep behavior of aged Mg-5Y-3Sm-0.8Ca-0.5Sb alloy at 250-300℃ and 50-70 MPa was investigated by creep tests and theoretic calculation. The results show that the alloy has good high temperature creep resistance and the steady-state creep rate of 3.28×10^-8s^-1 is obtained at 300℃ and 70 MPa. At 50-70 MPa, with the increase of temperature rises from 250℃ to 300℃, the stress index changes from 2.30 to 3.22. At 250-300℃, with the increase of stress rises from 50 MPa to 70 MPa, the creep activation energy is changed from 65.4 kJ /mol to 81.0 kJ/mol.
作者
张清
朱利敏
李全安
ZHANG Qing;ZHU Limin;LI Quan′an(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023, China;Collaborative Innovation Center of Nonferrous Metals,HenanProvince,Luoyang 471023,China)
出处
《有色金属工程》
CAS
北大核心
2019年第1期1-4,共4页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(U1404501)~~
关键词
镁合金
蠕变
应力指数
蠕变激活能
magnesium alloy
creep
stress index
creep activation energy
