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张 清,陈 君,李全安.时效硬化Mg-10Y-1.5Sm合金的强度稳定性[J].稀有金属材料与工程(英文),2018,47(3):799~802.[Zhang Qing,Chen Jun and Li Quan-an.Strength stability of aging hardened Mg-10Y-1.5Sm alloy[J].Rare Metal Materials and Engineering,2018,47(3):799~802.]
Strength stability of aging hardened Mg-10Y-1.5Sm alloy
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Received:March 24, 2016  Revised:August 24, 2016
Key words: magnesium alloy  rare earth  tensile strength  strengthening phase
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Zhang Qing,Chen Jun and Li Quan-an  
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      The tensile strength stability of aging hardened Mg-10Y-1.5Sm (mass fraction, %) alloy was investigated by microstructure analysis and tensile tests. The results show that the microstructure of Mg-10Y-1.5Sm alloy consists of α-Mg matrix and Mg24Y5 phase and the formation of Sm-containing phase is not observed. With the increase of temperature from 20 oC to 300 oC, the tensile strength exceeds 200 MPa and has no obvious change. It is insensitive to temperature and the variation range is less than 10 MPa. The strength stability is superior to that of heat resistant magnesium alloy WE54 developed most successfully. The reason is mainly attributed to the hardness stability of strengthening phase Mg24Y5 enhanced by dissolved Sm.