Effect of Sm on the Microstructure and Mechanical Property of Mg-xSm-0.4Zn-0.3Zr Alloys
The effect of Sm content (2,4,6,8wt.%) on the microstructures and mechanic properties of gravity casting Mg-xSm-0.4Zn-0.3Zr alloys were investigated.The results showed that the cast alloy mainly consists of α-Mg matrix and Mg41Sm5 phase distributed at the grain boundaries,and the amount of the second phase increased with the rise of Sm content.After the solution treatment (T4),the second phase disappeared,however small amount of cuboid-like phase were found inside the grain,and its volume fraction also increases with the rise of Sm content.It is found in the age hardening curves of the alloys at 175,200,and 225 oC that the alloys with various components almost showed the same trend of age hardening.While the higher the Sm content,the harder the alloy.With the Sm content increases,the yield strength (TYS) of cast alloys (F state) were obviously improved,however the tensile strength (UTS) became lower because of the quick drop of the elongation.The elongations of solid solution (T4) and aging (T6) alloy became lower,while the yield strength and tensile strength increased at first and then decreased.The optimized component is Mg-4Sm-0.4Zn-0.3Zr,which the mechanic properties at T6 state are: TYS=131MPa; UTS=261MPa; δ=6.8%.
Mg-RE alloy Mg-Sm-Zn-Zr alloy Solid solution Aging Mechanical property
Xin Su Dejiang Li Yancai Xie Xiaoqin Zeng Wenjiang Ding
School of Materials Science and Engineering, The State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University , 800 Dongchuan RD. Minhang District, Shanghai 200240, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
238-244
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）