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通过扫描电镜、能谱仪、面扫描、差热分析和拉伸测试,研究了采用稀土Sm部分替代稀土Ce、La对A(Ce、La)44镁合金组织与性能的影响。结果表明,Sm部分替代Ce、La后,不会改变A(Ce、La)44合金微观组织的分布,但会析出新的高温相Al_2Sm和Al_(11)Sm_3,且A(Ce、La、Sm)44和A(Ce、La)44两种合金中均不含有低熔点相Mg_(17)Al_(12);A(Ce、La、Sm)44合金的固-液相温度区间及铸造性能与A(Ce、La)44合金相当;A(Ce、La、Sm)44合金的室温和高温强度与A(Ce、La)44合金没有明显差异,在200℃时两种合金的抗拉强度均在100 MPa以上,屈服强度都在90 MPa以上,伸长率超过30%。
The effects of rare earth element Sm on the microstructure and properties of A (Ce, La) 44 magnesium alloy were investigated by scanning electron microscopy, energy dispersive spectroscopy, surface scanning, differential thermal analysis and tensile test. The results show that the partial substitution of Sm for Ce and La will not change the microstructure of A (Ce, La) 44 alloy, however, new high temperature Al 2 Sm and Al 11 Sm 3 will be precipitated and A (Ce, La, Sm ) 44 and A (Ce, La) 44 do not contain Mg_ (17) Al_ (12); the solid-liquid temperature range and casting performance of A (Ce, La, Sm) A (Ce, La) 44 alloy is equivalent; the room temperature and high temperature strength of A (Ce, La, Sm) 44 alloy is not significantly different from A (Ce, La) 44 alloy. Above 100 MPa, the yield strength is above 90 MPa and the elongation exceeds 30%.