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采用合金熔炼、组织分析和拉伸试验,研究了Mg-10Y-1.5Sm合金经过固溶时效后的组织和力学性能。结果表明,合金的组织由α-Mg基体和Mg24Y5相组成,细小的Mg24Y5颗粒相均匀弥散地分布在α-Mg基体上;Sm加入后没有形成新相,而是通过固溶作用,进一步强化了α-Mg基体和Mg24Y5相;合金在200～300℃之间的抗拉强度均大于200 MPa,伸长率均为3%左右,与室温时相比没有发生显著变化;合金的力学性能优于Mg-10Y合金,最高使用温度可达350℃。
The microstructure and mechanical properties of Mg-10Y-1.5Sm alloy after solution-aging were studied by alloy melting, microstructure analysis and tensile test. The results show that the microstructure of the alloy is composed of α-Mg matrix and Mg 24 Y 5 phase, and the fine Mg 24 Y 5 particles distribute uniformly and homogeneously on the α-Mg matrix. Sm did not form a new phase but added by solid solution α-Mg matrix and Mg24Y5 phase. The tensile strength of the alloy is higher than 200 MPa at 200-300 ℃ and the elongation is about 3%, which shows no significant change compared with that at room temperature. The mechanical properties of the alloy are better than Mg-10Y alloy, the maximum temperature up to 350 ℃.