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采用XRD、OM和SEM手段研究了Sm(0~2.0%,质量分数,下同)对AZ61合金显微组织和力学性能的影响。结果表明,Sm优先与A1形成高熔点Al2Sm弥散相,细化合金显微组织,提高时效态合金室温抗拉强度和屈服强度。在研究范围内,加入1.5%Sm的合金力学性能最优。Sm可以通过细晶强化、Ramakrishnan强化和Gypen固溶强化机制对AZ61合金强度产生影响。
The effects of Sm (0 ~ 2.0%, mass fraction, the same below) on the microstructure and mechanical properties of AZ61 alloy were investigated by XRD, OM and SEM. The results show that Sm preferentially forms a high melting point Al2Sm phase with A1, and the microstructure of the alloy is refined to increase the room temperature tensile strength and yield strength of the aged alloy. Within the scope of the study, the alloy with 1.5% Sm has the best mechanical properties. Sm can affect the strength of AZ61 alloy through fine grain strengthening, Ramakrishnan strengthening and Gypen solution strengthening.