利用光学显微镜、扫描电镜、透射电镜、X射线衍射、硬度和拉伸实验研究Sn添加对钨极氩弧焊接Mg?6Al?0.3Mn(质量分数，%)(AM60)合金板材的显微组织和力学性能的影响。结果表明：向AM60镁合金中添加1%(质量分数)的Sn后，即Mg?6Al?1Sn?0.3Mn (ATM610)，其焊缝的硬度和接头效率均提高。ATM610镁合金焊缝抗拉强度达到母材的96.8%，且断裂位置也由热影响区转移至熔合区。焊接性能的改善主要源于合金中Mg2Sn有效阻碍热影响区晶粒的长大而形成的细小显微组织。在AM60镁合金中添加1%的Sn可改善其力学性能。
The effects of Sn addition on the microstructure and mechanical properties of gas tungsten arc butt-welded Mg?6Al?0.3Mn (AM60) (mass fraction, %) alloy sheets were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and microhardness and tensile tests. The results indicate that both the average microhardness and joint efficiency of AM60 are improved by the addition of 1%Sn (mass fraction). The ultimate tensile strength of Mg?6Al?1Sn?0.3Mn (ATM610) reaches up to 96.8% of that of base material. Moreover, fracture occurs in the fusion zone of ATM610 instead of in the heat-affected zone of AM60 welded joint. The improvement in the properties is mainly attributed to the formation of Mg2Sn, which effectively obstructs the grain coarsening in the heat-affected zone, resulting in a relatively fine microstructure. The addition of 1%Sn improves the mechanical properties of AM60 welded joint.
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