添加Sn对钨极氩弧焊接AM60镁合金板材力学性能的影响

来源期刊:中国有色金属学报(英文版)2016年第8期

论文作者:苟军 汤爱涛 潘复生 佘加 罗素琴 叶俊华 石大伟 M. RASHAD

文章页码:2051 - 2057

关键词:AM60镁合金;ATM610镁合金;Sn添加;钨极氩弧焊接;力学性能

Key words:AM60 Mg alloy; ATM610 Mg alloy; gas tungsten arc welding; mechanical properties

摘    要: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。

Abstract: 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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