TIG电弧增材制造Mg-6Gd-1Y-0.2Zr合金的微观组织及力学性能研究

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文章编号：2096-2983（2025）03-0053-10

关键词：电弧增材制造；Mg-6Gd-1Y-0.2Zr合金；组织演变；力学性能中图分类号：TG146.22 文献标志码：A

Abstract： Large-scale magnesium aloy components fabricated via wire-arc additive manufacturing （WAAM） hold promising application prospects in aerospace， transportation， and electronic communication sectors. However， currnt research on WAAM magnesium alloys produced by tungsten inert gas （TIG）-based WAAM technology mainly focuses on Mg -Al series alloys，and there are relatively few studies on rare earth magnesium alloys. Thin-walled parts of Mg-6Gd-lY-0.2Zr alloy were fabricated by TIG-WAAM， and their microstructure characteristics and mechanical properties were studied. The results show that the thin-waled part has a well-formed surface，and its microstructure is mainly composed of αa-Mg matrix， Mg24（Gd，Y）5 phase and γ′ phase. Due to undergoing different numbers of thermal cycles， the grain size and mechanical properties are unevenly distributed along the height direction of the thin-walled part. The average grain sizes at the bottom， middle and top sections of the thin-walled part are 44， 10l and 80μm respectively. The Vickers hardness decreases gradually from the bottom to the top.The ultimate tensile strengths （UTS） in the horizontal and height directions are （243±3） MPa and （219±10） ） MPa， respectively; the yield strengths （YS） are （ 159±1 ）MPa and （143±6） （ MPa respectively； the elongations （EL） are （15.0±1.4）% and （17.2±0.9）% ，respectively. The performance differences between directions can be attributed to the formation of columnar grains structures due to the temperature gradient during the cooling， which leads to anisotropic microstructure and mechanical properties of the thin-walled part.

Keywords： wire-arc additive manufacturing; Mg-6Gd-1Y-0.2Zr alloy; microstructure evolution; mechanical properties

镁的密度仅为 1.7g/cm3 ，是目前已知的最轻的金属材料之一。（剩余13613字）