| 黄蒙,李家民,何凌欢,侯娟,唐伟能,莫宁,时云,杨义.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[J].有色金属材料与工程,2025,46(3):53-62. |
| 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 |
| Microstructures and mechanical properties of Mg-6Gd-1Y-0.2Zr alloy manufactured by TIG wire-arc additive manufacturing |
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| DOI：10.13258/j.cnki.nmme.20250120001 |
| 中文关键词: 电弧增材制造 Mg-6Gd-1Y-0.2Zr合金 组织演变 力学性能 |
| 英文关键词:wire-arc additive manufacturing Mg-6Gd-1Y-0.2Zr alloy microstructure evolution mechanical properties |
| 基金项目:上海市科技创新项目资助(XTCX-KJ-2022-2-11) |
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| 中文摘要: |
| 通过电弧增材制造（wire-arc additive manufacturing，WAAM）制备的大型镁合金零件在航空航天、交通运输和电子通信领域具有广阔的应用前景。然而，目前基于非熔化极钨惰性气体（tungsten inert gas，TIG）WAAM技术制备镁合金研究主要集中在Mg-Al系合金上，对稀土镁合金的研究较少。通过TIG-WAAM制备了Mg-6Gd-1Y-0.2Zr合金薄壁件，研究了其显微组织特征和力学性能。结果表明：薄壁件具有良好的成形表面，显微组织主要由α-Mg基体、Mg24（Gd，Y）5相与γ′相组成；由于经历了不同次数的热循环，晶粒尺寸和力学性能沿薄壁件高度方向分布不均匀；薄壁件底部、中部、顶部平均晶粒尺寸分别为44、101、80 μm；从底部到顶部的维氏硬度逐渐降低；水平方向和高度方向的极限抗拉强度（ultimate tensile strength，UTS）分别为（243±3） MPa和（219±10） MPa；屈服强度（yield strength，YS）分别为（159±1） MPa和（143±6） MPa；伸长率（elongation，EL）分别为（15.0±1.4）%和（17.2±0.9）%。不同方向的性能差异可归因于在冷却过程中由于温度梯度形成了柱状晶组织，这种组织特征使得薄壁件在组织和性能上展现出各向异性。 |
| 英文摘要: |
| Large-scale magnesium alloy components fabricated via wire-arc additive manufacturing (WAAM) hold promising application prospects in aerospace, transportation, and electronic communication sectors. However, current 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-1Y-0.2Zr alloy were fabricated by TIG-WAAM, and their microstructure characteristics and mechanical properties were studied. The results show that the thin-walled part has a well-formed surface, and its microstructure is mainly composed of α-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, 101 and 80 μm 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. |
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