期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 300, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2021.117430
关键词
Additive manufacturing; AZ31 magnesium alloy; Equiaxed grain; Mechanical properties; Electrochemical corrosion performance
资金
- National Key Research and Development Program of China [2018YFB1106302]
- China Postdoctoral Science Foundation [2019M663682]
- 64th China Postdoctoral Science Foundation [2018M643628]
In this study, a thin wall of AZ31 Mg alloy with fine equiaxed grains was fabricated using gas tungsten arc-based wire arc additive manufacturing (WAAM-GTA) technology. The microstructure, defects, and properties of the samples were analyzed, and it was found that WAAM-GTA AZ31 exhibited excellent mechanical properties and electromechanical corrosion performance.
Additive manufacturing (AM) technology has drawn tremendous attention in producing lightweight and complex metallic components. In this work, a thin wall of AZ31 Mg alloy with fine equiaxed grains was fabricated via gas tungsten arc-based wire arc additive manufacturing (WAAM-GTA) technology. The grain structure, dislocation, and texture of the hot-rolled and WAAM-GTA AZ31 samples were analyzed by EBSD, while the matrix and dispersed phases were characterized by EDS and X-ray diffraction. The 3D porosity of samples was examined quantitatively by an X-ray computed tomography (XCT). The results show that dominated equiaxed alpha-Mg grain structure was obtained together with negligible precipitated phase. The mechanical properties of WAAM-GTA AZ31 were superior to their cast counterparts and close to those of wrought AZ31, and their correlation to microstructure and defects were explored. Moreover, the WAAM-GTA AZ31 showed excellent electromechanical corrosion performance in 3.5 % NaCl solution as compared to the hot-rolled AZ31 plate. The WAAM-GTA technology therefore offers new routes to fabricate AZ31 Mg components with equiaxed grain structure, as well as favorable mechanical properties and electromechanical corrosion performance.
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