Microstructure evolution and mechanical properties of ultrafine-grained Al-Li alloy fabricated via friction stir additive manufacturing

被引：11
|
作者：
Jiang, Tao [1 ]
Zhang, Mingtao [1 ]
Dai, Guoqing [2 ]
Shen, Zhikang [3 ]
Guo, Yanhua [2 ]
Sun, Zhonggang [2 ]
Li, Wenya [1 ]
机构：
[1] Northwestern Polytech Univ, Shanxi Key Lab Frict Welding Technol, Xian 710072, Peoples R China
[2] Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing 211816, Peoples R China
[3] Southwest Univ, Coll Engn & Technol, Chongqing 400715, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2024年 / 209卷
基金：
中国国家自然科学基金;
关键词：
Al - Li alloy; Ultrafine grains; Friction stir additive manufacturing; Microstructure evolution; Mechanical properties;
D O I：
10.1016/j.matchar.2024.113760
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High-strength laminated blocks of 2060 Al-Li alloy were fabricated by friction stir additive manufacturing (FSAM) in this study, and a comprehensive analysis of their microstructural evolution and mechanical properties were investigated. The microstructure of the alloy produced by FSAM exhibited ultrafine equiaxed grains ranging from 2 to 5 mu m. Dislocation multiplication can be observed after FSAM, which is formed due to plastic deformation. Both the geometrically necessary dislocations density and the proportion of low angle grain boundaries show a decreasing trend from top to bottom. The reprecipitated theta' and Al6Mn precipitates at grain boundaries was observed, exhibiting a coarsening phenomenon along the building direction. Additionally, the mechanical properties of the FSAM-produced 2060 Al-Li alloys were assessed, revealing YS, UTS, and EL values of 290.4 MPa, 443.1 MPa, and 11.06%, respectively. And the microhardness exhibited a range from 110.8HV0.2 to 139.6HV0.2. In summary, this work offers practical guidelines for optimizing the additive manufacturing quality of Al-Li alloys
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收藏
页数：11
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