TY - JOUR
T1 - Microstructure evolution and mechanical properties of ultrafine-grained Al–Li alloy fabricated via friction stir additive manufacturing
AU - Jiang, Tao
AU - Zhang, Mingtao
AU - Dai, Guoqing
AU - Shen, Zhikang
AU - Guo, Yanhua
AU - Sun, Zhonggang
AU - Li, Wenya
N1 - Publisher Copyright:
© 2024
PY - 2024/3
Y1 - 2024/3
N2 - 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 μm. 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 θ’ 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.
AB - 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 μm. 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 θ’ 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.
KW - Al–Li alloy
KW - Friction stir additive manufacturing
KW - Mechanical properties
KW - Microstructure evolution
KW - Ultrafine grains
UR - http://www.scopus.com/inward/record.url?scp=85185828801&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2024.113760
DO - 10.1016/j.matchar.2024.113760
M3 - 文章
AN - SCOPUS:85185828801
SN - 1044-5803
VL - 209
JO - Materials Characterization
JF - Materials Characterization
M1 - 113760
ER -