On the association between microhardness, corrosion resistance and microstructure of probeless friction stir spot welded Al-Li joint

被引:13
|
作者
Chu, Q. [1 ]
Hao, S. J. [1 ]
Li, W. Y. [1 ]
Yang, X. W. [1 ]
Zou, Y. F. [1 ]
Wu, D. [1 ]
Vairis, A. [1 ,2 ]
机构
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Shaanxi Key Lab Frict Welding Technol, Xian 710072, Shaanxi, Peoples R China
[2] Hellen Mediterranean Univ, Mech Engn Dept, Iraklion 71004, Crete, Greece
基金
中国国家自然科学基金;
关键词
Friction stir spot welding; Aluminum-Lithium alloy; Microhardness; Precipitate; Recrystallization; Corrosion resistance; MECHANICAL-PROPERTIES; ALLOY; EVOLUTION; BEHAVIOR; TEXTURE; PRECIPITATION; MORPHOLOGY; AA5083;
D O I
10.1016/j.jmrt.2021.07.120
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The precipitation behavior and development of grain structure have been investigated to reveal their association with the microhardness and corrosion resistance of probeless friction stir spot welded (P-FSSW) joint of an Al-Li alloy. Results identified the primary strengthening phase of T-1 (Al2CuLi) to be completely dissolved in the stir zone (SZ), while equiaxed grains were formed. Grain refinement was directly associated with the combined effect of continuous dynamic recrystallization and geometrized effect of imposed strain. However, as localized grain boundary bulging indicated, limited discontinuous recrystallization also participated in the microstructure evolution. The hardness dropped noticeably in the heat affected zone (HAZ) due to the weakening of precipitation and dislocation strengthening, which resulted from partial dissolution or coarsening of T-1 phase and recovery effect. Grain refinement and solution strengthening were responsible for the slight increase in hardness of the SZ. In addition, the SZ had minute increased pitting resistance due to the homogenization of intermetallic particles, precipitate dissolution and refined grains. (C) 2021 The Author(s). Published by Elsevier B.V.
引用
收藏
页码:2394 / 2405
页数:12
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