Effect of aging treatment on microstructure and mechanical properties of TIG welded joints of 2195-T8 Al-Li alloy

被引：10
作者：
Guo, Xuan [1 ]
Wen, S. H. [2 ]
Jiao, H. J. [2 ]
Wu, S. J. [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
[2] Aerosp Res Inst Mat & Proc Technol, Beijing 100076, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2023年 / 196卷
关键词：
2195-T8 Al-Li alloy; Aging treatment; Microstructure; Mechanical properties; T-1; PHASE; PRECIPITATION; AEROSPACE; EVOLUTION; PRODUCTS; STRENGTH; SPACE;
D O I：
10.1016/j.matchar.2022.112576
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The weld joint of 2195-T8 Al-Li alloy was fabricated by tungsten inert gas welding and subsequently subjected to solution plus single and double aging treatments. The microstructure and properties were analyzed. The results showed that the aging treatment didn't significantly change the average grain size. The phases of delta '/beta ' and theta ' distribute in weld zone (WZ) region and theta ' phase distribute in heat affected zone (HAZ) and BM regions after single aging treatment. After double aging treatment, the precipitates in WZ was coarse delta '/beta ' and theta ' phases, while T-1 phase and s phase appear in HAZ and base metal (BM) regions. Compared to the single aging treatment, the tensile strength of the weld increased from 465 MPa to 515 MPa, while the elongation decreased from 22% to 9% after double aging treatment which can be attributed to the variation of the precipitates.
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页数：11
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