Effect of post-weld heat treatment on the microstructure, phase composition and mechanical properties of dissimilar Al-Mg-Li/Al-Cu-Li laser welded joints
Optics & Laser Technology(2024)
摘要
•High-strength laser dissimilar welded joints of aluminum–lithium alloys were obtained.•The post-heat treatment of the weld has been optimized to obtain maximum mechanical properties.•Quenching formed δ′(Al3Li) in the weld. Artificial aging led to T1(Al2CuLi) formation and increased δ′(Al3Li) content.•After PWHT, joint showed properties, similar to Al-Mg-Li alloy: 411 MPa ultimate strength, 327 MPa yield, 1.7 % elongation.
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关键词
Laser welding,Aluminum–lithium alloy,Microstructure,Phase composition,Mechanical properties,Synchrotron radiation
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