Microstructure and Mechanical Properties of Electron Beam Welded 5A90 Al-Li Alloy

Abstract:

The microstructure and fracture of electron beam welded 5A90 Al-Li alloy joints were investigated by metallographic microscope and scanning electronic microscope. The results show that the focus of electron beam was on the surface of workpiece when the electron beam focusing current was 1570mA, and the joint formed best. The joints microstructure analysis demonstrated that the weldment mainly consists of fine equiaxed grains which growing coarser with the electron beam current increasing. The tensile strength up to 304.4MPa under the optimal welding parameters (U_a=90KV, I_f=1570mA, v=25mm/s, I_b=16mA). There were a lager number of dimples on the fracture surface,and the joints obviously present the characteristic of transgranular fracture.

• Periodical: Advanced Materials Research (Volume 1095)
• Pages: 906-910
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1095.906
• Online since: March 2015
• Authors: Bo Lin, Long Chen, Dong Hai Cheng
• Keywords: 5A90 Aluminum Lithium Alloy, Electron Beam Welding, Mechanical Properties, Microstructure

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