Investigation on Mechanical Properties and Microstructures of Resistance Spot Welded Aluminum-Lithium Alloy (5A90)

Qi Fan; Yi Ping Chen; Dong Hai Cheng

doi:10.4028/www.scientific.net/AMM.733.288

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 733Investigation on Mechanical Properties and...

Investigation on Mechanical Properties and Microstructures of Resistance Spot Welded Aluminum-Lithium Alloy (5A90)

Abstract:

Three-phase secondary rectification spot welding machine had been adopted to join 5A90 Aluminum-lithium alloy with a thickness of 2 mm, at different welding conditions. The mechanical properties of the lap joints were investigated and microstructure were analyzed respectively. The results showed that the joint fabricated at a welding current of 45.5 kA, welding time of 4 cycles, and electrode pressure of 8.55 kN exhibited higher tensile-shear force value of 7.7 kN compared to the other joints. The nugget were mainly composed of equiaxial grains and cellular dendrites. Meanwhile, equiaxed zone can be divided into the equated dendrites, the wormlike eutectic structure and few equiaxed non-dendrites. The tensile fracture surfaces exhibited a hybrid ductile-brittle fracture, while Al3Li strengthening phase lied in the bottom of dimple.

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Periodical:

Applied Mechanics and Materials (Volume 733)

Pages:

288-291

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.733.288

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Online since:

February 2015

Authors:

Qi Fan, Yi Ping Chen, Dong Hai Cheng

Keywords:

Al-Li, Fracture, Mechanical Properties, Microstructure

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References

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