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Engineering Review : International journal for publishing of original researches from the aspect of structural analysis, materials and new technologies in the field of mechanical engineering, shipbuilding, fundamental engineering sciences, computer sciences, electrical engin, Vol. 41 No. 1, 2021.

Original scientific paper

https://doi.org/10.30765/er.1533

Microstructure and mechanical behavior of similar and dissimilar AA2024 and AA7039 friction stir welds

Chaitanya Sharma ; Rustamji Institute of Technology, BSF Academy, Department of Mechanical Engineering
Vikas Upadhyay ; National Institute of Technology Patna, Department of Mechanical Engineering

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Abstract

In this work, similar and dissimilar friction stir welds of AA2024 and AA7039 were formed using optimized process parameters and truncated threaded tool. Characterization of weld joints for mechanical and microstructural properties was performed by tensile test, micro hardness test, optical microscopy, scanning electron microscopy, and energy dispersive spectrometry. The tensile strength of similar joints was higher than dissimilar joints despite lower microhardness of former. Fracture of FSW joints was found to be started by the fracture of strengthening precipitate θ or η or both in the region of tensile fracture. Dissimilar joints and similar joints of AA7039 exhibited ductile fracture mode while similar joints of AA2024 showed brittle fracture mode.

Keywords

friction stir welding; dissimilar aluminum alloys; characterization; fracture locations; fractography; SEM

Hrčak ID:

244786

URI

https://hrcak.srce.hr/244786

Publication date:

27.9.2021.

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