Microstructure,microhardness and corrosion susceptibility of friction stir welded AlMgSiCu alloy |
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| Affiliation: | 1. Neurovascular Hypertension & Kidney Disease Laboratory, Baker IDI Heart & Diabetes Institute, Melbourne, Australia;2. Heart Centre Alfred Hospital, Melbourne, Australia;3. Monash Centre of Cardiovascular Research and Education in Therapeutics, School of Public Health & Preventive Medicine, Monash University, Melbourne Australia;1. Friction Stir Welding Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, 721302, India;2. Department of Mechanical Engineering, Indian Institute of Technology Bhilai, 492015, India;3. Department of Mechanical Aerospace and Civil Engineering, The University of Manchester, M13 9PL, UK |
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| Abstract: | Microstructure, microhardness and corrosion susceptibility of friction stir welded joint in an AlMgSiCu alloy were investigated. It was found that the joint exhibits different corrosion susceptibility among the microstructural zones. The base material is the most susceptible to intergranular corrosion because of the presence of continuous cathodic precipitates (Si and Q phases) at grain boundaries and the precipitate free zone along the grain boundaries. The coarsening of intergranular precipitates and the precipitation of Q′ phases in the grain bodies reduce intergranular corrosion susceptibility but introduce pitting corrosion in the heat-affected zone. The significant elimination of intergranular corrosion both in nugget zone and thermo-mechanically affected zone is related to the low volume fraction of intergranular precipitate. Microhardness variations depend on the evolution of intragranular precipitates. The dissolution and/or coarsening of the strengthening precipitates result in the softening within the welded zone. |
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| Keywords: | Friction stir welding Aluminium alloy Intergranular corrosion Precipitation |
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