Email this article Effect of Post Weld Heat Treatment On Micro Structure & Corrosion Behavior Of Aa 7075 Friction Stir Welds
Abstract
Aluminum AL7075 alloy is an attractive option for aerospace components in naval and defence applications due to its corrosion resistance and absence of melting related problems. This project reports the effects of post weld heat treatments, namely Peak age treatment and Retrogression and reaging on microstructure and mechanical properties of 12 mm thick friction stir welded joints of high strength AA7075 aluminum alloy. Welds were characterized for metallo graphy to carry out the micro structural studies using Optical Microscopy, hardness measurements were done using Vickers hardness tester. Potentio-dynamic polarization tests were carried out to determine the pitting corrosion behavior done using a basic electrochemical system. The results show that welds under peak age treatment (T-6) exhibit better mechanical properties compared to RRA treatment. Welds under Retrogression and reaging exhibit better corrosion resistance with marginal decrease in strength and which is attributed to the micro structural changes observed in both the weld joints.
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