Abstract
The aluminium-based hybrid metal matrix composites have noteworthy applications in sub-sea installations, structures of deep-sea crawlers, submarine parts, engine cylinders, drum brakes etc., as they possess high strength, corrosion resistance, chemical, and dimensional stability. In this investigation, the pitting corrosion behaviour of friction welded and post-weld heat-treated AA6061/SiC/graphite hybrid composites were analysed. The corrosion rates of AW (as welded), ST (Solution treated), STA (Solution treated and Aged), and AA (Artificially Aged) weld joints were experimentally determined. The corrosion behaviour has been discussed in light of microstructure. The experimental results revealed that the STA joints exhibited better corrosion resistance characteristics as compared to AW, AA, and ST joints. The corrosion rate was high for AW joints, followed by AA and ST joints, respectively. Taking into account the corrosion rates of AW and STA joints, the STA joints have a corrosion rate 34.6% lesser than that of AW joints. A comparison of AA and ST with STA joints reveals that the rate of corrosion for STA joints was 31.1% lesser than that of AA joints and 28.8% lesser than that of ST joints. A lower corrosion rate was observed for STA joints as compared to AA, AW, and ST joints.
Highlights
Aluminium based hybrid metal matrix composites have promising applications in engine cylinder blocks, pistons, disc brakes, aircraft wing panels, etc., as they possess high strength, corrosion resistance, chemical stability, dimensional stability at high temperature [1].Solidification cracking, hot tearing, and fissuring are some common defects observed in fusion joints of aluminium alloys
Sriram Vikas et al studied the influence of post-weld heat treatment (PWHT) and pitting corrosion behaviour of dissimilar aluminium alloy friction stir welds
Eight specimens were subjected to the solution treatment followed by artificial ageing (STA), wherein the solution-treated samples were aged at 163 °C for 8 hours
Summary
Aluminium based hybrid metal matrix composites have promising applications in engine cylinder blocks, pistons, disc brakes, aircraft wing panels, etc., as they possess high strength, corrosion resistance, chemical stability, dimensional stability at high temperature [1]. Sriram Vikas et al studied the influence of post-weld heat treatment (PWHT) and pitting corrosion behaviour of dissimilar aluminium alloy friction stir welds. The corrosion behaviour of AA7075 aluminium alloy friction stirs welds after PWHT has been examined. The composites corrode in a faster manner than the base alloy due to the interface of the reinforcements that result in crevices or pits This could be attributed to the fact that a thin layer of reaction product present at the interface acts as an effective cathode that enables a higher corrosion rate. Sunil sinhmar et al investigated the corrosion behaviour of a friction stir weld joint of AA2014 aluminium alloy. Sara Bocchi et al investigated the influence of process parameters on the corrosion behaviour of friction stir welded aluminium joints. The variance in corrosion potential depends on the number of precipitates and the difference in the composition of constituents [25]
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