Effect of Solution Treatment Temperature on Recycled Aluminium Alloy 319

Abstract

In the present work, the responses of artificial ageing process to different solutionising temperatures on recycled 319 series aluminium alloy are studied. The optimisation of solutionising temperature may lead to the formation of higher volumes of precipitates in the aluminium alloy during the artificial ageing process, which means the greater strength to the alloy. The aluminium alloy samples were sectioned from recycled automotive cylinder head and solutionised at three different solutionising temperatures, stated as 495°C, 510°C and 525°C for 10 hours. All samples were then artificially aged at 180°C for a period of 20 hours. The precipitation behaviour was monitored by Vicker’s microhardness test and electrical resistivity measurement. The result showed that all solutionising temperature produced double peaks on the artificial ageing hardness profiles but at different ageing time. The similar trend was also observed by the resistivity measurement.