Chiang Mai Journal of Science

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The paper presents an experimental study on precipitation of  aluminium alloy 6061-T6 to determine the effect of  artificial ageing on the hardness of  aluminium alloy 6061-T6. The precipitation hardening is a thermal treatment, which consists of  a heat treatment, quenching and artificial ageing process. The experimental study is focused on artificial ageing upon which the temperature is varying between 175^oC to 420^oC at different period of  time. The Vickers hardness test is to evaluate the hardness of  aluminium alloy 6061-T6 before and after ageing process. The optimum ageing time and temperature is determined at the end of this experiment to obtain reduction in energy and total cost. The study leads to the conclusion that the optimum aged was achieved between 175^oC to 195^oC with 2 to 6 hours of  ageing time. The contribution of  short time ageing is comparable to that of  longer ageing time from previous studies

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