Abstract
The precipitation hardening of alloys is one of the important strengthening mechanisms responsible for altering the mechanical properties. In terms of improving strength by age hardening, aluminium is an outstanding primary alloying element because of its low cost, availability, and low density. The impact of ageing temperature from 150 to 250 °C on the hardness and precipitate formation of AZ61 magnesium alloy was examined in this study. The microstructural features and mechanical properties of the AZ61 alloy were characterized using optical microscopy, Vickers Microhardness, and scanning electron microscopy (SEM). The results show that Mg17Al12 is the only continuous precipitate in aged AZ61 samples at each temperature and can be discriminated by their plate or rod-shaped morphologies. An increase in ageing temperature leads to a decrease in hardness values. The results show that the hardness values at 150 °C are significantly higher than those of samples aged at 200 °C and 250 °C. It can be attributed to the small interparticle spacing between the precipitates at an ageing temperature of 150 °C.
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