Abstract
ABSTRACT In the present work, a thermally stable as-cast Mg-6wt% Al-3wt% Sn (AT63) and a commercial AZ series Mg-6wt% Al-3wt% Zn (AZ63) magnesium alloy were developed to study age-hardening behavior. Age-hardening behavior was compared at temperatures between 200°C and 350°C for a prolonged period. The former alloy AT63 has two precipitates, Mg17Al12 and Mg2Sn, showing a poor ageing profile, whereas the latter has only Mg17Al12 precipitate and significant age hardening. Scanning electron microscopy (SEM) was used to observe precipitate formation in the aged samples of both alloys under the same annealing conditions. It was concluded that adding Sn to Mg-6Al alloy slows down the formation of Mg17Al12 and consequently reduces the ageing effect, though it aids in forming a new precipitate Mg2Sn.
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