The results of thermal derivative analysis (TDA), differential scanning calorimetric (DSC) measurements and microstructure investigations of commercial AZ91 magnesium alloy are presented. The performed examinations allowed to determine the microstructure after solidification process and also precipitation process during continuous heating of supersaturated solid solution. The [alpha]-phase and [alpha]+[gamma] semi-divorced eutectic were observed in as-cast material, whereas both discontinuous and continuous precipitates of [gamma] phase were revealed after heating supersaturated AZ91 alloy.
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