Derivative thermal (ATD) and microstructure analyses of gravity cast AZ91 magnesium alloy are presented. The alloy was cast into cold steel and sand moulds with the same dimensions. ATD curves - solidification curves and their first derivative - are presented. The investigated alloy exhibited a strong alloying elements segregation and the presence of [alpha] solid solution and [alpha+gamma] (Mg17Al12) eutectic mixture. Discontinuous precipitates of [gamma] phase were also observed in the microstructure of AZ91 cast into sand mould.
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