Abstract
An improved method is presented for determination of solidification curves, i.e., fraction solid vs temperature, for commercial Mg alloys using heat-transfer model (HTM) differential scanning calorimetry (DSC) curves. A better evaluation of the measured DSC heat flow signal is attained through an independent measurement of the time constant as a function of temperature for the applied equipment. A further improvement is achieved through a more impartial interpretation of the measured DSC curves. Both improvements enable a better desmearing of the DSC signal and reduce the error induced by the operator. Challenging Mg alloys could be appropriately handled by optimizing the tantalum encapsulation. Highly reproducible DSC-HTM solidification curves are determined for seven Mg alloys of the AZ and AM series. The results indicate a potential of this method for simple, fast, and reliable determination of solidification curves even for such very reactive alloys with high vapor pressure.
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