Factors Affecting Differential Scanning Calorimetry Curve of Cast Aluminum Alloy and Application of Curve

The differential scanning calorimetry (DSC) curves of 6082 cast aluminum alloy with the same sample weight and different heating rates and 6016 cast aluminum alloy with the same heating rate and different sample weights were measured, and the shape of each peak value of the curve and the change of corresponding temperature were compared and analyzed. The results show that when the heating rate is in the range of 2~40 ℃·min^-1, with the increase of heating rate, the peak area of DSC curve of cast aluminum alloy increases, the peak temperature obviously shifts to high temperature, and the separation ability of adjacent endothermic peaks decreases. The slower the heating rate, the smaller the peak area of DSC curve is, which is conducive to the separation of adjacent endothermic peaks and is not conducive to the appearance of smaller endothermic peaks. At the heating rate of 10 ℃·min^-1, with the increase of sample weight, the endothermic peak on the DSC curve of cast aluminum alloy shifts to high temperature, the change of starting point temperature is less than that of peak temperature, and the area of endothermic peak also increases. The extrapolation starting point temperature of endothermic peak in DSC curve has the most guiding significance in practical application, which reflects the internal properties of material transformation and is not affected by heating rate and sample weight.