Phase Equilibria and Solidification of Mg-Rich Al-Mg-Si Alloys
The solidification and solid-state phase equilibria of four Al-Mg-Si alloys containing 30- 70%Mg and 0.5-3.5%Si, selected on the basis of an isothermal section of the Al-Mg-Si system calculated at 300 °C, have been investigated. Solidification paths of Mg-rich Al-Mg-Si alloys finish on ternary eutectics and the temperatures of two of these eutectic reactions, i.e. L↔(Al)+β+ Mg2Si and L↔(Mg)+γ+ Mg2Si, have been determined to be at ~ 448 °C and ~ 436 °C respectively by DTA. The characteristic temperatures recorded on the DTA curves are analysed and a linear relationship is found between the peak temperature and the square root of the scanning rate.
A Roósz, M. Rettenmayr and Z. Gácsi
R. Valdes, A. Freulon, J.-B. Deschamps, M. Qian, J. Lacaze, "Phase Equilibria and Solidification of Mg-Rich Al-Mg-Si Alloys", Materials Science Forum, Vol. 508, pp. 621-628, 2006