Phase Equilibria and Solidification of Mg-Rich Al-Mg-Si Alloys

Abstract:

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.

• Periodical: Materials Science Forum (Volume 508)
• Pages: 621-628
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.508.621
• Online since: March 2006
• Authors: R. Valdes, A. Freulon, J.-B. Deschamps, Ma Qian, Jacques Lacaze
• Keywords: Al-Mg-Si Alloy, Differential Thermal Analysis (DTA), Phase Equilibria, Solidification

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