Phase equilibria in aluminum-rich Al-Sc-Si alloys during solidification

Differential thermal and metallographic analyses are used to study the alloys lying on the sections of the phase diagram opposite to the Al corner and passing across the binary alloy compositions Al-2.5% Sc-Al-7% Si and Al-5% Sc-Al-14% Si. These results are used to plot two vertical sections and part of the liquids surface of the Al-Sc-Si phase diagram from the Al corner to 5% Sc and 14% Si. The character and temperatures of invariant equilibria in aluminum-rich alloys of the Al-Sc-Si system are determined.