Abstract
The solidification paths of Al-Ge-Si ternary alloy under the conditions of the equilibrium and non-equilibrium solidification were analyzed on the basis of the thermodynamic calculation. Subregular solution model was used to describe the Gibbs free energy of the ternary solution phases such as liquid, fcc and diamond structure phases. The excess free energy of the ternary solution phases were calculated from the interaction parameters of the three binarysystems which construct the ternary system. In order to confirm the validity of the calculation, thermal analysis of Al-25.5%Ge-16.0%Si ternary alloy was carried out and the Ge content of primary crystals in the solidified alloy was measured by an electron probe micro analyzer. As a result, the measured Ge content agreed well with the calculated one, and the measured temperatures at the start of solidification, the start of eutectic reaction and the end of solidification corresponded completely with the calculated non-equilibrium solidification path.
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