Abstract
Effects of Si content and the presence of various minor elements, e.g. Mg, Ti, Sr and P, on the latent heat of Al-Si alloys have been analysed by the CA-CCA method. The results indicate that the latent heat of Al-Si alloys increases with increasing Si content. For hypo-eutectic and eutectic alloys, Sr-modified and Ti-grain refined alloys release more latent heat than non-treated alloys. However, for hyper-eutectic alloys, the latent heat values are lower for P-refined and Ti-grain refined alloys than for non-treated alloys. In addition, the introduction of Mg into Al-Si alloys increases the latent heat. Linear and higher order regression formulae for fitting the latent heat with Si content have been obtained in this study. The results of the measured latent heat through both the CA-CCA method and the DTA method and the theoretical latent heat values calculated by the simple mixture rule have been compared.Furthermore, the changes in solid fraction during solidification of Al-Si alloys with various compositions have also been determined by the CA-CCA method by taking into account the difference in latent heat between the Al and Si phases. Finally, the fluidity lengths of Al-Si(Mg) alloys have been related to latent heat, percent eutectic and superheat.
Published Version
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