Abstract
Currently, Al-Si alloy is one of the most widely studied aluminum alloy for the phase change thermal storage materials which can be used in solar thermal power generation. However, there still exist some problems to be solved on Al-Si alloy in the present researches. For instance, the latent heat of Al-20%Si alloy is lower than that of Al-12%Si alloy in some papers while the an opposite conclusion was draw in other papers. To solve this problem, five kinds of Al-Si alloy were designed in this investigation, and the mass fraction of silicon was 4%, 8%, 12%, 16% and 20% respectively. The latent heat value of these alloys was determined using an SII TG/DTA 6300 differential thermal analyzer. According to the phase diagram and photomicrographs as well as the measured values, the quantitative expression of the relationship between alloy composition and the latent heat of Al-Si alloy were obtained. And the two quantitative relational expressions (Y1=13.14x+372.05 for the hypoeutectic alloy and Y2=-4.72x+599.01 for the hypereutectic alloy) were validated through the determination of latent heat of Al-6%Si alloy and Al-14%Si alloy.
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