Why Does an Al-17Si Alloy Solidify Over a Range of Temperatures?

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An Al-17Si alloy solidifies over a range of temperatures due to the presence of multiple phases, unlike pure metals that solidify at a specific temperature. The growth of primary silicon occurs after undercooling, continuing until the eutectic arrest temperature is reached. This behavior is attributed to the varying equilibrium phase content in hypo-eutectic compositions as temperature changes. The discussion highlights the complexity of alloy solidification and the influence of composition on cooling curves. Understanding these principles is essential for predicting the solidification behavior of aluminum-silicon alloys.
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Why does an alloy solidify over a range of temperature unlike a pure metal.
Consider Al-17Si alloy.
Growth of primary Si after undercooling does not take place at liquidus temperature but temperature keeps on decreasing until it reaches eutectic arrest temperature. I am not able to understand why p-Si being one component phase has a different cooling curve compared to its pure alloy( pure Si).
 
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It's not clear what you're referring to. Are you talking about equilibrium cooling of a hypo-eutectic composition, where the equilibrium phase content varies with temperature?
 

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