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

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SUMMARY

The Al-17Si alloy solidifies over a range of temperatures due to the presence of multiple phases during the cooling process. Unlike pure metals, which solidify at a specific temperature, the growth of primary silicon (p-Si) in this alloy occurs after undercooling and continues until reaching the eutectic arrest temperature. This behavior is attributed to the equilibrium cooling of hypo-eutectic compositions, where the equilibrium phase content varies with temperature, leading to a distinct cooling curve compared to pure silicon.

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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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