Title: Pre-nucleation clusters mediated crystallization in Al–Si melts
Abstract: Triggered by exogenous local ordering structures, pre-nucleation clusters appear in Al–Si melts and significantly alter the crystallization process. In absence of potent nucleating substrates (in high-purity melts), they delay silicon crystal nucleation, otherwise (in commercial-purity melts), they enhance nucleation and growth as well as change the growth mechanism of silicon. This makes the silicon grain size a competition result of nucleation and growth processes and some empirical rules of classical nucleation unreliable, e.g., easy nucleation no longer means grain-refined microstructures. These phenomena are further explained by characterizing the remains of these pre-nucleation clusters in solidified alloys.
Publication Year: 2015
Publication Date: 2015-08-22
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 16
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