Journal
SCRIPTA MATERIALIA
Volume 110, Issue -, Pages 87-91Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2015.08.007
Keywords
Pre-nucleation clusters; Aluminum alloys; Solidification; Nucleation; Grain growth
Categories
Funding
- National Natural Science Foundation of China [51371109]
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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. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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