Pre-nucleation clusters mediated crystallization in Al-Si melts

Yue Liu, Yong Zhang, Wenhui Yu, Xuetao Wang, Hongliang Zheng, Xuelei Tian

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11 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)87-91
Number of pages5
JournalScripta Materialia
Volume110
DOIs
Publication statusPublished - 1 Jan 2016
Externally publishedYes

Keywords

  • Aluminum alloys
  • Grain growth
  • Nucleation
  • Pre-nucleation clusters
  • Solidification

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