Grain refinement in solidification of highly undercooled eutectic Ni-Si alloy

Yiping Lu, Feng Liu, Gencang Yang, Haipeng Wang, Yaohe Zhou

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Substantial undercooling up to 550 K (0.386TE, with TE as the melting point) was achieved in eutectic Ni78.6Si21.4 alloy melt using glass fluxing combined with cyclic superheating. Accordingly, a particular refined microcrystalline morphology is obtained in the as-solidified structure. The physical mechanism of the grain refinement subjected to high undercooling is interpreted in terms of the classical nucleation theory and LKT/BCT model. It was concluded that the above refinement can be ascribed to the substantially increased nucleation rate under high undercooling.

Original languageEnglish
Pages (from-to)987-990
Number of pages4
JournalMaterials Letters
Volume61
Issue number4-5
DOIs
StatePublished - Feb 2007

Keywords

  • Grain refinement
  • Microstructure
  • Solidification
  • Undercooling

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