Nanoscale phase separation and microstructure evolution during crystallization in Al-Si-Ni amorphous alloy

J. I. Hyun, C. I. Kim, S. W. Nam, W. T. Kim, D. H. Kim

Research output: Contribution to journalArticle

Abstract

Phase separation and crystallization behavior in melt-spun Al63Si25Ni12 amorphous alloy have been investigated in the present study. Although there is no atomic pair with positive enthalpy of mixing, nm scale phase separation occurs in the as-melt-spun amorphous alloy, exhibiting double-halo diffraction pattern. The amorphous matrix consisting of two different nm-scale Al-rich and Si-rich amorphous phases polymorphically crystallizes into a metastable hexagonal phase by an interface-controlled nucleation and growth mechanism in the first step of crystallization. The metastable hexagonal phase transforms into the mixture of α-Al, Si and Al3Ni phases possibly by a ternary eutectoid reaction in the second step of crystallization.

Original languageEnglish
Article number108719
JournalMaterials and Design
Volume192
DOIs
Publication statusPublished - 2020 Jul

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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