Structure and transformation behaviour of a rapidly solidified Al-Y-Ni-Co-Pd alloy

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33 Citations (Scopus)

Abstract

An as-solidified structure and transformation behaviour on heating of the rapidly solidified Al-Y-Ni-Co-Pd alloy was studied by X-ray diffractometry (XRD), transmission electron microscopy (TEM), differential scanning and isothermal calorimetries. The Al-Y-Ni-Co-Pd ribbon samples have been produced by the melt spinning technique and heat treated using a differential scanning calorimeter (DSC). The addition of Pd to Al-Y-Ni-Co alloys caused disappearance of the supercooled liquid region as well as the formation of the highly dispersed primary α-Al nanoparticles about 3-7 nm in size homogeneously embedded in the glassy matrix upon solidification. An extremely high density of precipitates of the order of 1024 m-3 is obtained. These particles start growing at the temperature below a glass-transition temperature. The results presented in this paper indicate that some of so-called "marginal" glass-formers in as-solidified state are actually not glassy alloys with pre-existed nuclei but crystal-glassy nanocomposites.

Original languageEnglish
Pages (from-to)78-85
Number of pages8
JournalJournal of Alloys and Compounds
Volume399
Issue number1-2
DOIs
Publication statusPublished - 2005 Aug 16

Keywords

  • Aluminium alloys
  • Differential scanning calorimetry (DSC)
  • Melt spinning
  • Metallic glasses
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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