Structure and thermal stability of a melt-quenched single-phase nanocrystalline Hf61Fe39 alloy

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3 Citations (Scopus)

Abstract

The formation of a single-phase nanocrystalline Hf61Fe 39 alloy with the fcc-Hf2Fe structure was achieved in a single step by melt-quenching, similarly to the previously reported nanocrystalline HfNi5 phase in a melt-quenched Hf11Ni 89 alloy. Structural studies by X-ray diffraction and transmission electron microscopy have been performed for the nanocrystalline Hf 61Fe39 alloy in both the as-quenched state and after various heat treatments. It was found that the as-quenched state exhibits an average grain size of about 50 nm and a lattice parameter remarkably lower than the value known for the stoichiometric fcc-Hf2Fe phase. Differential scanning calorimetry has been used to reveal phase transformations and to establish the heat evolution and activation energy of transformation. The nanocrystalline Hf61Fe39 alloy shows high thermal stability with an activation energy of 1.29 eV corresponding to a grain growth above 800 K.

Original languageEnglish
Pages (from-to)874-878
Number of pages5
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Volume96
Issue number8
DOIs
Publication statusPublished - Aug 2005

Keywords

  • Nanocrystalline state
  • Rapid solidification
  • Thermal stability
  • Transmission electron microscopy
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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