Formation of Nanocrystalline Phases during Thermal Decomposition of Amorphous Ni-P Alloys by Isothermal Annealing

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Abstract

The microstructure and the average grain size were investigated by x-ray diffraction and transmission electron microscopy for nanocrystalline (n) Ni-P alloys with 18, 19, and 22 at.% P. A detailed study of the nanocrystalline states obtained along different heat treatment routes has been performed: (1) a → n i by isothermal annealing of the melt-quenched amorphous (a) Ni-P alloys; (2) n i → n ii by isothermal annealing of the nanocrystalline n, state; (3) n i → n ii by linear heating of the n; state. The heats evolved during the structural transformations were determined by differential scanning calorimetry. From these studies, a scheme of the structural transformations and their energetics was constructed, which also includes previous results on phases obtained by linear heating of the as-quenched amorphous state of the same alloys. Grain boundary energies also have been estimated. In some cases it was necessary to assume a variation of the specific grain boundary energy during the phase transformation to understand the enthalpy and microstructure changes during the different heat treatments.

Original languageEnglish
Pages (from-to)191-200
Number of pages10
JournalJournal of Nanoscience and Nanotechnology
Volume1
Issue number2
DOIs
Publication statusPublished - Dec 1 2001

Keywords

  • Differential Scanning Calorimetry.
  • Isothermal Annealing
  • Nanocrystalline Phases
  • Ni-P Alloys
  • Transmission Electron Microscopy
  • X-ray Diffraction

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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