Nanocrystallization studies of a melt-quenched Ni81P19 amorphous alloy

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Abstract

Differential scanning calorimetry (DSC) and high-resolution X-ray diffraction (XRD) measurements were performed on a melt-quenched Ni81P19 amorphous alloy and on its nanocrystalline version obtained by isothermal annealing. The average grain size was derived from XRD line broadening. From the DSC measurements, the heat evolved during the amorphous-crystalline, amorphous-nanocrystalline and nanocrystalline-crystalline transformations were determined. An isothermal annealing of the Ni81P19 amorphous alloy, performed 30 K below the peak temperature of the amorphous-crystalline transformation resulted in a grain size of about 10 nm. Increasing the temperature of the isothermal annealing resulted in a slight increase in the nanocrystalline grain size A linear-heating DSC scan of this nanocrystalline state revealed a broad exothermic contribution between 600 and 770 K, corresponding to a grain growth process with a final grain size of 70 nm. Correspondingly, the exothermal heat of the nanocrystalline-crystalline transformation decreased with increasing nanocrystalline grain size. Isothermal annealing of the nanocrystalline alloy indicated normal grain-growth at low annealing temperature and an abnormal grain-growth process could be observed with increasing annealing temperatures.

Original languageEnglish
Pages (from-to)499-504
Number of pages6
JournalMaterials Science Forum
Volume312
Publication statusPublished - Jan 1 1999
EventProceedings of the 1998 International Symposium on Metastable, Mechanical Alloyed and Nanocrystalline Materials, ISMANAM-98 - Wollongong, Sydney, Aust
Duration: Dec 7 1998Dec 12 1998

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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