Comparison of metastable phases induced by heat treatment of unmilled and milled cobalt powders

A. S. Bolokang, M. J. Phasha, S. Bhero

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3 Citations (Scopus)


The sintered and water quenched compact samples were prepared from unmilled and milled Co powders. Characterisation was performed by differential scanning calorimetry, scanning electron microscopy and X-ray diffraction techniques. Several metastable phases were obtained upon sintering and quenching. However, more metastable phases were induced on quenching the milled-sintered samples due to introduction of large number of defects in addition to those induced by milling. Micro hardness values for unmilled sintered samples were the lowest while those of 30 h milled-sintered samples were the highest. The current study reveals that the two FCC metastable phases obtained by quenching unmilled powder were similar to those found in milled-sintered samples.

Original languageEnglish
Pages (from-to)111-115
Number of pages5
JournalInternational Journal of Refractory Metals and Hard Materials
Publication statusPublished - Jan 1 2013


All Science Journal Classification (ASJC) codes

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

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