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

Journal article

Authors/Editors

Bhero, Shepherd

Research Areas

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Publication Details

Author list: Bolokang AS, Phasha MJ, Bhero S

Publisher: Elsevier

Place: OXFORD

Publication year: 2013

Journal: International Journal of Refractory Metals and Hard Materials (0263-4368)

Journal acronym: INT J REFRACT MET H

Volume number: 36

Start page: 111

End page: 115

Number of pages: 5

ISSN: 0263-4368

Languages: English-Great Britain (EN-GB)

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Abstract

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. (c) 2012 Elsevier Ltd. All rights reserved.

Keywords

cobalt, Mechanical milling, Metastable phases, Water quenching, XRD

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