Metastable phases in the Co-W system traced from elemental Co and W powders

A. S. Bolokang, M. J. Phasha, D. E. Motaung, S. Bhero

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Abstract

X-ray diffraction technique was used to identify the phases of the milled and annealed elemental Co, W and Co-W powder mixture. Structural similarities in metastable phases of elemental Co and W have been obtained. The η-phase with 11.037 Å was detected in both milled and annealed W as well as in the Co-W alloy. In addition, metastable FCC Co (W) solid solution of 3.544 Å was detected. Upon annealing a 30 h milled Co powder compact at 800 °C, two metastable FCC phases with lattice parameters of 3.506 Å and 4.162 Å were obtained. For milled, annealed and water-quenched W at 1000 °C, metastable FCC phases with a = 3.510 Å and 4.177 Å were obtained. Furthermore, metastable HCP phase with a = 2.731 Å; c = 4.319 Å was detected after annealing of milled W at 1000 °C.

Original languageEnglish
Pages (from-to)274-280
Number of pages7
JournalInternational Journal of Refractory Metals and Hard Materials
Volume31
DOIs
Publication statusPublished - Mar 1 2012

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All Science Journal Classification (ASJC) codes

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

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