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

Journal article

Authors / Editors

Bhero, Shepherd

Research Areas

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Publication Details

Author list: Bolokang AS, Phasha MJ, Motaung DE, Bhero S

Publisher: Elsevier

Place: OXFORD

Publication year: 2012

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

Journal acronym: INT J REFRACT MET H

Volume number: 31

Start page: 274

End page: 280

Number of pages: 7

ISSN: 0263-4368

Languages: English-Great Britain (EN-GB)

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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 eta-phase with 11.037 angstrom 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 angstrom was detected. Upon annealing a 30 h milled Co powder compact at 800 degrees C, two metastable FCC phases with lattice parameters of 3.506 angstrom and 4.162 angstrom were obtained. For milled, annealed and water-quenched W at 1000 degrees C, metastable FCC phases with a=3.510 angstrom and 4.177 angstrom were obtained. Furthermore, metastable HCP phase with a=2.731 angstrom; c=4.319 angstrom was detected after annealing of milled W at 1000 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.

Keywords

DSC, Eta-phase, Mechanical milling, Metastable, XRD

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