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

doi:10.1016/j.ijrmhm.2011.12.012

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

Chemical, Materials & Metallurgical Engineering

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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 language	English
Pages (from-to)	274-280
Number of pages	7
Journal	International Journal of Refractory Metals and Hard Materials
Volume	31
DOIs	https://doi.org/10.1016/j.ijrmhm.2011.12.012
Publication status	Published - Mar 1 2012

All Science Journal Classification (ASJC) codes

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

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10.1016/j.ijrmhm.2011.12.012

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title = "Metastable phases in the Co-W system traced from elemental Co and W powders",

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 {\AA} 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 {\AA} was detected. Upon annealing a 30 h milled Co powder compact at 800 °C, two metastable FCC phases with lattice parameters of 3.506 {\AA} and 4.162 {\AA} were obtained. For milled, annealed and water-quenched W at 1000 °C, metastable FCC phases with a = 3.510 {\AA} and 4.177 {\AA} were obtained. Furthermore, metastable HCP phase with a = 2.731 {\AA}; c = 4.319 {\AA} was detected after annealing of milled W at 1000 °C.",

author = "Bolokang, {A. S.} and Phasha, {M. J.} and Motaung, {D. E.} and S. Bhero",

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T1 - Metastable phases in the Co-W system traced from elemental Co and W powders

AU - Bolokang, A. S.

AU - Phasha, M. J.

AU - Motaung, D. E.

AU - Bhero, S.

PY - 2012/3/1

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N2 - 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.

AB - 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.

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