The Stability of γ ’-Co3(Al,W) Phase in Co-Al-W Ternary System

Abstract:

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The thermodynamic stability ’- Co3(Al,W) phase (L12) in the Co-Al-W ternary system at 900 °C was investigated through microstructure and EPMA analysis on a heat-treated bulk alloy. To promote microstructural evolution, the bulk alloy was cold rolled before heat treatment. By heating at 900 °C, the ’ phase was formed discontinuously in contact with the -Co (A1) phase. With increasing heat treatment time, however, the fraction of ’ phase decreased while that of , CoAl (B2) and Co3W (D019) phases increased. These results are consistent with our previous work with a diffusion-couple method, indicating that the ’ phase is metastable, and the three phases of, CoAl and Co3W are thermodynamically stable at 900 °C.

Info:

Periodical:

Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton

Pages:

448-451

DOI:

10.4028/www.scientific.net/MSF.654-656.448

Citation:

Y. Tsukamoto et al., "The Stability of γ ’-Co3(Al,W) Phase in Co-Al-W Ternary System", Materials Science Forum, Vols. 654-656, pp. 448-451, 2010

Online since:

June 2010

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Price:

$35.00

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