Cobalt-Base High-Temperature Alloys

Author:

Sato J.1,Omori T.1,Oikawa K.1,Ohnuma I.1,Kainuma R.1,Ishida K.1

Affiliation:

1. Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.

Abstract

We have identified cobalt-base superalloys showing a high-temperature strength greater than those of conventional nickel-base superalloys. The cobalt-base alloys are strengthened by a ternary compound with the L1 2 structure, \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \({\gamma}^{{^\prime}}\) \end{document} Co 3 (Al,W), which precipitates in the disordered γ face-centered cubic cobalt matrix with high coherency and with high melting points. We also identified a ternary compound, \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \({\gamma}^{{^\prime}}\) \end{document} Ir 3 (Al,W), with the L1 2 structure, which suggests that the Co-Ir-Al-W–base systems with \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \({\gamma}+{\gamma}^{{^\prime}}\) \end{document} (Co,Ir) 3 (Al,W) structures offer great promise as candidates for next-generation high-temperature materials.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference17 articles.

1. R. F. Decker, C. T. Sims, in The Superalloys, C. T. Sims, W. C. Hagel, Eds. (Wiley, New York, 1972), pp. 33–77.

2. C. T. Sims, in The Superalloys, C. T. Sims, W. C. Hagel, Eds. (Wiley, New York, 1972), pp. 145–174.

3. J. M. Blaise, P. Viatour, J. M. Drapier, Cobalt49, 192 (1970).

4. P. Viatour, J. M. Drapier, D. Coutsouradis, Cobalt3, 67 (1973).

5. J. M. Drapier, J. L. de Brouwer, D. Coutsouradis, Cobalt27, 59 (1965).

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