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Science 7 April 2006:
Vol. 312. no. 5770, pp. 90 - 91
DOI: 10.1126/science.1121738
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Reports

Cobalt-Base High-Temperature Alloys

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

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 L12 structure, Formula Co3(Al,W), which precipitates in the disordered {gamma} face-centered cubic cobalt matrix with high coherency and with high melting points. We also identified a ternary compound, Formula Ir3(Al,W), with the L12 structure, which suggests that the Co-Ir-Al-W–base systems with Formula (Co,Ir)3(Al,W) structures offer great promise as candidates for next-generation high-temperature materials.

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

* To whom correspondence should be addressed. E-mail: ishida{at}material.tohoku.ac.jp

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Science. ISSN 0036-8075 (print), 1095-9203 (online)