Cobalt-Base High-Temperature Alloys
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 L12 structure, γ' Co3(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, γ' Ir3(Al,W), with the L12 structure, which suggests that the Co-Ir-Al-W-base systems with γ + γ' (Co,Ir)3(Al,W) structures offer great promise as candidates for next-generation high-temperature materials.
- Publication:
-
Science
- Pub Date:
- April 2006
- DOI:
- 10.1126/science.1121738
- Bibcode:
- 2006Sci...312...90S
- Keywords:
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- MAT SCI