Cobalt-Base High-Temperature Alloys

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Science  07 Apr 2006:
Vol. 312, Issue 5770, pp. 90-91
DOI: 10.1126/science.1121738

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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, Math 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, Math Ir3(Al,W), with the L12 structure, which suggests that the Co-Ir-Al-W–base systems with Math (Co,Ir)3(Al,W) structures offer great promise as candidates for next-generation high-temperature materials.

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