Cobalt-Base High-Temperature Alloys
2006
Sato, J. | Omori, T. | Oikawa, K. | Ohnuma, I. | Kainuma, R. | Ishida, K.
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, gamma' 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, gamma' Ir₃(Al,W), with the L1₂ structure, which suggests that the Co-Ir-Al-W-base systems with gamma+gamma' (Co,Ir)₃(Al,W) structures offer great promise as candidates for next-generation high-temperature materials.
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