Cobalt-Base High-Temperature Alloys

Cobalt-Base High-Temperature Alloys by J. Sato et al. Science, 7 Apr 2006 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 prime} 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 {gamma + gamma prime} (Co,Ir)₃(Al,W) structures offer great promise as candidates for next-generation high-temperature materials. Read more