title: 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 L1(2) 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 L1(2) 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.
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Sato
authors.forename: T
authors.initials: T
authors.lastname: Omori
authors.forename: K
authors.initials: K
authors.lastname: Oikawa
authors.forename: I
authors.initials: I
authors.lastname: Ohnuma
authors.forename: R
authors.initials: R
authors.lastname: Kainuma
authors.forename: K
authors.initials: K
authors.lastname: Ishida