Cobalt-base alloy with high heat resistance and high...

Details Cobalt-base alloy with high heat resistance and high... Cobalt-base alloy with high heat resistance and high...

C - Chemistry, Metallurgy

22

C

C22C 19/07 (2006.01) C22F 1/10 (2006.01) C22F 1/00 (2006.01)

Patent

CA 2620606

A cobalt-base alloy which has a basic composition comprising, in terms of mass proportion, 0.1-10% Al, 3.0-45% W, and Co as the remainder and has an intermetallic compound of the L12 type [Co3(Al,W)] dispersed and precipitated therein. Part of the Co may be replaced with Ni, Ir, Fe, Cr, Re, or Ru, while part of the Al and W may be replaced with Ni, Ti, Nb, Zr, V, Ta, or Hf. The intermetallic compound [Co3(Al,W)] has a high melting point, and this compound and the matrix are mismatched little with respect to lattice constant. Thus, the cobalt-base alloy can have high-temperature strength equal to that of nickel-base alloys and excellent structure stability.

Alliage à base de cobalt lequel a une composition de base comprenant, en termes de proportion en poids, 0,1-10 % d'Al, 3,0-45 % de W et Co pour le reste et lequel a un composé intermétallique du type L12 [Co3(Al,W)] dispersé et précipité dans celui-ci. Une partie du Co peut être remplacée par Ni, Ir, Fe, Cr, Re ou Ru, alors qu'une partie du Al et du W peut être remplacée par Ni, Ti, Nb, Zr, V, Ta ou Hf. Le composé intermétallique [Co3(Al,W)] a un point de fusion élevé et le composé et la matrice sont peu dépareillés en termes de constante de réseau cristallin. Ainsi, l'alliage à base de cobalt peut avoir une résistance à haute température égale à celle d'alliages à base de nickel et une excellente stabilité de la structure.

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