National Research Institute for Metals

Yoko Yamabe

Hiroshi Harada

Yutaka Koizumi

Shizuo Nakazawa

Hideyuki Murakami

Yoshikazu Ro

Toshiharu Kobayashi

Toshihiro Yamagata

Tomohiro Maruko

An iridium-containing nickel-base superalloy which has an orderly arrayed allow structure to be strengthened by precipitation and contains iridium dissolved in the &ggr; and &ggr;&prime; phases to be strengthened by solid solution, thus being improved in high-temperature strength and resistance to high-temperature corrosion. The superalloy can be prepared by adding iridium to a general nickel-base superalloy

Iridium-containing nickel-base superalloy

Refractory superalloys consist essentially of a primary constituent selected from the group consisting of iridium, rhodium, and a mixture thereof, and one or more additive elements selected from the group consisting of niobium, tantalum, hafnium, zirconium, uranium, vanadium, titanium and aluminum, and the superalloys having a microstructure containing an FCC-type crystalline structure phase and an L1.sub.2 -type crystalline structure phase are precipitated. Preferably the amount of additive element(s) is 2 to 22 atom %.

Refractory superalloys

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Ibaraki, Japan

Yoko Yamabe