Nickel based superalloys are often used in jet engines and even on the space shuttle. Almost any time when strength and crack resistance is needed at very high temperatures a Nickle based superalloy is used.
Used for similar purposes as Nickle based alloys, as well as many magnetic uses. However, it cannot be used in conjunction with nuclear power.
Iron based superalloys are used for very much the same purpose, however, iron based alloys are use primarily for situations that require very high strength, but not necesarrily high temperature shock resistance.
