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Superalloys, although not strictly defined, are generally regarded as high-performance alloys based on group VIII elements (nickel, cobalt, or iron, with a high percentage of nickel) to which a multiplicity of alloying elements have been added. The defining feature of a superalloy is its combination of relatively high mechanical strength and surface stability at high operating temperatures. This chapter provides a brief history of the development of superalloys and discusses their use in the gas turbine engines.

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Introduction, Superalloys: Alloying and Performance, By Blaine Geddes, Hugo Leon, Xiao Huang, ASM International, 2010, p 1–8,

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