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Here is a nice introduction and overview of superalloys.
http://www.msm.cam.ac.uk/phase-trans/2003/Superalloys/superalloys.html
Nickel Based Superalloys
H. K. D. H. Bhadeshia
See also - http://www.msm.cam.ac.uk/phase-trans/2003/nickel.html
http://www.msm.cam.ac.uk/phase-trans/2003/Superalloys/superalloys.html
Nickel Based Superalloys
H. K. D. H. Bhadeshia
Lots of other pages at the bottomA superalloy is a metallic alloy which can be used at high temperatures, often in excess of 0.7 of the absolute melting temperature. Creep and oxidation resistance are the prime design criteria. Superalloys can be based on iron, cobalt or nickel, the latter being best suited for aeroengine applications.
The essential solutes in nickel based superalloys are aluminium and/or titanium, with a total concentration which is typically less than 10 atomic percent. This generates a two-phase equilibrium microstructure, consisting of gamma (γ) and gamma-prime (γ'). It is the γ' which is largely responsible for the elevated-temperature strength of the material and its incredible resistance to creep deformation.
See also - http://www.msm.cam.ac.uk/phase-trans/2003/nickel.html