Superalloy

♤ A superalloy (high-performance alloy) is an alloy that exhibits excellent mechanical strength and resistance to creep (tendency for solids to slowly move or deform under stress) at high temperatures; good surface stability; and corrosion and oxidation resistance

♤ A superalloy's base alloying element is usually nickel, cobalt, or nickel-iron

♤ Superalloys develop high temperature strength through solid solution strengthening. Oxidation or corrosion resistance is provided by elements such as aluminium and chromium.

♤ Applications of superalloys include: gas turbines (commercial and military aircraft, power generation, and marine propulsion); space vehicles; submarines; nuclear reactors; military electric motors; racing and high-performance vehicles, chemical processing vessels, bomb casings. eg.turbine blades for hot sections of jet engines, and bi-metallic engine valves for use in diesel and automotive applications

♤ Examples of superalloys are Hastelloy, Inconel (e.g. IN100), Waspaloy, Rene alloys (e.g. Rene 41, Rene 80), Haynes alloys, Incoloy, MP98T, TMS alloys, and CMSX (e.g. CMSX-4) single crystal alloys.

Part D : Not So important Topics