
A superalloy, or 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. Superalloys typically have a matrix with an austenitic face-centered cubic crystal...
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http://en.wikipedia.org/wiki/Superalloy

(from the article `materials science`) These advances in processing have been accompanied by the development of new `superalloys.` Superalloys are high-strength, often complex alloys that ... Nonferrous alloys categorized under the name superalloys or nimonics account for about 3 percent of the total demand for molybdenum. The...
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http://www.britannica.com/eb/a-z/s/187

superalloy An alloy, often with a nickel, nickel-iron, or cobalt base, capable of withstanding very high temperatures, used in jet engines, rockets, etc.
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http://www.wordinfo.info/words/index/info/view_unit/1185/3

An alloy developed for very high temperature service where relatively high stresses (tensile, thermal, vibratory, and shock) are encountered and where oxidation resistance is frequently required.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/

An alloy developed for very high temperature use where relatively high stresses are encountered and where oxidation resistance is needed.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/

an alloy, often with a nickel, nickel-iron, or cobalt base, capable of withstanding very high temperatures, used in jet engines, rockets, etc.
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https://www.infoplease.com/dictionary/superalloy

An alloy developed for very high temperature use, where relatively high stresses are encountered, and where oxidation resistance is needed.
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https://www.metaltek.com/resources/glossary/

An alloy developed for very high temperature service where relatively high stresses
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https://www.unifiedalloys.com/resources/glossary/
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