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The progressive development of the metal palette in high-temperature superalloys (reprinted from ref. 2, which, in turn, was adapted from ref. 34). Reprinted with permission of ASM International. All rights reserved (www.asminternational.org). The maximum alloy operating temperature is the highest temperature at which the alloy maintains satisfactory physical properties for at least 100 h at 140-MPa pressure (2), without the use of aids like thermal coatings or cooling mechanisms.
