Abstract Development of materials for structural applications at elevated temperatures in aeroengines has encouraged research on intermetallic alloys. A select group of aluminides and silicides has shown significant promise for high temperature structural applications owing to their high melting temperatures, as well as their ability to retain strength and oxidation resistance at elevated temperatures. In recent years the focus is on multiphase multicomponent intermetallic alloys with significant volume fractions of ductile constituents to achieve an optimum combination of toughness and elevated temperature strength. The engineering properties and actual or potential aerospace applications of the currently most important structural intermetallics, the nickel, iron, and titanium aluminides, are concisely discussed.


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