Design of Ordered Intermetallic Alloys for High-Temperature Structural Use

摘要

Many ordered intermetallic alloys possess attractive high-temperature properties; however, low ductility and brittle fracture restrict their use for structural applications. This paper summarizes the current work on alloy design of ordered intermetallics based on the Ni sub 3 V-Co sub 3 V-Fe sub 3 V and Ni sub 3 Al systems. Both macroalloying and microalloying were used to improve the ductility and fabricability of these alloys. Macroalloying is aimed at controlling ordered crystal sructures and properties in (Ni,Co,Fe) sub 3 V alloys, whereas microalloying is directed toward alleviating both intrinsic and extrinsic grain-boundary weakness in nickel aluminides based on Ni sub 3 Al. Success in development of these ductile intermetallics is discussed, with emphasis on metallurgical principles involved in the alloy design. (ERA citation 09:050096)