Allegheny D-979 is an austenitic, high-temperature superalloy for aircraft gas turbine applications. It responds to a precipitation hardening heat treatment. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-61. Producer or source: Allegheny Ludlum Corporation.