A detailed picture is presented of the physical and chemical phenomena that affect the behavior of cobalt-base superalloys. Solid-solution strengthening is obtained from the high-melting metallic elements molybdenum, tungsten, tantalum, and columbium. These elements also participate in precipitation reactions involving their carbides. Precipitation of intermetallic compounds such as Ni3Ti is an important process in cobalt alloys containing appreciable amounts of nickel and titanium. The relationships among microstructure, heat treatment, and mechanical properties of the important commercial alloys are considered, and whenever possible, explained on the basis of the physical and chem cal processes that occur. (Author).

Soviet nickel-base and cobalt-base alloys for high-temperature operation are described. Wrought and cast turbine blading alloys are included, as well as oxidation-resistant sheet alloys. Mechanical and physical properties of each alloy are assembled, and a detailed list of references is presented. Where possible, the specific applications are noted. It was concluded that the Soviets have made significant contributions to superalloy development, having successfully circumvented a shortage of cobalt and molybdenum. (Author).

The proceedings of this symposium from the 1999 TMS Annual Meeting & Exhibition examine the effects of long-term thermal exposure and long-term service conditions on the microstructure and properties of high-temperature structural materials. A significant number of paper address nickel-based superalloys, elevated-temperature stability of intermetallic alloys, refractory metal alloys, composites, and titanium alloys. Also included are discussions on determining the degree and mechanism of property degradation, correlating laboratory exposure with actual service life, and analyzing properties and methods of component/property refurbishment.