| Abstract Scope |
The recently recognized existence of the ternary L12 intermetallic Co3(Al,W), not observed in the constituent Co-Al, Al-W or Co-W binaries, has opened up opportunities for design of a new class of high temperature superalloys. Advances in Ni-base superalloys, which have been the subject of decades of alloy development, have been synonymous with advances in the performance and efficiency in aircraft and power-generation turbines, rocket engines, fuel cells and nuclear power plants. Given that Ni-base superalloys are chemically complex, often containing 6 – 10 “major” alloying elements along with 3 – 5 “minor” elements, similar chemical complexity is expected for cobalt alloys. The role of new experimental, computational and data-centric design tools in discovering new alloys in this domain will be discussed. Ni additions to these new Co-base alloys are useful for tuning transformations, enabling these materials to be produced along cast, wrought and additive manufacturing paths. The unique properties of Co-Ni alloys will be discussed, along with future challenges for the exploration of the Co-Ni design space. |