Elevated temperature microstructure evolution of a medium-entropy CrCoNi superalloy containing Al,Ti

Slone, C.E. and George, E.P. and Mills, M.J.

Volume: 817 Pages:
DOI: 10.1016/j.jallcom.2019.152777
Published: 2020

A new medium-entropy superalloy was produced based on the compositions of equiatomic CrCoNi and Ni-base superalloy Inconel 740H. Initial alloy design was performed using Thermo-Calc. The aging response and microstructural stability were assessed following heat treatment at temperatures between 600 and 900 °C and durations up to 100 h. Aging from a fully recrystallized state resulted in negligible grain growth and produced γ’ and σ phases. The same phases were present after aging from a cold-rolled state, but partially recrystallized microstructures resulted in multi-modal size distributions and heterogeneous spatial arrangements. Room temperature hardness measurements were used to correlate aging conditions with quantitative precipitate measurements and mechanical properties. © 2019 Elsevier B.V.

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