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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:817

Article

Slone, C. E.^1,2  George, E. P.^3,4  Mills, M. J.^1,2 

[1] Ohio State Univ, Ctr Electron Microscopy & Anal, Columbus, OH 43212 USA

[2] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA

[3] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[4] Univ Tennessee, Mat Sci & Engn Dept, Knoxville, TN 37996 USA

关键词: Medium-entropy alloy;    CrCoNi;    Ni-base superalloy;    Microstructural stability;    Phase decomposition;   

DOI  :  10.1016/j.jallcom.2019.152777

来源: Elsevier

【 摘 要 】

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 degrees C and durations up to 100 h. Aging from a fully recrystallized state resulted in negligible grain growth and produced gamma' and sigma 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. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

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