Designing nickel base alloys for microstructural stability through low γ-γ' interfacial energy and lattice misfit
- Idaho National Lab. (INL), Idaho Falls, ID (United States). Materials Science and Engineering Dept.
- Federal-Mogul Powertrain, Plymouth, MI (United States)
- Univ. of California, Santa Barbara, CA (United States). Materials Dept.
In this paper, an extended stability alloy design strategy for multicomponent γ-γ' nickel-base alloys with near-zero lattice misfit and as low as possible interfacial energy was investigated by isothermal annealing of two experimental alloys at 900 °C for times up to 256 h. The coarsening behavior of the spherical γ' precipitates and the phase compositions determined by atom probe tomography were utilized to exploit a modified Lifshitz-Slyozov-Wagner relationship to estimate the interfacial energies. The estimated interfacial energies are much lower than predicted by a CALPHAD-based software as well as those typically reported for multicomponent γ-γ' nickel alloys. Finally, despite successfully minimizing the interfacial energy and γ-γ' lattice misfit, these factors alone were not sufficient to impart high temperature extended stability through reduced coarsening kinetics.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE; INL Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1474099
- Alternate ID(s):
- OSTI ID: 1549129
- Report Number(s):
- INL/JOU-17-42212-Rev001
- Journal Information:
- Materials & Design, Vol. 140; ISSN 0264-1275
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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