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Title: Designing nickel base alloys for microstructural stability through low γ-γ' interfacial energy and lattice misfit

Journal Article · · Materials & Design
ORCiD logo [1];  [2];  [3];  [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States). Materials Science and Engineering Dept.
  2. Federal-Mogul Powertrain, Plymouth, MI (United States)
  3. 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
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (1)