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

Abstract

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.

Authors:
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.
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE; INL Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1474099
Alternate Identifier(s):
OSTI ID: 1549129
Report Number(s):
INL/JOU-17-42212-Rev001
Journal ID: ISSN 0264-1275
Grant/Contract Number:  
AC07-05ID14517
Resource Type:
Accepted Manuscript
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 140; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Atom probe tomography; interfacial energy; nickel alloy; precipitate coarsening; superalloys

Citation Formats

Meher, S., Carroll, M. C., Pollock, T. M., and Carroll, L. J. Designing nickel base alloys for microstructural stability through low γ-γ' interfacial energy and lattice misfit. United States: N. p., 2017. Web. doi:10.1016/j.matdes.2017.11.065.
Meher, S., Carroll, M. C., Pollock, T. M., & Carroll, L. J. Designing nickel base alloys for microstructural stability through low γ-γ' interfacial energy and lattice misfit. United States. doi:10.1016/j.matdes.2017.11.065.
Meher, S., Carroll, M. C., Pollock, T. M., and Carroll, L. J. Fri . "Designing nickel base alloys for microstructural stability through low γ-γ' interfacial energy and lattice misfit". United States. doi:10.1016/j.matdes.2017.11.065. https://www.osti.gov/servlets/purl/1474099.
@article{osti_1474099,
title = {Designing nickel base alloys for microstructural stability through low γ-γ' interfacial energy and lattice misfit},
author = {Meher, S. and Carroll, M. C. and Pollock, T. M. and Carroll, L. J.},
abstractNote = {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.},
doi = {10.1016/j.matdes.2017.11.065},
journal = {Materials & Design},
number = ,
volume = 140,
place = {United States},
year = {2017},
month = {12}
}

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