Designing nickel base alloys for microstructural stability through low γ-γ′ interfacial energy and lattice misfit
| Autor: | S. Meher, Tresa M. Pollock, M. C. Carroll, L.J. Carroll |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Alloy Kinetics Thermodynamics chemistry.chemical_element 02 engineering and technology Atom probe engineering.material 01 natural sciences law.invention law Lattice (order) 0103 physical sciences lcsh:TA401-492 General Materials Science CALPHAD 010302 applied physics Mechanical Engineering 021001 nanoscience & nanotechnology Surface energy Superalloy Nickel chemistry Mechanics of Materials engineering lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
| Zdroj: | Materials & Design, Vol 140, Iss, Pp 249-256 (2018) |
| ISSN: | 0264-1275 |
| Popis: | 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. 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. Keywords: Atom probe tomography, γ-γ′ nickel-base alloy, Interfacial energy, Precipitate coarsening |
| Databáze: | OpenAIRE |
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