We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Stress driving element redistribution and rafting of γ′ phase in Ni–Al–Mo superalloy.
- Authors
Ju, Yinfei; Wang, Huiyu; Sang, Peng; Zhang, Zan; Li, Kaiyue; Long, Hongli; Li, Yongsheng
- Abstract
Servicing as the blade of aircraft engine, Ni-based superalloys suffer the axis stress in working. Driven by the creep strain energy, the γ′-Ni3Al precipitates will be rafted via the element diffusion in Ni-based superalloys, and the rafting of γ′ phase has great effects on the creep properties of the superalloys. By coupling the sublattice free energy and crystal plasticity model, the phase-field modeling is performed to investigate the evolution kinetics of γ′-Ni3Al phase in the Ni–15Al–2Mo (at.%) superalloy under creep stress, and the elements directional diffusions between the γ/γ′ phases are revealed. The increase of Al concentration and the decrease of Mo concentration in the γ channel both promote the directional connection of γ′ phase. An initial stage increase in partition coefficient of K Mo γ ′ / γ indicates that the fast rafting rate of γ′ phase repulses the Mo to the connection area of γ′ phases. The effects of diffusion potential including elastic potential and chemical potential on the diffusion and rafting of γ′ phase are clarified. The elements directional diffusion between γ/γ′ phases is driven by the difference of chemical potential and elastic potential between γ phase and γ′ phase, and the elastic contribution to the diffusion of Mo is larger than that of Al and plays a leading role in the rafting of γ′ phase.
- Subjects
HEAT resistant alloys; STRAINS &; stresses (Mechanics); CHEMICAL potential; STRAIN energy; NICKEL alloys
- Publication
Journal of Materials Science, 2023, Vol 58, Issue 20, p8535
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-023-08529-w