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- Title
Stacking faults and their effects on improving plasticity in a Co–Al–W–base superalloy at 800 °C.
- Authors
Wang, Hongwei; Wang, Lei; Liu, Yang; Song, Xiu
- Abstract
The mechanisms of stacking fault (SF) nucleation and extension, as well as its effect on improving plasticity of Co-Al-W-base superalloys were investigated in the present study. The characteristics of SF during the plastic deformation were systematically characterized using Transmission Electron Microscopy and High-Resolution Transmission Electron Microscopy. The results show that the elongation of Co-Al-W-base superalloy can be significantly improved by around 5% with the multiplication and extension of SF at 800 ˚C in comparison to that at 700 ˚C. The superlattice intrinsic stacking fault (SISF) can nucleate within the γ′ phase, which originals from the dissociation of an a/2 < 110 > dislocation within the γ′ phase. The trailing partial dislocation is pinned in the γ′ phase, and the leading partial dislocation slip in the γ′ phase, forming the extended SISF. The extended SISF can continually extend by the leading partial dislocation, even though encountering the a/2 < 110 > dislocation at the γ/γ′ interface. Therefore, the SFs can provide stable and continual plastic flow for the superalloy during plastic deformation, which facilities to relax the stress concentration around the MC carbides, retarding the microcrack propagation. It is considered as the key point for improving the intermediate-temperature plasticity of Co-Al-W-base superalloys.
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 35, p16678
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-024-10085-w