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800oC-stable D022 superlattice in a NiCrFe-based medium entropy alloy
- Source :
- Materials Research Letters, Vol 12, Iss 3, Pp 172-179 (2024)
- Publication Year :
- 2024
- Publisher :
- Taylor & Francis Group, 2024.
-
Abstract
- The metastable-stable transition and rapid coarsening of metastable D022 phase remains its Achilles hell, restricting the application of D022-strengthened alloys at service temperatures higher than 650°C. Hence, it is crucial to improve thermal stability of D022 phase. In this work, we report an 800°C-stable D022-Ni3(W0.24Ti0.38Ta0.19Nb0.19) superlattice in the Ni58Cr23Fe10W5Ti2Ta1Nb1 MEA. Experimental results and theoretical analysis showed that the exceptional thermal stability is due to Nb-sublattice occupying elements, low diffusivity of W, and extremely small lattice misfit between the D022 phase and FCC matrix. These findings shed lights on developing high-performance D022-hardened alloys capable of operating at temperatures above 650°C.
Details
- Language :
- English
- ISSN :
- 21663831
- Volume :
- 12
- Issue :
- 3
- Database :
- Directory of Open Access Journals
- Journal :
- Materials Research Letters
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.7a1993b37f554fa89f37f25d633d3369
- Document Type :
- article
- Full Text :
- https://doi.org/10.1080/21663831.2024.2309271