800oC-stable D022 superlattice in a NiCrFe-based medium entropy alloy

Mei Lin; Jianlin Lu; Yiming Chen; Zhongsheng Yang; Xin Liu; Kaiwei Zhang; Zhijun Wang; Junjie Li; Jincheng Wang; Feng He

doi:10.1080/21663831.2024.2309271

Materials Research Letters (Mar 2024)

800oC-stable D022 superlattice in a NiCrFe-based medium entropy alloy

Mei Lin,
Jianlin Lu,
Yiming Chen,
Zhongsheng Yang,
Xin Liu,
Kaiwei Zhang,
Zhijun Wang,
Junjie Li,
Jincheng Wang,
Feng He

Affiliations

Mei Lin: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China
Jianlin Lu: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China
Yiming Chen: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China
Zhongsheng Yang: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China
Xin Liu: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China
Kaiwei Zhang: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China
Zhijun Wang: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China
Junjie Li: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China
Jincheng Wang: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China
Feng He: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China

DOI: https://doi.org/10.1080/21663831.2024.2309271
Journal volume & issue: Vol. 12, no. 3
pp. 172 – 179

Abstract

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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.

Published in Materials Research Letters

ISSN: 2166-3831 (Online)
Publisher: Taylor & Francis Group
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.tandfonline.com/journals/tmrl

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