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  Effect of alloying elements on the coarsening rate of γʹ precipitates in multi-component CoNi-based superalloys with high Cr content

Zhuang, X., Antonov, S., Li, L., & Feng, Q. (2021). Effect of alloying elements on the coarsening rate of γʹ precipitates in multi-component CoNi-based superalloys with high Cr content. Scripta Materialia, 202: 114004. doi:10.1016/j.scriptamat.2021.114004.

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 Creators:
Zhuang, Xiaoli1, Author
Antonov, Stoichko2, Author              
Li, Longfei1, Author
Feng, Qiang1, Author
Affiliations:
1Beijing Advanced Innovation Center for Material Genome Engineering, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China, ou_persistent22              
2Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              

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Free keywords: Alloying; Alloying elements; Ostwald ripening; Superalloys, Coarsening behavior; Coarsening rates; Design and optimization; Elemental partitioning; Lattice misfits; Long-term aging; Multicomponents; Provide guidances, Coarsening
 Abstract: The γʹ coarsening behavior during long-term aging at 850°C of multi-component CoNi-based superalloys with high (14 at.) Cr content were investigated, and the effects of W, Mo or Ti (1 at.) additions were analyzed with respect to the change in the γ/γʹ microstructure, lattice misfit, and elemental partitioning behavior. The coarsening behavior of the γʹ precipitates follows the classical Lifshitz-Slyozov-Wagner (LSW) model, where the size is proportional to t1/3. The addition of either W, Mo or Ti (1 at.) alters the γ/γʹ elemental partitioning behavior and thus the γ/γʹ lattice misfit and interfacial energy, resulting in quite different coarsening rates of the γʹ precipitates, with Ti having the most significant effect. Cr was found to be the rate-limiting element of γʹ coarsening rather than the other alloying elements. This study could provide guidance for the design and optimization of CoNi-based superalloys with lower γ' coarsening rate. © 2021 Acta Materialia Inc.

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 Dates: 2021-09
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1016/j.scriptamat.2021.114004
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Title: Scripta Materialia
  Abbreviation : Scripta Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B. V.
Pages: - Volume / Issue: 202 Sequence Number: 114004 Start / End Page: - Identifier: ISSN: 1359-6462
CoNE: https://pure.mpg.de/cone/journals/resource/954926243506