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Distribution of Alloying Element Atoms between γ- and γ'-Phase Particles in a Heat-Resistant Nickel Alloy

  • STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
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Abstract

Results of the study of the chemical composition of contacting γ- and γ'-phase particles in a granular heat-resistant nickel alloy (HNA) VV751P (Ni–15Co–12Cr–0.7V–0.3C–0.9W–2.7Mo–3.4Ti–2.0Nb–8.3Al–0.02Hf–0.008B, at %) by atom probe tomography are analyzed. Experimental and literature data on the preferential location of alloying elements in γ- and γ'-phase particles in different heat-resistant nickel alloys are considered. A criterion for the characterization of each of elements based on the ratio K = Еv/r2 (where Еv is the number of valence electrons and r is the atomic radius of an element) is suggested. It is shown that the higher the K value, the more probable the enrichment of γ-phase particles in this element and the higher the degree of such an enriching. The lower the K value, the more probable the enrichment of γ'‑phase particles in this element and the higher the degree of such an enriching. The effect of γ- and γ'-forming elements in heat-resistant nickel alloys and other factors on the stability of the γ- and γ' phases, mechanical characteristics of disc heat-resistant nickel alloys at room temperature, and long-term strength at operating temperatures is discussed.

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ACKNOWLEDGMENTS

We thank A.M. Kazberovich for his assistance in preparing the manuscript and useful discussion of the results.

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Authors and Affiliations

  1. JSC All-Russia Institute of Light Alloys, 121596, Moscow, Russia

    L. B. Ber

  2. Alikhanov Institute of Theoretical and Experimental Physics, National Research Center Kurchatov Institute, 117218, Moscow, Russia

    S. V. Rogozhkin, A. A. Khomich & A. G. Zaluzhnyi

  3. National Research Nuclear University MIFI, 115409, Moscow, Russia

    S. V. Rogozhkin & A. G. Zaluzhnyi

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  1. L. B. Ber
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  2. S. V. Rogozhkin
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  3. A. A. Khomich
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  4. A. G. Zaluzhnyi
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Correspondence to S. V. Rogozhkin.

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Translated by N. Kolchugina

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Ber, L.B., Rogozhkin, S.V., Khomich, A.A. et al. Distribution of Alloying Element Atoms between γ- and γ'-Phase Particles in a Heat-Resistant Nickel Alloy. Phys. Metals Metallogr. 123, 163–177 (2022). https://doi.org/10.1134/S0031918X22020028

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  • DOI: https://doi.org/10.1134/S0031918X22020028

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