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Effect of chromium content on microstructural evolution of CoNiAlW superalloy

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Abstract

Effects of chromium (Cr) content on types and morphologies of various phases of a newly developed Co–Ni–Al–W superalloy (Co-30Ni-6W-9Al-3Ti-1Ta) have been investigated in this study. Microstructural examinations were carried out by field-emission scanning electron microscope (FESEM), electron backscatter diffraction (EBSD), high-resolution transmission electron microscope (HRTEM), and differential thermal analysis (DTA). Round-cornered cubic and cuboidal γ′ was developed in these new Co-based alloys after solutionizing at 1300 °C for 24 h and aging them at 900 °C for 96 h. Addition of 6 at.% Cr caused the formation of a new phase called µ with a stoichiometric formula Co7W6 within the γ matrix. Increasing the Cr content to 10 at.%, the volume fraction of μ phase increased from 0.5 to 3.7%. Further increase in Cr content to 14 at.% caused the formation of another phase, β, with a stoichiometric formula CoAl within the matrix. In addition, the presence of Cr significantly influenced the γ′ morphology and altered it from cuboidal to round corner cuboidal γ′. This was attributed to the reduction of γ/γ′ lattice misfit due to Cr addition. The formation of µ-Co7W6 phase has a pronounced effect on the solvus temperature. Both melting and γ′ solvus temperatures reduced due to the partitioning of elements such as W to μ phase by increasing Cr-content. A Kurdjumov–Sachs orientation relationship was also established between the γ/γ′ phases and β. Simulation of pole figures shows that diffusive transformations can have lattice distortive components, which is expected for martensitic transformations.

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Acknowledgements

The authors wish to thank the Niroo Research Institute for the provision of the research facilities used in this work.

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Authors and Affiliations

  1. School of Metallurgy and Material Engineering, Iran University of Science and Technology (IUST), Tehran, 16845-118, Iran

    Aliakbar Fallah Sheykhlari, Hossein Arabi & Seyed Mohammad Ali Boutorabi

  2. Laboratory of ThermoMechanical Metallurgy (LMTM), PX Group Chair, Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue de la Maladière 71b, 2000, Neuchâtel, Switzerland

    Cyril Cayron

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  1. Aliakbar Fallah Sheykhlari
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Correspondence to Hossein Arabi.

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Appendix: Nominal chemical composition and structure of γ, γ׳, µ, and β phases

Appendix: Nominal chemical composition and structure of γ, γ׳, µ, and β phases

Phase

Structure

Composition(s)

γ

FCC

Co, Ni and other elements in solid solution

γ′

L12 (ordered FCC)

Co3(Al,W)

µ

D85

Co7W6

β

B2

CoAl

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Fallah Sheykhlari, A., Arabi, H., Boutorabi, S.M.A. et al. Effect of chromium content on microstructural evolution of CoNiAlW superalloy. Appl. Phys. A 128, 719 (2022). https://doi.org/10.1007/s00339-022-05768-7

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