Abstract
The phase equilibria and diffusivity of Co–Fe–Mn system were investigated using alloy equilibrium and the diffusion couple technique. Furthermore, thermodynamic properties and diffusion mobilities were assessed using the CALPHAD approach. Isothermal sections of the ternary phase diagrams of the Co–Fe–Mn alloy at 800, 900, and 1000 °C were obtained. The phase boundaries between face-centered cubic (fcc)/A13 were experimentally determined for the first time, whereas those between fcc/body-centered cubic were similar to those reported in previous studies. The thermodynamic parameters of the A13 phase were assessed based on these results. The phase diagrams obtained using the thermodynamic interaction parameters in this study are in accordance with the experimental results. The diffusion paths of the fcc Co–Fe–Mn ternary systems at 900, 1000, and 1100 °C were experimentally determined, and the interdiffusivities were evaluated from the composition-penetration profiles using the Whittle–Green method. The interdiffusion coefficients and penetration profiles were calculated using the assessed atomic mobility parameters. The calculated interdiffusion coefficients and penetration profiles agreed with the experimental ones, validating the values of the optimized atomic mobility parameters.
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Acknowledgements
This study was supported by a Grant-in-Aid for Scientific Research on Innovative Areas “High Entropy Alloys—Science of New Class of Materials Based on Elemental Multiplicity and Heterogeneity” (JSPS KAKENHI Grant Number 18H05454) and a Grant-in-Aid for Scientific Research (B) “Interfacial control of Co-based superalloy for new forging process” (JSPS KAKENHI Grant Number 18H01742). We would like to thank Editage (www.editage.com) for English language editing.
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SPP contributed to methodology, investigation, software, validation, visualization, formal analysis, and writing—original draft. NU contributed to formal analysis, resources, and writing—review and editing. KO contributed to conceptualization, funding acquisition, methodology, resources, writing—review and editing, and supervision. YT contributed to formal analysis and writing—review and editing. TK contributed to formal analysis, funding acquisition, resources, and writing—review and editing.
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Pendem, S.P., Ueshima, N., Oikawa, K. et al. Thermodynamic and atomic mobility assessment of the Co–Fe–Mn system. J Mater Sci 57, 15999–16015 (2022). https://doi.org/10.1007/s10853-022-07612-y
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DOI: https://doi.org/10.1007/s10853-022-07612-y