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Experimental determination of (BCC + FCC) phase fields in the quaternary isotherm of Fe–Ni–Co–Cu at 950°C

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Abstract

Quaternary isotherm of Fe–Ni–Co–Cu at 950 °C is determined by multiphase diffusion couple experiments, focused on establishing the (BCC + FCC) two-phase regions. The present findings, combined with our previous study, discover the presence of five separate two-phase fields in this isotherm namely (BCC + Cu-rich FCC), (BCC + Cu-lean FCC richer in Fe), (BCC + Cu-lean FCC richer in Co), (Cu-rich FCC + Fe-rich FCC), and (Cu-rich FCC + Co-rich FCC). This also indicates the existence of two three-phase fields. Based on diffusion couples exhibiting planar interfaces between BCC and FCC phases, three tie lines in (BCC + Cu-rich FCC) two-phase field were also determined. It is observed that Fe–Co–Cu ternary isotherm at 950 °C has a wider BCC region (up to 8 wt% Cu) than the commonly accepted phase diagram. A qualitative representation of the entire quaternary isotherm is proposed in the form of multiple iso-Ni concentration sections.

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Acknowledgments

The financial support by Indian Space Research Organization through Space Technology Cell at IIT Kanpur is greatly acknowledged. The authors are thankful to Mr. Siva Kumar from Advanced Center for Materials Science, IIT Kanpur for facilitating the use of Electron Probe Micro-Analyzer.

Funding

Vikram Sarabhai Space Centre.

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  1. Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kalyanpur, U.P., 208016, India

    Biswarupa Samantaray & Kaustubh N. Kulkarni

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  1. Biswarupa Samantaray
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Correspondence to Kaustubh N. Kulkarni.

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Samantaray, B., Kulkarni, K.N. Experimental determination of (BCC + FCC) phase fields in the quaternary isotherm of Fe–Ni–Co–Cu at 950°C. Journal of Materials Research 38, 4081–4092 (2023). https://doi.org/10.1557/s43578-023-01124-4

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