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Nitrogen-Induced Phase Separation in Equiatomic FeNiCo Medium Entropy Alloy

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Sasidhar,  Kasturi Narasimha
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Meka,  S. R.
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee 247667, India;
Emeriti and Others, Max Planck Institute for Intelligent Systems, Max Planck Society;
Dept. Phase Transformations; Thermodynamics and Kinetics, Max Planck Institute for Intelligent Systems, Max Planck Society;
Stress and Defects Driven Phase Transformation, Max Planck Partner Group, Interdepartmental and Partner Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Qadri, S. A. R., Sasidhar, K. N., Jägle, E. A., Miyamoto, G., Miyamoto, G., Meka, S. R., et al. (2022). Nitrogen-Induced Phase Separation in Equiatomic FeNiCo Medium Entropy Alloy. Metallurgical and Materials Transactions A, 53(9), 3216-3223. doi:10.1007/s11661-022-06746-7.


Cite as: https://hdl.handle.net/21.11116/0000-000F-AF2C-C
Abstract
We report the first observation of isothermal phase separation triggered by inwardly diffusing interstitial nitrogen atoms during nitriding of an equiatomic FeNiCo medium entropy alloy. Detailed microstructural characterization revealed a phase-separated microstructure within the nitrided region containing two FCC solid solution phases with one enriched in Fe and N while other enriched in Co and Ni. This demonstrates the potential utilization of interstitial N alloying to tailor the microstructure of multi-principal element alloys.