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Phase Equilibria of the Fe-Si-Cr-Al Quaternary System at 800 °C

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Abstract

The isothermal sections of the Fe-Si-Cr-Al quaternary system at 800 °C with the Fe composition being fixed at 67 at.% and 50 at.% were determined experimentally using optical microscopy, scanning electron microscopy coupled with energy dispersive x-ray spectroscopy, and x-ray diffractometry. Two three-phase regions (BCC-A2 + σ + D03, FeSi + Fe5Si3 + D03) were found in the isothermal sections at 67 at.% Fe. Phase microstructures of Fe-corner in the quaternary Fe-Si-Cr-Al system were investigated, especially the multiphase regions containing bcc disordered phase and bcc ordered phases. D03 occupies almost half of the isothermal section and could maintain equilibrium with all phases (BCC-A2, σ, Fe5Si3, FeSi) in the isothermal section. One four-phase region (BCC-A2 + σ + Cr3Si + D03) and five three-phase regions (Cr3Si + D03 + BCC-A2, Cr3Si + σ + BCC-A2, Cr3Si + D03 + σ, Cr3Si + Fe5Si3 + D03, FeSi + Fe5Si3 + D03) were found in the isothermal section at 50 at.% Fe.

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Acknowledgements

Financial supports for this study was provided by the National Natural Science Foundation of China (Grant Nos. 51871030 and 51671036). We also thank for the financial support of Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, 213164, Jiangsu, People’s Republic of China

    Wenjie Chen, Haoyu Yang, Jingyu Yan, Ya Liu, Changjun Wu & Xuping Su

  2. Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, 213164, Jiangsu, People’s Republic of China

    Xuping Su

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  1. Wenjie Chen
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Chen, W., Yang, H., Yan, J. et al. Phase Equilibria of the Fe-Si-Cr-Al Quaternary System at 800 °C. J. Phase Equilib. Diffus. 42, 290–302 (2021). https://doi.org/10.1007/s11669-021-00881-1

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