Stability Design and Oxidation Behaviour of Dual-Phase FeNiCrAlTi High-Entropy Alloys for High-Temperature Service
Authors:
- Zihan LiZLZihan Li
- Li Xin MeiLMLi Xin Mei
- Hui-Wen XiongHXHui-Wen Xiong
- Yong HeYHYong He
- Lei ZhangLZLei Zhang
Preprint
- 2 June 2026
- preprint
- Published by Elsevier in SSRN Electronic Journal
Abstract
To address the oxidation challenges of inert anodes in aluminum electrolysis, a series of novel Fe34.5Ni40.5Cr15Al10-xTix (x = 2, 3, 4) high-entropy alloys were designed by Thermo-Calc software and were fabricated via vacuum arc melting. A systematic investigation was conducted on the influence of the Al/Ti ratio on the high-temperature oxidation resistance of the alloys. A dual-phase microstructure comprising FCC and B2 phases is observed in the as-cast alloy. The alloy demonstrates exceptional oxidation resistance at 960 °C. Oxidation kinetics analysis reveals that its oxidation follows a parabolic rate law, controlled by diffusion. An adequate Al content favors the formation of a dense and stable Al2O3 layer, whereas an appropriate Ti addition alleviates the thermal expansion mismatch between the oxide scale and the substrate. Consequently, the Al7Ti3 composition achieves a very low parabolic rate constant of 0.0895 mg2·cm-4·h-1, which is 98.52% lower than other traditional anode materials like Cu-Ni-Cr alloys. This study delivers a theoretical basis for designing high-entropy alloys applied to inert anodes in aluminum electrolysis.Keywords
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