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Meeting
2026 TMS Annual Meeting & Exhibition
Symposium
Environmental Degradation of Multiple Principal Component Materials
Presentation Title
Effects of Annealing on Phase Transformation and Corrosion Mechanism of Severely Deformed Al0.3CoCrFeNi High-Entropy Alloy
Author(s)
Fu-Yun Tsai, Alice Pandaleona, Sean O'Brien, Andrew Martin, Alana Pauls, Farhan Ishrak, Michael Lastovich, Md Jasim Uddin, Zengqing Zhuob, Jinghua Guo, Martin Thuo, Rajeev K. Gupta, Rajarshi Banerjee, Elizabeth Jane Kautz, Bharat Gwalani
On-Site Speaker (Planned)
Fu-Yun Tsai
Abstract Scope
The effects of transitional phase states on corrosion in Al0.3CoCrFeNi were investigated following 90% cold-rolling and annealing at 620 °C (1–50 h). XRD and electron diffraction reveal transformation from single-phase FCC to an FCC+B2+ó trinity. Nano-scale B2 and ó nuclei emerge within partially recrystallized grains after 1–2 h, reducing micro-strain and achieving peak hardness (552 VHN). This state enlarges the chloride-passive window by > 200 mV relative to solutionized material. Prolonged annealing (> 10 h) coarsens intermetallics and exhausts Al from the matrix, reducing pitting resistance due to loss of protective Al2O3. Microscopy and atom probe tomography reveal Al-rich B2 nuclei as the primary Al sink compromising Al2O3 formation. Results demonstrate that a narrow heat-treatment window balances strength and passivation, providing a blueprint for designing corrosion-tolerant high-entropy alloys (HEAs).
Proceedings Inclusion?
Planned:
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