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<p>The effects of transitional phase states on corrosion behavior in the equiatomic-derived high-entropy alloy Al₀.₃CoCrFeNi were investigated following 90% cold-rolling and subsequent isothermal annealing at 620 °C for durations ranging from 1 to 50 h. Electron and X-ray diffraction analysis reveal a progressive transformation from single-phase FCC to an FCC + B2 + σ trinity. Nano-scale B2 and σ nuclei emerge within partially recrystallized grains after 1–2 h, lowering the cold rolling micro-strain from 0.26 to 0.13. This heterogeneous state exhibits the maximum hardness (552 VHN) while enlarging the chloride-passive window by &gt; 200 mV relative to the solutionized material. Prolonged annealing ( &gt; 10 h) coarsens the intermetallics and exhausts Al from the matrix, thereby reducing pitting resistance due to the loss of protective Al₂O₃ film. Characterization by electron microscopy and atom probe tomography reveals that Al-rich B2 nuclei are the primary Al sink that compromises Al<sub>2</sub>O<sub>3</sub> formation at long times. The results demonstrate that a narrowly defined heat-treatment window balances strengthening with passivation in Al<sub>0.3</sub>CoCrFeNi, providing a mechanistic blueprint for designing corrosion-tolerant high-entropy alloys (HEAs).</p>

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Effects of annealing on phase transformation and corrosion mechanism of severely deformed Al0.3CoCrFeNi high-entropy alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月2日

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  • Fu-Yun Tsai,
  • Alice Pandaleon,
  • Sean O’Brien,
  • Andrew Martin,
  • Alana Pauls,
  • Farhan Ishrak,
  • Michael Lastovich,
  • Md Jasim Uddin,
  • Zengqing Zhuo,
  • Jinghua Guo,
  • Martin Mwangi Thuo,
  • Rajeev Gupta,
  • Rajarshi Banerjee,
  • Elizabeth Kautz,
  • Bharat Gwalani

摘要

The effects of transitional phase states on corrosion behavior in the equiatomic-derived high-entropy alloy Al₀.₃CoCrFeNi were investigated following 90% cold-rolling and subsequent isothermal annealing at 620 °C for durations ranging from 1 to 50 h. Electron and X-ray diffraction analysis reveal a progressive transformation from single-phase FCC to an FCC + B2 + σ trinity. Nano-scale B2 and σ nuclei emerge within partially recrystallized grains after 1–2 h, lowering the cold rolling micro-strain from 0.26 to 0.13. This heterogeneous state exhibits the maximum hardness (552 VHN) while enlarging the chloride-passive window by > 200 mV relative to the solutionized material. Prolonged annealing ( > 10 h) coarsens the intermetallics and exhausts Al from the matrix, thereby reducing pitting resistance due to the loss of protective Al₂O₃ film. Characterization by electron microscopy and atom probe tomography reveals that Al-rich B2 nuclei are the primary Al sink that compromises Al2O3 formation at long times. The results demonstrate that a narrowly defined heat-treatment window balances strengthening with passivation in Al0.3CoCrFeNi, providing a mechanistic blueprint for designing corrosion-tolerant high-entropy alloys (HEAs).