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<p>The impacts of local chemical order (LCO) on the physical properties of high-entropy alloys (HEAs) have been widely discussed. However, the difficulty in unambiguously observing LCO with high precision poses a great challenge in establishing microscopic mechanisms regarding the impacts of LCO on physical properties. Furthermore, it is still unclear whether the LCO extends to HEA surfaces, which may impact surface-based properties, such as corrosion, oxidation, and catalytic activities. Through the utilization of scanning tunneling microscopy (STM), two surface LCO domains with corresponding <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\sqrt{5}\times \sqrt{5}R\pm 26.6^\circ\)</EquationSource> <EquationSource Format="MATHML"><math> <msqrt> <mrow> <mn>5</mn> </mrow> </msqrt> <mo>×</mo> <msqrt> <mrow> <mn>5</mn> </mrow> </msqrt> <mi>R</mi> <mo>±</mo> <mn>26</mn> <mo>.</mo> <msup> <mrow> <mn>6</mn> </mrow> <mrow> <mo>∘</mo> </mrow> </msup> </math></EquationSource> </InlineEquation> quasi-long-range orderings (QLRO) are directly observed on a CoCrFeMnNi surface. Density functional theory (DFT) calculations identify the LCO within QLRO supercells. The findings provide evidence of the existence of the&#xa0;surface LCO and demonstrate a method to directly observe the surface LCO of HEAs. With the ability to unambiguously resolve elemental configuration at atomic scale, the understanding of how LCO influences surface-based properties can be achieved, facilitating the design of HEAs with tailored functionalities.</p>

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Direct visualization of the existence of surface local chemical order in a high-entropy CoCrFeMnNi alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月28日

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  • Lauren Kim,
  • Prince Sharma,
  • Che-Wei Tsai,
  • E-Wen Huang,
  • Peter K. Liaw,
  • Jien-Wei Yeh,
  • Ganesh Balasubramanian,
  • TeYu Chien

摘要

The impacts of local chemical order (LCO) on the physical properties of high-entropy alloys (HEAs) have been widely discussed. However, the difficulty in unambiguously observing LCO with high precision poses a great challenge in establishing microscopic mechanisms regarding the impacts of LCO on physical properties. Furthermore, it is still unclear whether the LCO extends to HEA surfaces, which may impact surface-based properties, such as corrosion, oxidation, and catalytic activities. Through the utilization of scanning tunneling microscopy (STM), two surface LCO domains with corresponding \(\sqrt{5}\times \sqrt{5}R\pm 26.6^\circ\) 5 × 5 R ± 26 . 6 ∘ quasi-long-range orderings (QLRO) are directly observed on a CoCrFeMnNi surface. Density functional theory (DFT) calculations identify the LCO within QLRO supercells. The findings provide evidence of the existence of the surface LCO and demonstrate a method to directly observe the surface LCO of HEAs. With the ability to unambiguously resolve elemental configuration at atomic scale, the understanding of how LCO influences surface-based properties can be achieved, facilitating the design of HEAs with tailored functionalities.