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<p>Atomic ordering in single-crystal <i>β</i>–Cu–Zn–Al, relevant to the martensitic transformation and functional properties, is investigated using analytical STEM. Atomic-resolution EDS along the [110] zone axis, where all Wyckoff positions are spatially resolved, reveals three chemically distinct site occupancies. Correlation with HAADF-STEM contrast provides real-space evidence consistent with L2<sub>1</sub> ordering. In agreement with experiments, first-principles calculations show a slight energetic preference for L2<sub>1</sub> over D0<sub>3</sub>, with finite-temperature free-energy calculations indicating that this preference persists at elevated temperatures.</p>

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Atomic-Resolution EDS Characterization of Ordering in a β–Cu–Zn–Al Alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月7日

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  • Aleksander A. Larsen,
  • Sandeep Gorantla,
  • Phuong D. Nguyen,
  • Andreas Rosnes,
  • Yijiang Xu,
  • Konstantina Iordanidou,
  • Patricia A. Carvalho,
  • Xian Chen,
  • Anette E. Gunnæs,
  • Ole M. Løvvik

摘要

Atomic ordering in single-crystal β–Cu–Zn–Al, relevant to the martensitic transformation and functional properties, is investigated using analytical STEM. Atomic-resolution EDS along the [110] zone axis, where all Wyckoff positions are spatially resolved, reveals three chemically distinct site occupancies. Correlation with HAADF-STEM contrast provides real-space evidence consistent with L21 ordering. In agreement with experiments, first-principles calculations show a slight energetic preference for L21 over D03, with finite-temperature free-energy calculations indicating that this preference persists at elevated temperatures.