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<p>Laves phases composed of two-dimensional (2D) Laves tilings are prevalent in condensed matter systems, yet the existence of these 2D tilings as isolated structural motifs has remained unverified. Here, we report the discovery of a metastable, confined 2D Laves tiling precipitate in a compositionally dilute Mg alloy, revealed through aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) in combination with atomic-resolution energy-dispersive X-ray spectroscopy (EDS) mapping. The structure adopts a Laves-type Al<sub>2</sub>Ca configuration confined to the (0001) basal plane of the Mg matrix, with a thickness of merely a single tiling layer (~4.62 Å), stabilized by adjacent Mg/Ca interfacial atomic layers. Theoretical calculations reveal that tensile strain in the surrounding matrix suppresses the diffusion of small-sized Al solutes, thereby inhibiting out-of-plane coarsening. Notably, prolonged thermal exposure leads to the formation of multi-configurational layered Laves structures assembled from these fundamental units. These findings elucidate the precipitation behavior in Mg–Al–Ca alloys and uncover a structurally confined Laves tiling motif, advancing our understanding of Laves phase formation and solute clustering in metallic systems.</p>

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Discovery of confined two-dimensional Laves tiling in a magnesium alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月15日

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  • Hongbo Xie,
  • Xiande Ma,
  • Weixin Lou,
  • Benfu Wang,
  • Junpeng Li,
  • Enyu Guo,
  • Shanshan Li,
  • Yiping Lu

摘要

Laves phases composed of two-dimensional (2D) Laves tilings are prevalent in condensed matter systems, yet the existence of these 2D tilings as isolated structural motifs has remained unverified. Here, we report the discovery of a metastable, confined 2D Laves tiling precipitate in a compositionally dilute Mg alloy, revealed through aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) in combination with atomic-resolution energy-dispersive X-ray spectroscopy (EDS) mapping. The structure adopts a Laves-type Al2Ca configuration confined to the (0001) basal plane of the Mg matrix, with a thickness of merely a single tiling layer (~4.62 Å), stabilized by adjacent Mg/Ca interfacial atomic layers. Theoretical calculations reveal that tensile strain in the surrounding matrix suppresses the diffusion of small-sized Al solutes, thereby inhibiting out-of-plane coarsening. Notably, prolonged thermal exposure leads to the formation of multi-configurational layered Laves structures assembled from these fundamental units. These findings elucidate the precipitation behavior in Mg–Al–Ca alloys and uncover a structurally confined Laves tiling motif, advancing our understanding of Laves phase formation and solute clustering in metallic systems.