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<p>The manipulation of intermetallic phases, particularly quasicrystalline approximants, offers a promising pathway to enhance the mechanical performance of aluminum alloys. This study characterizes the crystallographic orientation relationship (OR) and nucleation behavior of the Al<sub>4</sub>Mn approximant phase in a suction-cast Al–8Mn–2Ni (wt.%) alloy. Combined SEM, EBSD, and TEM analyses reveal a distinct orientation relationship (OR), demonstrating that the Al<sub>4</sub>Mn phase promotes twin formation in the α-Al matrix. Crucially, calculations based on the edge-to-edge matching (E2EM) model reveal a specific low mismatch planar relationship of {020}<sub><i>α</i>-Al</sub> // {55—100}<sub>Al4Mn</sub> with an inter-planar spacing mismatch of only 1.33%. This exceptionally low mismatch value quantitatively validates the high potency of the Al<sub>4</sub>Mn phase as a heterogeneous nucleation substrate for <i>α</i>-Al grains. These findings provide a theoretical basis for utilizing Al<sub>4</sub>Mn approximants as effective grain refiners, suggesting a novel microstructural design strategy for developing high-strength lightweight Al–Mn–Ni alloys with optimized ductility.</p>

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Orientation relationship between Al4Mn approximate quasicrystals and α-Al phases in suction casting Al-8wt.% Mn-2wt.% Ni alloy

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Zhongwei Chen,
  • Guoyang Jia,
  • Bo An,
  • Zhaokang Sun,
  • Zejin Wang,
  • Yi Zeng,
  • Huming Niu,
  • Wanming Jiang

摘要

The manipulation of intermetallic phases, particularly quasicrystalline approximants, offers a promising pathway to enhance the mechanical performance of aluminum alloys. This study characterizes the crystallographic orientation relationship (OR) and nucleation behavior of the Al4Mn approximant phase in a suction-cast Al–8Mn–2Ni (wt.%) alloy. Combined SEM, EBSD, and TEM analyses reveal a distinct orientation relationship (OR), demonstrating that the Al4Mn phase promotes twin formation in the α-Al matrix. Crucially, calculations based on the edge-to-edge matching (E2EM) model reveal a specific low mismatch planar relationship of {020}α-Al // {55—100}Al4Mn with an inter-planar spacing mismatch of only 1.33%. This exceptionally low mismatch value quantitatively validates the high potency of the Al4Mn phase as a heterogeneous nucleation substrate for α-Al grains. These findings provide a theoretical basis for utilizing Al4Mn approximants as effective grain refiners, suggesting a novel microstructural design strategy for developing high-strength lightweight Al–Mn–Ni alloys with optimized ductility.