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<p>This study explores the twining phenomenon in the Al<sub>2</sub>MgCu intermetallic compound, a common second phase in a hot-rolling high-alloyed Al-Zn-Mg-Cu alloy, using advanced electron backscatter diffraction (EBSD). Theoretically, the full twining elements of types I {110} &lt; –1, 1, 2.9197 &gt; twining system in Al<sub>2</sub>MgCu with an orthorhombic structure (space group cmcm) are first determined. There are two possible {1 1 0} twin variants, which are (1 1 0) [–1, 1, 2.9197] and (–1 1 0) [–1, –1, 2.9197], or crystallographically equivalent (–1 –1 0) [1, –1, –2.9197] and (1 –1 0) [1, 1, –2.9197]. The misorientation between a {1 1 0} twin and matrix Al<sub>2</sub>MgCu grains has been calculated to be [0 0 1] 44.3°, which can be used to identify {1 1 0} twins in Al<sub>2</sub>MgCu by EBSD.</p>

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Unveiling the Twinning Mechanisms in Al2MgCu: Insights from Electron Backscatter Diffraction Analysis in High Alloyed Al-Zn-Mg-Cu Alloys

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Shang Dai,
  • Luhai Liao,
  • Muhammad Abubaker Khan,
  • Jingyuan Li

摘要

This study explores the twining phenomenon in the Al2MgCu intermetallic compound, a common second phase in a hot-rolling high-alloyed Al-Zn-Mg-Cu alloy, using advanced electron backscatter diffraction (EBSD). Theoretically, the full twining elements of types I {110} < –1, 1, 2.9197 > twining system in Al2MgCu with an orthorhombic structure (space group cmcm) are first determined. There are two possible {1 1 0} twin variants, which are (1 1 0) [–1, 1, 2.9197] and (–1 1 0) [–1, –1, 2.9197], or crystallographically equivalent (–1 –1 0) [1, –1, –2.9197] and (1 –1 0) [1, 1, –2.9197]. The misorientation between a {1 1 0} twin and matrix Al2MgCu grains has been calculated to be [0 0 1] 44.3°, which can be used to identify {1 1 0} twins in Al2MgCu by EBSD.