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<p>The microstructure of Al-Cu-Gd-Mg-Mn-Zr-Sc alloy in the as-cast, rolled, and annealed conditions was examined; the influence of annealing on the microstructure was analyzed, alongside the mechanical characteristics and crystallographic texture of the alloy, and the fundamental mechanisms were explored. The microstructure of the as-cast alloy exhibits a primary aluminum solid solution, Al<sub>78-86</sub>Cu<sub>10-15</sub>Gd<sub>3-5</sub>Mn, Al<sub>80</sub>Gd<sub>5</sub>Cu<sub>8</sub>Si<sub>5</sub>, and confirms the presence of minor Mg<sub>2</sub>Si phases. Homogenization for 1 h resulted in the dissolution of the Mg<sub>2</sub>Si phase. The hardness of the as-cast alloy increased from 84 to 136&#xa0;HV after homogenization, quenching, and aging at 210&#xa0;°C for 6&#xa0;h. The hardness of the as-rolled alloy increased from 143 to 157&#xa0;HV after 3&#xa0;h of annealing at 150&#xa0;°C, due to aging effects outweighing recovery. The annealing of rolled specimens at 450&#xa0;°C or 550&#xa0;°C restores the maximum pole density of the (111) and (002) planes to their original orientations. In contrast, the positions of the (022) and (113) planes are not restored by this treatment. The as-rolled alloy after annealing at 150&#xa0;°C for 2&#xa0;h further enhances both strength (YS = 423 ± 1&#xa0;MPa, UTS = 456 ± 2&#xa0;MPa) and ductility (elongation = 5.3 ± 1.3%).</p>

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Strengthening Behavior, Microstructure, and Crystallographic Texture of the Al-Cu-Gd-Mg-Mn-Zr-Sc Alloy

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • S. M. Amer,
  • A. El-Khouly,
  • Dmitry Nikolayev,
  • T. A. Lychagina,
  • R. Yu. Barkov,
  • O. A. Yakovtseva,
  • M. V. Glavatskikh,
  • A. V. Pozdniakov

摘要

The microstructure of Al-Cu-Gd-Mg-Mn-Zr-Sc alloy in the as-cast, rolled, and annealed conditions was examined; the influence of annealing on the microstructure was analyzed, alongside the mechanical characteristics and crystallographic texture of the alloy, and the fundamental mechanisms were explored. The microstructure of the as-cast alloy exhibits a primary aluminum solid solution, Al78-86Cu10-15Gd3-5Mn, Al80Gd5Cu8Si5, and confirms the presence of minor Mg2Si phases. Homogenization for 1 h resulted in the dissolution of the Mg2Si phase. The hardness of the as-cast alloy increased from 84 to 136 HV after homogenization, quenching, and aging at 210 °C for 6 h. The hardness of the as-rolled alloy increased from 143 to 157 HV after 3 h of annealing at 150 °C, due to aging effects outweighing recovery. The annealing of rolled specimens at 450 °C or 550 °C restores the maximum pole density of the (111) and (002) planes to their original orientations. In contrast, the positions of the (022) and (113) planes are not restored by this treatment. The as-rolled alloy after annealing at 150 °C for 2 h further enhances both strength (YS = 423 ± 1 MPa, UTS = 456 ± 2 MPa) and ductility (elongation = 5.3 ± 1.3%).