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<p>In this work, we report the microstructure and mechanical properties of Al-8.7Zn-2.1Mg-0.15Zr alloy curved profile with irregular cross-section based on self-bending extrusion, the extrusion was performed at temperatures of 410&#xa0;°C, 440&#xa0;°C, 470&#xa0;°C, 500&#xa0;°C, 530&#xa0;°C, respectively. It is found the non-uniform flow of metal in the die could induce self-bending effect and, at the same time, led to microstructural heterogeneity on the profile cross-section. Moreover, low-temperature extrusion (&lt; 440&#xa0;°C) leads to surface cracking, while overburning at high temperatures (&gt; 500&#xa0;°C) degrades mechanical properties. As a result, a strength–ductility synergy is achieved for samples extruded at 470&#xa0;°C, in this way, the tensile strength for long-edge and short-edge of the L cross section profile after aging were examined as 458 MPa and ≥ 469 MPa, and the elongations were tested as 12.3% and 11%, respectively. The grain boundary misorientation, recrystallization fraction, and substructure during deformation was found responsible for the differences in mechanical properties. Further, multiscale characterization on microstructures reveals a coordinated strengthening mechanism between intragranular η′ phases (&lt; 6&#xa0;nm) and Al<sub>3</sub>Zr particles (~ 26&#xa0;nm). The obtained results provide theoretical support for self-bending extrusion of high-strength aluminum alloy curved profiles.</p> Graphical abstract <p></p>

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Microstructure and mechanical properties of Al–Zn–Mg–Zr alloy curved profile with asymmetrical cross-section based on self-bending extrusion

  • 期刊论文

  • 发表日期：

    2025年11月13日

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  • Yuanchun Huang,
  • Yuhui Wang,
  • Xianbin Gao,
  • Junhua Cheng,
  • Wenqing Zhu,
  • Wei Feng,
  • Shengchao Yang,
  • Xieyi Zhang,
  • Yu Liu

摘要

In this work, we report the microstructure and mechanical properties of Al-8.7Zn-2.1Mg-0.15Zr alloy curved profile with irregular cross-section based on self-bending extrusion, the extrusion was performed at temperatures of 410 °C, 440 °C, 470 °C, 500 °C, 530 °C, respectively. It is found the non-uniform flow of metal in the die could induce self-bending effect and, at the same time, led to microstructural heterogeneity on the profile cross-section. Moreover, low-temperature extrusion (< 440 °C) leads to surface cracking, while overburning at high temperatures (> 500 °C) degrades mechanical properties. As a result, a strength–ductility synergy is achieved for samples extruded at 470 °C, in this way, the tensile strength for long-edge and short-edge of the L cross section profile after aging were examined as 458 MPa and ≥ 469 MPa, and the elongations were tested as 12.3% and 11%, respectively. The grain boundary misorientation, recrystallization fraction, and substructure during deformation was found responsible for the differences in mechanical properties. Further, multiscale characterization on microstructures reveals a coordinated strengthening mechanism between intragranular η′ phases (< 6 nm) and Al3Zr particles (~ 26 nm). The obtained results provide theoretical support for self-bending extrusion of high-strength aluminum alloy curved profiles.

Graphical abstract