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<p>In this study, the microstructure and mechanical properties of 7136 aluminum alloy thick plates (with a final thickness of 80&#xa0;mm) at different position in homogenized, hot-rolled, and aged conditions were studied. The results demonstrate that the volume fraction of the second phase in homogenized ingots and hot-rolled thick plate exhibits the highest value at position 1/4 H, followed by surface, and the lowest value at position 1/2 H. Hot-rolled thick plate was more prone to dynamic recrystallization near the surface, and the volume fraction of recrystallization gradually decreases along the surface toward the center, resulting in uneven texture and mechanical properties. The maximum difference in tensile strength among the alloy samples taken at the different thickness positions in the TD and RD directions was 14.2%. Via aging, the alloy uniformly precipitates a large number of nano-scale η′ precipitates in different thicknesses position, and the size and volume fraction of the η′ phase exhibit negligible variations. Consequently, the mechanical properties demonstrate minimal variation, with a maximum tensile strength of 618.9&#xa0;MPa and differences across various orientations and thicknesses position remaining below 6%.</p>

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Microstructure and Mechanical Properties of 7136 Al Thick Plates at Different Locations in Homogenized, Hot-Rolled, and Aged Conditions

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • Jiale Man,
  • Yizhe Wu,
  • Fengchun Wang,
  • Lei Wang,
  • Baoxia Ma,
  • Yicheng Feng

摘要

In this study, the microstructure and mechanical properties of 7136 aluminum alloy thick plates (with a final thickness of 80 mm) at different position in homogenized, hot-rolled, and aged conditions were studied. The results demonstrate that the volume fraction of the second phase in homogenized ingots and hot-rolled thick plate exhibits the highest value at position 1/4 H, followed by surface, and the lowest value at position 1/2 H. Hot-rolled thick plate was more prone to dynamic recrystallization near the surface, and the volume fraction of recrystallization gradually decreases along the surface toward the center, resulting in uneven texture and mechanical properties. The maximum difference in tensile strength among the alloy samples taken at the different thickness positions in the TD and RD directions was 14.2%. Via aging, the alloy uniformly precipitates a large number of nano-scale η′ precipitates in different thicknesses position, and the size and volume fraction of the η′ phase exhibit negligible variations. Consequently, the mechanical properties demonstrate minimal variation, with a maximum tensile strength of 618.9 MPa and differences across various orientations and thicknesses position remaining below 6%.