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<p>This study investigates the effects of annealing treatment on the residual stress, microstructure, and mechanical properties of 7075 aluminum alloy. Experimental characterization and finite element simulations using ABAQUS/CAE were conducted to assess the alloy’s response to varying annealing temperatures. The results indicate that residual stress decreases exponentially with increasing annealing temperature. Specifically, as the annealing temperature increases from 350 to 500&#xa0;°C, the surface residual stress decreases from 12.7 to 3.0&#xa0;MPa experimentally and from 17.1 to 5.1&#xa0;MPa in simulations. Microstructural analysis reveals that annealing facilitates grain refinement, with the most homogeneous grain structure observed at 470&#xa0;°C. However, at this temperature, tensile strength and hardness decrease by 51.6% (from 464.8 to 225.3&#xa0;MPa) and 51.2% (from 163 to 79.8&#xa0;HV), respectively, compared to the as-quenched condition. X-ray diffraction (XRD) analysis further confirms that annealing not only alleviates residual stress but also induces phase transformations. Finite element simulations validate the model’s capability in capturing the thermo-mechanical behavior of the alloy during quenching, providing critical insights into stress evolution and the influence of cooling rate on residual stress development. These findings offer valuable guidance for optimizing annealing parameters to enhance the mechanical performance and service reliability of 7075 aluminum alloy in high-performance engineering applications.</p> Graphical Abstract <p></p>

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Optimization of Residual Stress Microstructure and Mechanical Properties in 7075 Aluminum Alloy Via Annealing

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Hanbing Chen,
  • Peng Tang,
  • Yueling Xie,
  • Yulong Ren,
  • Min Wang,
  • Lituan Mo

摘要

This study investigates the effects of annealing treatment on the residual stress, microstructure, and mechanical properties of 7075 aluminum alloy. Experimental characterization and finite element simulations using ABAQUS/CAE were conducted to assess the alloy’s response to varying annealing temperatures. The results indicate that residual stress decreases exponentially with increasing annealing temperature. Specifically, as the annealing temperature increases from 350 to 500 °C, the surface residual stress decreases from 12.7 to 3.0 MPa experimentally and from 17.1 to 5.1 MPa in simulations. Microstructural analysis reveals that annealing facilitates grain refinement, with the most homogeneous grain structure observed at 470 °C. However, at this temperature, tensile strength and hardness decrease by 51.6% (from 464.8 to 225.3 MPa) and 51.2% (from 163 to 79.8 HV), respectively, compared to the as-quenched condition. X-ray diffraction (XRD) analysis further confirms that annealing not only alleviates residual stress but also induces phase transformations. Finite element simulations validate the model’s capability in capturing the thermo-mechanical behavior of the alloy during quenching, providing critical insights into stress evolution and the influence of cooling rate on residual stress development. These findings offer valuable guidance for optimizing annealing parameters to enhance the mechanical performance and service reliability of 7075 aluminum alloy in high-performance engineering applications.

Graphical Abstract