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<p>This study examined the mechanical properties of the complex-shaped curved surface structure with two stiffeners for TA7 titanium alloy, as well as the optimization of structural parameters, high precision superplastic forming (SPF), and these processes. To explore the impact of the structure, the corner, and the thickness on the mechanical property of the TA7 alloy structure, the tensile property was tested at room temperature and included in the finite element simulation. The outcomes demonstrated the flexibility of the construction with R = 1&#xa0;mm and T = 1.5&#xa0;mm. Then, to guarantee the accuracy of the geometrical measurements, the coefficient of thermal expansion of TA7 alloy was measured and the dimension of the dies was established. The curved surface structure with a complex shape was successfully fabricated by the high precision SPF process. Finally, the precision of the geometry, the distribution of thickness, the tensile property, and the observation of the microstructure were looked into. The configuration and the contour template were essentially in alignment, with a maximum gap between them of less than 0.2&#xa0;mm. At the stiffener, the thickness was at a minimum of 1.35&#xa0;mm. The grain size grew from 7.5&#xa0;mm to 14.8&#xa0;mm. The elongation was reduced by 0.4%, and the tensile strength dropped from 872 to 790&#xa0;MPa.</p>

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The Structural Parameters Optimization and the High Precision Superplastic Forming Process of the Complex-Shaped Curved Surface Structure for TA7 Titanium Alloy

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Zhihao Du,
  • Chunxu Wang,
  • Qing Liu,
  • Shan Wang,
  • Yang Liu,
  • Guofeng Wang

摘要

This study examined the mechanical properties of the complex-shaped curved surface structure with two stiffeners for TA7 titanium alloy, as well as the optimization of structural parameters, high precision superplastic forming (SPF), and these processes. To explore the impact of the structure, the corner, and the thickness on the mechanical property of the TA7 alloy structure, the tensile property was tested at room temperature and included in the finite element simulation. The outcomes demonstrated the flexibility of the construction with R = 1 mm and T = 1.5 mm. Then, to guarantee the accuracy of the geometrical measurements, the coefficient of thermal expansion of TA7 alloy was measured and the dimension of the dies was established. The curved surface structure with a complex shape was successfully fabricated by the high precision SPF process. Finally, the precision of the geometry, the distribution of thickness, the tensile property, and the observation of the microstructure were looked into. The configuration and the contour template were essentially in alignment, with a maximum gap between them of less than 0.2 mm. At the stiffener, the thickness was at a minimum of 1.35 mm. The grain size grew from 7.5 mm to 14.8 mm. The elongation was reduced by 0.4%, and the tensile strength dropped from 872 to 790 MPa.