The superplastic forming/diffusion bonding (SPF/DB) process has been proved to be an effective way to fabricate multi-layer integrated structures. During this study, a hollow structure with two stiffeners was manufactured by SPF/DB process using TA7 titanium alloy. The tensile behavior of the alloy was investigated by undertaking uni-axial tensile tests at high temperature, with results showing that the maximum elongation was 199.8% at 870 °C/0.001 s⁻¹. Diffusion bonding experiments utilizing TA7 titanium alloy were conducted at different temperatures. The shear strength of DB joints at 880 °C and 900 °C were 568.4 MPa and 569.1 MPa, respectively. Based on the superplastic properties, a finite element simulation of the hollow structure was carried out, with results showing that this could be fabricated by the DB/SPF process. Finally, fabrication of this hollow structure was successfully demonstrated by DB at 880 °C/2 MPa/1 h and SPF at 870 °C with a target strain rate of 0.001 s⁻¹. Thickness measurements indicated that the maximum reduction in thickness was approximately 10% and occurred at the short stiffener. The experimental result was less than the predicted reduction from the finite element simulation. When comparing the tensile strength and elongation of the initial material, the reduction in the manufactured material was 9.4% and 0.4%, respectively. The microstructure was characterized and the average grain size was measured to increase from 7.5 μm to 14.8 μm.

超塑性成形/扩散结合（SPF/DB）工艺已被证明是制造多层集成结构的有效方法。在这项研究中，使用 TA7 钛合金通过 SPF/DB 工艺制造了具有两个加强筋的中空结构。通过在高温下进行单轴拉伸试验研究了合金的拉伸行为，结果表明在 870 °C/0.001 s ^{-1 时}的最大伸长率为 199.8%. 利用 TA7 钛合金在不同温度下进行了扩散结合实验。DB接头在880°C和900°C下的剪切强度分别为568.4 MPa和569.1 MPa。基于超塑性特性，对空心结构进行了有限元模拟，结果表明这可以通过 DB/SPF 工艺制造。最后，DB 在 880 °C/2 MPa/1 h 和 SPF 在 870 °C 下成功地证明了这种中空结构的制造，目标应变速率为 0.001 s ^-1. 厚度测量表明，厚度的最大减少约为 10%，发生在短加强筋处。实验结果小于从有限元模拟预测的减少。当比较初始材料的拉伸强度和伸长率时，制造材料的减少量分别为 9.4% 和 0.4%。对微观结构进行表征，并测量平均晶粒尺寸从 7.5 μm 增加到 14.8 μm。