采用ABAQUS有限元仿真软件模拟了TC4钛合金蜂窝芯的扩散连接/拉伸成形过程，基于仿真结果获得最优的拉伸长度，通过扩散连接/拉伸成形试验，研究了蜂窝芯的胞体轮廓、壁厚分布以及扩散连接界面形貌。结果表明：在920℃/3 MPa/60 min参数下扩散连接得到层叠板，并在温度800℃、拉伸速度1 mm·s^-1下拉伸75 mm后得到蜂窝芯，该蜂窝芯中形成了规则的正六边形胞体，验证了扩散连接/拉伸成形工艺制备蜂窝芯的可行性；蜂窝芯中部胞体质量较好，尺寸精度较高，其平均高度为16.2 mm，平均宽度为21.5 mm，弯曲圆角为2.5 mm，最大减薄率为5.37%；层叠板扩散连接区域未出现明显孔洞缺陷，焊合率超过95%，经过拉伸后扩散连接区域未出现撕裂，弯曲圆角区域未出现裂纹。

The diffusion bonding/stretching forming process of TC4 titanium alloy honeycomb core was simulated by ABAQUS finite element simulation software, and the optimal stretching length was obtained by the simulation. The cell outline, wall thickness distribution and diffusion bonding interface morphology of honeycomb core were studied by diffusion bonding/stretching forming tests. The results show that after TC4 titanium alloy laminate was obtained by diffusion bonding at 920 ℃/3 MPa/60 min and then stretched for 75 mm at 800 ℃ and strain rate of 1 mm·s^-1 to form honeycomb core. The regular hexagonal cells were formed in the honeycomb core, which verified the feasibility of preparing honeycomb core by diffusion bonding/stretching forming process. The cells of honeycomb core middle part had good quality and relatively high dimension accuracy, with the average height of 16.2 mm, average width of 21.5 mm, bending round corner of 2.5 mm, and the maximum thinning rate of 5.37%. There was no obvious hole defect in the welding area of laminate, and the welding rate exceeded 95%; after stretching there was no tear in the diffusion bonding area, and no cracks in the bending round corner area.