搅拌摩擦焊工艺对钛基复合材料焊缝原位自生组织的影响

Effect of Friction Stir Welding Process on Microstructure of In-situ Titanium Matrix Composites

通过钛基复合材料的搅拌摩擦焊试验,研究了焊缝的宏观形貌和微观组织及成分。通过X射线衍射仪,金相显微镜和扫描电镜,分析了焊缝的物相组成,宏观形貌和显微结构,测试了焊缝的力学性能。结果表明,通过摩擦产生的热量,使得Ti与B_4C、C、LaB_6之间发生反应,进一步促进了钛基复合材料的焊缝中增强体的生成,增强体在焊缝内分布均匀,增强体在焊缝中的原位合成强化了焊缝的强度,避免了气孔、夹渣、裂纹等缺陷。

The macrostructure and microstructure of titanium matrix composite welding lines by friction stir welding were studied. The phase and macroscopic fracture of welding hnes were identified by XRD, and the microstructures was examined by scanning electron micrescopy. The results show that the Ti can react with B4C, C, and LaB6 in the welding lines by friction heat, which can improve reinforcement generating. The distribution of the reinforcement is homogeneous. With the help of the reinforcement, the welding lines of titanium matrix composite have a high strength and low defect, such as porosity, slag inclusion, and cracks.