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分别对Ti Al合金与TC4钛合金、置氢0.5 wt%的TC4钛合金进行了扩散焊接试验。利用扫描电子显微镜、X射线衍射分析仪、能谱分析仪对接头界面进行了分析,并开展了抗剪强度试验。结果表明,在焊接温度为850℃,连接压力为15 MPa的工艺参数下,当保温时间为5 min时,连接界面存在细小孔洞;当保温时间为15 min时,置氢TC4钛合金的界面孔洞消失,并且产生一定厚度的反应层:保温时间达到30 min时,置氢TC4钛合金与Ti Al合金接头的连接强度平均可达290 MPa。断口分析表明,界面组织主要由Ti Al、Ti_3Al、Ti Al_2和Ti_3Al_5相组成。在相同的扩散焊接工艺规范下,置氢TC4钛合金与Ti Al合金的扩散接头连接强度明显高于未置氢TC4钛合金与Ti Al合金的扩散接头连接强度。
Diffusion welding tests were carried out on TiAl alloy and TC4 titanium alloy respectively with 0.5 wt% TC4 titanium alloy. The interface of the joint was analyzed by scanning electron microscope, X-ray diffraction analyzer and energy spectrum analyzer, and the shear strength test was carried out. The results show that when the holding time is 5 min, there are tiny holes in the interface when the welding temperature is 850 ℃ and the connection pressure is 15 MPa. When the holding time is 15 min, the interface holes Disappeared and produced a certain thickness of the reaction layer. When the holding time reached 30 min, the connection strength between the hydrogen-receiving TC4 titanium alloy and the TiAl alloy joint averaged 290 MPa. Fracture analysis shows that the interfacial microstructure consists of TiAl, Ti_3Al, TiAl_2 and Ti_3Al_5 phases. Under the same diffusion welding process, the connection strength between the diffusion joint of TC4 titanium alloy and Ti Al alloy was significantly higher than that of TC4 titanium alloy and TiAl alloy.