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采用钛箔作为中间层扩散连接Ti3Al与Ti2AlNb,利用SEM,EDS和XRD等分析方法发现,接头界面组织结构为Ti3Al/α+β双相组织/富B2相/Ti2Al Nb.分别研究了中间层厚度,连接温度,保温时间等工艺参数对接头界面组织形貌以及力学性能的影响.结果表明,当钛箔厚度10μm,T=900℃,t=120 min,p=5 MPa时,接头组织性能最佳.钛箔厚度增加会导致Ti,Al,Nb等元素扩散不均匀;Ti3Al/Ti2Al Nb直接固相扩散连接温度为1 000℃,加入钛中间层可将其降低至900℃,减小了高温热循环对母材性能的损伤,接头整体抗拉强度从795 MPa提升至906MPa;保温时间90~120 min可保证扩散充分连接可靠.
Ti3Al and Ti2AlNb were diffused and connected by using Ti foil as intermediate layer. The microstructure of the interface was Ti3Al / α + β / B2 phase / Ti2Al Nb by means of SEM, EDS and XRD. The effects of interlayer thickness , Connection temperature, holding time and other process parameters on the interface morphology and mechanical properties of the joint.The results show that when the thickness of the titanium foil 10μm, T = 900 ℃, t = 120min, p = 5MPa, the joint performance The increase of the thickness of the titanium foil will lead to the non-uniform diffusion of Ti, Al, Nb and other elements. The direct solid-phase diffusion bonding temperature of Ti3Al / Ti2Al Nb is 1 000 ℃, the addition of titanium intermediate layer can reduce it to 900 ℃, Thermal cycle damage to the parent material properties, the overall tensile strength from 795 MPa to 906MPa; holding time 90 ~ 120 min to ensure adequate diffusion and reliable connection.