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采用高能喷丸(HESP)对TA17钛合金与0Cr18Ni9Ti不锈钢棒材端面表面进行自纳米化(SSNC)处理;采用镍箔作为中间层,在不同温度(800～875℃)下对处理后的钛合金/不锈钢进行脉冲加压扩散连接(PPDB)。对接头剖面组织进行金相观察;在拉伸试验机上测试接头拉伸强度,对断面进行SEM,EDS和XRD结构物相分析。研究结果表明:在850℃时接头拉伸强度达到最高,为322.8MPa;连接后接头界面处纳米晶粒没有完全长大,存在细晶粒区;镍箔有效地阻止了Fe-Ti脆性金属间化合物的形成,在接头处形成β-Ti,(Fe,Ni)固溶体和Ti-Ni金属间化合物(Ti2Ni,TiNi,TiNi3);断裂发生在Ni层与Ti-Ni金属间化合物界面处。
The surface of TA17 titanium alloy and 0Cr18Ni9Ti stainless steel bar were self-nanocrystallized (SSNC) by using high-energy shot peening (HESP). Nickel foil was used as the intermediate layer to treat the treated titanium alloy at different temperature (800 ~ 875 ℃) / Stainless steel pulse pressure diffusion bonding (PPDB). The microstructure of the joint was observed metallographically. Tensile strength of the joint was measured on a tensile testing machine, and SEM, EDS and XRD were used to analyze the structure. The results show that the tensile strength of the joint reached the highest at 322.8 MPa at 850 ℃. The nanocrystalline grains did not grow completely at the interface of the joint, and there was a fine grain region. The nickel foil effectively prevented the brittle intermetallic Fe- Β-Ti, (Fe, Ni) solid solution and Ti-Ni intermetallic compounds (Ti2Ni, TiNi, TiNi3) are formed at the joints; fracture occurs at the interface between the Ni layer and the Ti-Ni intermetallic compound.