For the purpose of high-temperature service potential and the weight reduction expectation in aviation engineering applications, dissimilar joining of TiAl alloy to Ni-based superalloy has been conducted with a newly designed Fe-based filler metal. The microstructure and chemical composition at the interfaces were investigated by SEM, EPMA, and XRD. The filler metal consisted of Fe-based solid solution and a small amount of precipitated (Fe, Cr)ss. The wettability experiment results showed that the filler metal presented a stronger reaction tendency and more sufficient spreading behavior on Ni-based superalloy than on TiAl alloy. The brazed joint was composed of TiAl diffusion affected zone, Ni₃Al, TiCo, borides, (Ni, Fe, Co, Cr)ss, and γ-TiAl dissolved with Ni. A stronger reaction tendency occurred between Ni and TiAl substrate due to the lower dissolution enthalpies of element Ni in melts of Ti and Al. The joints brazed at 1180 °C/5 min presented a shear strength of 267 MPa at room temperature.

为了在航空工程应用中具有高温使用潜力和减轻重量的期望，已经使用新设计的铁基填充金属进行了TiAl合金与镍基高温合金的异种连接。通过SEM，EPMA和XRD研究了界面处的微观结构和化学成分。填充金属由铁基固溶体和少量沉淀的（Fe，Cr）ss组成。润湿性实验结果表明，与TiAl合金相比，Ni基高温合金具有更高的反应趋势和更充分的铺展行为。钎焊接头由TiAl扩散影响区Ni _3组成Al，TiCo，硼化物，（Ni，Fe，Co，Cr）ss和溶解有Ni的γ-TiAl。由于元素Ni在Ti和Al熔体中的溶解焓较低，因此Ni和TiAl基体之间发生了较强的反应趋势。在1180°C / 5 min时钎焊的接头在室温下的剪切强度为267 MPa。