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采用MA-FAPAS工艺,借助中间层TiAl的燃烧反应放热,原位合成了梯度金属陶瓷(TiC)pNi和金属间化合物TiAl,并同步完成了(TiC)pNi/TiAl/Ti的扩散连接,研究了在外加温度场、电场和应力场耦合作用下连接结构的形成机制。利用FE-SEM、TEM和XRD等手段对各层及连接界面的微观结构和相组成,以及电场作用下各连接界面元素扩散特征进行分析;采用显微硬度压痕法对连接界面的韧性进行分析;采用剪切法、冷淬法和有限元法对界面结合强度和残余应力分布进行分析计算。结果表明,各燃烧层均发生充分反应并形成了良好的冶金结合,连接界面处存在强烈的元素交互扩散;连接界面具有较强的抗剥离和抗剪切强度,(TiC)PNi/TiAl界面为接头的薄弱环节。
The MA-FAPAS process was used to synthesize the gradient cermet (TiC) pNi and the intermetallic compound TiAl in situ with the exothermic combustion reaction of TiAl in the interlayer. The diffusion bonding of (TiC) pNi / TiAl / Ti was completed In the coupled application of temperature field, electric field and stress field, the formation mechanism of the connection structure. The microstructure and phase composition of each layer and interface were analyzed by FE-SEM, TEM and XRD. The diffusion characteristics of interface elements under the action of electric field were analyzed. The toughness of interface was analyzed by micro-hardness indentation method The shear bond strength, cooling quenching method and finite element method were used to analyze the interface bond strength and residual stress distribution. The results show that all the combustion layers react well and form a good metallurgical bond, and there is a strong interaction between elements in the interface. The interface has strong anti-stripping and anti-shear strength. The (TiC) PNi / TiAl interface is Weak link joints.