Ti-Al体系含量对激光引燃自蔓延连接Cf/Al与TiAl接头显微组织和力学性能的影响

摘要

Cf/Al composites and TiAl alloys were joined by laser ignited self-propagating high-temperature synthesis (SHS) with Ni-Al-Ti interlayer. The effect of Ti-Al content on interfacial microstructure and mechanical properties of the joints was investigated. Localized melt of the substrates occurred in the joints.γ-Ni0.35Al0.30Ti0.35, NiAl3 and Ni2Al3 reaction layers formed adjacent to the substrates. Joint flaws, such as pores and cracks, made the joint density decrease and worked as the fracture source, which led to the sharp decline of joint strength. Additive Ti-Al increased joint density and strengthened the interlayer adhesion to Cf/Al. The joint flaws could be controlled by changing the Ti-Al content. When the Ti-Al content was 0.1, the joint was free of cracks with high density and reached the maximum shear strength of 24.12 MPa.%采用Ni-Al-Ti作中间层,通过激光引燃自蔓延方法对Cf/Al复合材料与TiAl合金进行连接,研究中间层中Ti-Al含量对接头界面显微组织和力学性能的影响.接头中发生了母材的局部融化,并在两侧母材处生成了γ-Ni0.35Al0.30Ti0.35、NiAl3和Ni2Al3反应层.接头缺陷(如气孔、裂纹)降低了接头的致密度,并作为断裂源使接头强度急剧下降.添加 Ti-Al 可以改善接头致密度,并增强中间层产物与 Cf/Al 复合材料的附着力.通过改变 Ti-Al含量,可以控制接头缺陷.当Ti-Al含量为0.1时,接头中无裂纹产生,致密度良好,强度达到最高值24.12 MPa.