【摘要】 采用激光诱导燃烧合成连接方法实现C_f/Al复合材料和TC4钛合金的可靠连接。放热中间层的燃烧合成反应为连接过程提供所需能量。结合理论计算和实验,对Ni-Al-Zr中间层的化学成分进行优化设计,并对连接接头的显微组织和力学性能进行研究。结果表明,Zr的加入轻微降低中间层的放热性,但显著提高连接质量,是实现可靠连接的关键。Ni-Al-Zr中间层与母材反应,在TC4钛合金侧生成TiAl₃反应层,在C_f/Al侧生成NiAl₃和Ni₂Al₃反应层。Zr含量决定接头的显微组织和剪切强度。当Zr含量为5 wt.%、连接压力为2 MPa时,接头最高剪切强度为19.8 MPa。更多还原

【Abstract】 The C_f/Al composites were joined to the TC4 alloy via the laser-induced combustion joining method. The exothermic reaction of the interlayer provided the required energy for the joining process. By combining the theoretical calculation and experiment, the chemical composition of the Ni-Al-Zr interlayer was designed. The microstructure and mechanical properties of the joint were investigated. The results show that the addition of Zr slightly weakened the combustion reaction of exothermic interlayer but played a key role in the successful joining. Ni-Al-Zr interlayer reacted with substrates, forming a TiAl₃ layer adjacent to TC4 alloy and NiAl₃, Ni₂Al₃ layers adjacent to the C_f/Al composites. Zr content dominated the microstructure and shear strength of the joint. When the Zr content was 5 wt.% under the joining pressure of 2 MPa, the joint had a maximum shear strength of 19.8 MPa.更多还原