Effect of Ti-Al content on microstructure and mechanical properties of C_f/Al and TiAl joint by laser ignited self-propagating high-temperature synthesis  

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

作　　者：冯广杰[1] 李卓然[1] 冯士诚 申忠科[1] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第5期1468-1477,共10页中国有色金属学报（英文版）

基　　金：Project(51075101)supported by the National Natural Science Foundation of China

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, NiA l3 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、NiA l3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.

关 键 词：Cf/Al composite TiAl alloys JOINT self-propagating high-temperature synthesis INTERLAYER Ti-Al content 

分 类 号：TG457[金属学及工艺—焊接]