温度对C_f/Al与TiAl自蔓延连接接头界面及性能的影响  

Influence of temperature on microstructure and propertiesof C_f/Al and TiAl SHS joint

作　　者：李卓然[1] 冯广杰[1] 徐慨[1] 张相龙[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：《焊接学报》2013年第9期5-8,113,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51075101)

摘　　要：采用自蔓延连接方法,在真空炉中利用中间层14Al-2Ni-3CuO实现了C f/Al复合材料与TiAl合金的连接.在连接接头中,靠近TiAl侧,中间层与TiAl生成TiAl3;靠近C f/Al侧,中间层与C f/Al生成NiAl3;在C f/Al复合材料中,中间层的Ni原子扩散到复合材料中,在C f/Al也有NiAl3生成.连接温度对接头界面组织及接头强度影响较大,随着连接温度的升高,中间层与TiAl生成的TiAl3层厚度明显增加.接头抗剪强度先逐渐增大,在550℃时最高可达26.9 MPa,当连接温度达到600℃时,接头的抗剪强度迅速降低.连接温度较低时,断裂多发生在靠近中间层的TiAl侧;连接温度较高时,断裂多发生在靠近中间层的C f/Al复合材料侧.Cf/ Al composite was joined to TiAl alloy by SHS process in a vacuum furnace with 14Al-2Ni-3CuO interlayer. On TiAl side,TiAl3layer formed in the interface; on Cf/ Al side,NiAl3generated in the interface. Within Cf/ Al,NiAl3was also produced due to the diffusion of Ni from the interlayer. The joining temperature greatly affected the microstructure and mechanical properties of the resultant joints. With the increasing of joining temperature,the TiAl3layer in the interface became thicker and the mechanical properties of the joints increased obviously,and the shear strength of joints reached 26. 9MPa at 550 ℃.However,when the joining temperature exceeded 600 ℃,the shear strength descended rapidly. When the joining temperature was low,the fracture mostly happened on TiAl side. While the joining temperature became higher,the fracture generally occurred on Cf/ Al side.

关 键 词：复合材料 自蔓延连接 界面组织 接头性能 

分 类 号：TG454[金属学及工艺—焊接]