Interfacial Microstructure Evolution and Mechanical Properties of TC4/MgAl_(2)O_(4)Joints Brazed with Ti-Zr-Cu-Ni Filler Metal  

作　　者：Jiafen Song Wei Guo Shiming Xu Ding Hao Yajie Du Jiangtao Xiong Jinglong Li 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,710072,China [2]Shaanxi Key Laboratory of Friction Welding Technologies,Northwestern Polytechnical University,Xi’an,710072,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第12期2057-2067,共11页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51975480 and 52045449);the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(Grant No.2023-TS-11).

摘　　要：In the present study,Ti-Zr-Cu-Ni amorphous filler metal was used to braze MgAl_(2)O_(4)ceramic and Ti-6Al-4V(TC4)at 875,900,925,950,975 and 1000℃for 10 min.The effects of brazing temperature on interfacial microstructure and mechanical properties of the joints were analyzed.The results showed that typical microstructure of the TC4/MgAl_(2)O_(4)joint was solid solution(SS)α-Ti,acicularα-Ti+(Ti,Zr)_(2)(Ni,Cu)layer,metallic glasses and TiO.With the increase in brazing temperature,(Ti,Zr)_(2)(Ni,Cu)layer gradually dispersed at bonding interface,a continuous layer of TiO appears near MgAl_(2)O_(4)ceramic.With the increase in brazing temperature,the hard and brittle(Ti,Zr)_(2)(Ni,Cu)layer gradually dispersed,resulting in the maximum shear strength of 39.5 MPa.The high-resolution TEM revealed the presence of amorphous structure,which is composed of Ti,Zr,Cu,Ni and Al.The values ofδandΔH_(mix)are calculated to be about 8%and−39.82 kJ/mol for the amorphous phase.

关 键 词：BRAZING TC4 titanium alloy MgAl_(2)O_(4) Microstructure High-entropy metallic glasses 

分 类 号：TG14[一般工业技术—材料科学与工程]