文献类型：期刊文献

英文题名：Effect of Temperature on Microstructure and Mechanical Properties of CoCrFeNi/TC4 Diffusion-Bonded Joints

作者：Yang, Kai Qin, Qingdong Li, Juan Zhao, Honglong Zhang, Nianbing

第一作者：Yang, Kai

通信作者：Li, J[1];Zhang, NB[1];Li, J[2]

机构：[1]Guizhou Normal Univ, Sch Mat & Construct, Guiyang 550003, Peoples R China;[2]Guizhou Inst Technol, Dept Mat & Energy Engn, Guiyang 550003, Peoples R China

第一机构：Guizhou Normal Univ, Sch Mat & Construct, Guiyang 550003, Peoples R China

通信机构：corresponding author), Guizhou Normal Univ, Sch Mat & Construct, Guiyang 550003, Peoples R China;corresponding author), Guizhou Inst Technol, Dept Mat & Energy Engn, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2025

外文期刊名：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

收录：;EI(收录号：20254419416959);Scopus(收录号：2-s2.0-105020050219);WOS:【SCI-EXPANDED(收录号:WOS:001604029300001)】；

基金：This work was supported by the Guizhou Province Natural Science Basic Research Planning Project (Qianke He Jichu MS [2025] 183), Guizhou Province High Level Innovative Talents (No. Qianke He Platform and Talent (2022) 011-1), Natural Science Project of Guizhou Provincial Education Department (Qian Jiaoji (2023) 078), Guizhou Science and Technology Support Program (Qianke He Zhicheng DXGA [2025] Yiban 004), Guizhou Province Youth Science and Technology Talent Support Project, The Major Science and Technology Special Project of Guizhou Province (Qiankehe Rencai XKBF [2025] 008).

语种：英文

外文关键词：CoCrFeNi; mechanical properties; microstructure; TC4

摘要：To enhance corrosion resistance and reduce costs of oil pipeline precision components, this study utilizes vacuum diffusion bonding to join conventional TC4 titanium alloy (TC4) with CoCrFeNi high-entropy alloy (HEA), ensuring required welding precision for industrial applications. An investigation was carried out to explore how the bonding temperature influences the microstructure evolution and mechanical properties of the resulting joint. The typical interfacial microstructure of the joint comprises TC4 base metal, a TC4 diffusion layer, an XTi2 layer, a YTi layer, a Z2Ti layer, a CoCrFeNiTi0.5 high-entropy layer, and CoCrFeNi base metal. The XTi2 layer exhibited a discontinuous, needle-like morphology, while the other layers displayed smooth interfaces with clearly defined interlayer boundaries. At 800 degrees C, the mechanical performance of the CoCrFeNi/TC4 diffusion-bonded joint was the highest with an average shear strength of 164 MPa, equivalent to 70% of the CoCrFeNi base metal's strength. At temperatures below 800 degrees C, the poor performance of the joint can be attributed to incomplete bonding and void defects at the interface. However, when the bonding temperature exceeds 800 degrees C, accelerated atomic diffusion promotes the formation of abundant IMCs. Concurrently, the mismatch in coefficients of CTE between the materials induces escalating internal stress. This synergistic effect of IMC formation and thermal stress leads to microcrack initiation at the interface when the bonding temperature reaches 850 and 900 degrees C. These synergistic effects reduce the mechanical properties of the joints.