文献类型：期刊文献

英文题名：Enhancing the interfacial strength of TiVNbTa refractory high entropy alloy joint for vacuum brazed via convex structure with nano-precipitates

作者：Yu, Tingxiao Zhao, Honglong Qin, Qingdong Feng, Kai Li, Juan Yang, Chuang Zeng, Yu

第一作者：Yu, Tingxiao

通信作者：Qin, QD[1];Li, J[1]|[14440c17cf7bd1f4ff05e]秦庆东;[144400fa133c5f6c59dc2]秦庆东;

机构：[1]Guizhou Inst Technol, Dept Mat & Energy Engn, Guiyang 550003, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China;[3]Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China;[4]Guizhou Normal Univ, Sch Mat & Architecture Engn, Guiyang 550003, Peoples R China

第一机构：贵州理工学院

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

年份：2026

卷号：953

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：;EI(收录号：20260219899727);Scopus(收录号：2-s2.0-105027245965);WOS:【SCI-EXPANDED(收录号:WOS:001669309200001)】；

基金：This work was supported by the Major Science and Technology Special Project of Guizhou Province (Qiankehe Rencai XKBF [2025] 008), Guizhou Province High Level Innovative Talents (No. Qianke He Platform and Talent (2022) 011-2), Natural Science Project of Guizhou Provincial Education Department (Qian jiaoji (2023) 078), Guizhou Province Science and Technology Planning Project (Qianke He Jichu ZK [2022] Yiban192 and Qianke He Rencai KJFZ [2025] 018 ), Guizhou Province Youth Science and Technology Talent Support Project, The authors would like to thank Dr. Lilin Xie from Center of Electron Microscopies, Institute of Quantum Materials and Physics, Henan Academy of Sciences for supporting of TEM analysis; and also extends thanks to Shijiazhuang Xindong Technology Service Co., Ltd. for providing the Thermo-Calc calculation data; and also thanks to Guiyang Bauxite deep processing science and technology small yard.

语种：英文

外文关键词：Refractory high-entropy alloys; Vacuum brazing; Convex structure; Nano-precipitates; Mechanical properties

摘要：Achieving a high-quality joint in refractory high-entropy alloys (RHEAs) remains a significant challenge. In the present study, an appropriate filler metal of TiZrCuNi was selected to successfully join TiVNbTa RHEA using vacuum brazing. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and shear tests were used to systematically study the interfacial microstructure and mechanical properties of the joints. The results showed that the brazing seam consists of a diffusion-affected zone (Zone I) and a central brazed zone (Zone II), with a convex structure formed between these two zones. TEM images revealed alpha-Ti(Zr) nano-precipitates in Zone I. As the brazing temperature increased, the thickness of Zone I gradually increased, while the volume fraction of the blocky alpha-Ti phase in Zone II significantly decreased. The shear strength of the joints initially increased and then decreased with rising brazing temperature, reaching an optimal value of 179 +/- 8 MPa after brazing at 880 degrees C for 15 min. The enhanced bonding strength of the joint is attributed to the interlocking effect of the convex structure and nano-precipitation strengthening. This study provides valuable insights into the welding challenges of TiVNbTa RHEA, offering guidance for achieving high-quality welding of RHEAs.