文献类型：期刊文献

英文题名：Microstructure and mechanical characterization of diffusion-bonded CoCrCuFeNi HEA/TC4 titanium alloy joints using a Ni interlayer

作者：Li, Juan Yin, Rong Zhao, Honglong Qin, Qingdong Luo, Shaomin Zhou, Nian

第一作者：黎佳

通信作者：Zhao, HL[1];Qin, QD[1]

机构：[1]Guizhou Inst Technol, Key Lab Light Met Mat Proc Technol Guizhou Prov, Guiyang 550003, Peoples R China;[2]Guizhou Inst Technol, Sch Aerosp 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, Key Lab Light Met Mat Proc Technol Guizhou Prov, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2024

外文期刊名：WELDING IN THE WORLD

收录：;EI(收录号：20244017143150);Scopus(收录号：2-s2.0-85205290013);WOS:【SCI-EXPANDED(收录号:WOS:001322434400001)】；

基金：This work was supported by Guizhou Province Science and Technology Planning Project (Qianke He Jichu ZK (2022) Yiban175), High Level Talent Program of Guizhou Institute of Technology (XJGC20190916), Guizhou Province High Level Innovative Talents (Qianke He Platform and Talent (2022) 011-1), National Natural Science Foundation of China (51964011) and Key Laboratory of Light Metal Materials Processing of Guizhou Province ((2016) 5104), and Natural Science Project of Guizhou Provincial Education Department (Qian JiaoJi (2022) 034) and (Qian jiaoji (2023) 078).

语种：英文

外文关键词：Diffusion bonding; High-entropy alloy; TC4 alloy; Microstructure; Shear strength

摘要：In order to enhance the mechanical properties of the CoCrCuFeNi high entropy alloy (HEA)/TC4 titanium alloy diffusion bonding joints, a Ni foil was chosen as an intermediate layer, resulting in the successful formation of sound joints. Concurrently, an investigation was conducted on the typical microstructure, the influence of temperature on both the microstructure and properties, as well as the mechanism of interfacial formation in the joints. The results indicated that the CoCrCuFeNi HEA/TC4 titanium alloy diffusion-bonded joint, with a Ni intermediate layer, exhibits a characteristic microstructure. This microstructure consists of several distinct layers, including the HEA diffusion layer, Ni(s,s) solid solution layer, TiNi3 layer, TiNi layer, Ti2Ni layer, and TC4 diffusion layer. The interfacial layers were primarily formed by the mutual diffusion of elements and the Ni-Ti diffusion reaction. The joint achieved at 792 degree celsius exhibits the highest shear strength of 230 MPa. This joint exhibits an interfacial structure characterized by a multilayer composition consisting of "HEA/HEA diffusion layer/Ni(s,s)/TiNi3/TiNi/TC4 diffusion layer/TC4". The crack mainly originated in the TiNi3 layer and then spread through multiple interfacial layers. When the bonding temperature exceeded 842 degree celsius, it resulted in the formation of a continuous layer of Ti2Ni compound. The generation of this layer reduced the shear strength of the joint. Consequently, the joint is prone to failure at this brittle layer once it is formed.