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：李娟

机构：[1] Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province, Guizhou Institute of Technology, Guiyang, 550003, China; [2] School of Aerospace Engineering, Guizhou Institute of Technology, Guiyang, 550003, China

第一机构：贵州理工学院材料与冶金工程学院

通信机构：Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province, Guizhou Institute of Technology, Guiyang, 550003, China;Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province, Guizhou Institute of Technology, Guiyang, 550003, China|贵州理工学院材料与冶金工程学院;贵州理工学院;

年份：2025

卷号：69

期号：6

起止页码：1593-1605

外文期刊名：Welding in the World

收录：EI(收录号：20244017143150);Scopus(收录号：2-s2.0-85205290013)

语种：英文

外文关键词：Cobalt alloys - Copper alloys - Diffusion bonding - Fracture mechanics - Mercury amalgams - Nickel - Nickel alloys - Shear flow - Shear strength - Tin alloys - Titanium dioxide

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 ℃ 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 ℃, 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. ? International Institute of Welding 2024.