Microstructure and mechanical properties of TC4/0Cr18Ni9 joint prepared by transient liquid phase diffusion bonding

• Published in: Materials research express Vol. 6; no. 10; pp. 1065 - 1072
• Main Authors: Jie, Wang, Yang, Feng, Hao, Li, Jin, Yang, Haotian, Yang, Fuqi, Zhang
• Format: Journal Article
• Language: English
• Published: IOP Publishing 11.09.2019
• Subjects: diffusion bonding; mechanical properties; microstructure; stainless steel; titanium alloy; transient liquid phase
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/ab3fde

Because of significant difference in physical and chemical properties, the welding of titanium alloy and stainless steel is difficult. In order to solve the problems, TC4/0Cr18Ni9 joints were prepared by transient liquid phase (TLP) diffusion bonding using CuZn alloy as interlayer, and the microstructure, mechanical properties and bonding mechanism were studied and discussed. According to the morphological observation of interfaces and fracture surfaces, characterization of phases, tests of shear performance and micro hardness by scanning electron microscopy (SEM) with energy dispersive x-ray spectrometer (EDS), x-ray diffraction (XRD), universal testing machine, vickers micro-hardness tester and so on, CuZn alloy has good wettability and compatibility with TC4 and 0Cr18Ni9 as a interlayer material. Gradient structural joints are formed by sufficient element diffusion and reactions during TLP diffusion bonding. Compared with the interface bonding area adjacent 0Cr18Ni9 side, the joining area adjacent TC4 side is more continuous and denser without obvious defect. Hardness gradually increases from 0Cr18Ni9 side to diffusion reaction layer adjacent TC4, and then slightly reduces form diffusion reaction layer to TC4. The shear strength of TC4/0Cr18Ni9 joint can reach 146.4 5.0 MPa and the fracture is not completely brittle. Ti2Cu and FeZn13 can be detected on the fracture surface of TC4/0Cr18Ni9 joint, which indicates fracture is apt to take place in the interface region adjacent 0Cr18Ni9 side.