Transactions of Materials and Heat Treatment

Title：Low temperature diffusion bonding on TC4 titanium alloy with Ni-Co nano-coating as intermediate layer

Authors： Wang Guofeng Liu Yongkang Liu Qing Zhang Jingxuan Wang Yuelin

Unit： School of Materials Science and Engineering Harbin Institute of Technology National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology AECC Shenyang Liming Aero Engine Co. Ltd. Shenyang Aircraft Corporation

KeyWords： TC4 titanium alloy Ni-Co nano-coating low-temperature diffusion bonding shear strength diffusion coefficient

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2022,47(11):239-245

Abstract：

For the problems that titanium alloys are easily deformed during high-temperature diffusion bonding, and the requirements of diffusion equipment and molds are strict, the Ni-Co nano-coating was electrodeposited on the surface of TC4 titanium alloy as an intermediate layer to reduce the temperature of diffusion bonding. Therefore, the influence laws of Co content on the microstructure and properties of Ni-Co nano-coating were studied. When Co content was 20 g·L-1, the surface of coating was smooth, the hardness was the highest which was 537.6 HV, and the grain size was the smallest which was 19.2 nm. When the thickness of coating was 2.5 μm and the diffusion bonding temperature was 800 ℃, the shear strength of welded joint reached 543.4 MPa, which was 61.4% higher than that of the welded sample without intermediate layer. As an intermediate layer, the Ni-Co nano-coating improves the diffusion coefficient of atoms and realizes the high-quality diffusion bonding of TC4 titanium alloy at low temperature and in low vacuum environment, which is of great significance for engineering application.

Funds：

民机专项科研项目（MJZ-2018-G-59）

作者简介：王国峰（1973-），男，博士，教授，E-mail：gfwang@hit.edu.cn

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