Transactions of Materials and Heat Treatment

Title：Research on DB&SPF combination process of double-layer structural parts for 2B06 aluminum alloy

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ClassificationCode：TG146.2

year,vol(issue):pagenumber：2020,45(7):187-191

Abstract：

Based on the advantages of DB&SPF combination process, the preparation of double-layer structural part for 2B06 aluminum alloy was realized by the method of surface alkaline cleaning pretreatment removing oxide film. Then, the influences of surface roughness and diffusion temperatures on the microstructures and properties of diffusion bonding joints for 2B06 aluminum alloy were studied, and the most suitable process parameters of diffusion bonding were obtained. Furthermore, the process parameters of 2B06 aluminum alloy superplastic forming were determined by high temperature uniaxial tensile test and finite element simulation fitting method and so on. The results show that the best diffusion bonding effect is obtained with the bonding pressure of 5 MPa, the maintaining time of 2.5 h and the diffusion temperature of 500~530 ℃, and the oxygen concentration at the joint position effectively decreases by lower surface roughness to improve the quality of joint. However, the shear strength of joint reaches above 78 MPa. Finally, the superplastic forming is performed at 450 ℃ under the strain rate of 0.003 s-1, and the double-layer structural part of 2B06 aluminum alloy with high quality is obtained.

Funds：

国家自然科学基金资助项目（51875122）

王国峰（1973-），男，博士，教授，博士生导师 E-mail：gfwang@hit.edu.cn

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