Effect of Enhanced Atomic Diffusion on Microstructure Evolution of Heterogeneous Friction Welded Joints

4th Annual International Workshop on Materials Science and Engineering

Wei, Yanni^1 ; Sun, Fu^2

Department of Materials Science and Engineering, Xi'An University of Technology, 5 South Jinhua Road, Xi'an

710048, China^1

Shaanxi Zhituo Solid-State Additive Manufacturing Technology Co. Ltd., 70 west of chaoyang street, Weinan

714000, China^2

关键词: Enhanced diffusion;    Friction-welded joints;    Heterogeneous interfaces;    Linear relationships;    Micro-structure evolutions;    Physical simulation;    Severe plastic deformations;    Thermally activated;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/381/1/012031/pdf
DOI  :  10.1088/1757-899X/381/1/012031

来源: IOP

【 摘 要 】

In this paper, the dissimilar pure metal diffusion couples with different metallurgical compatibility (Cu/Ni miscible couple, Mg/Ti immiscible couple) were designed and a physical simulation apparatus of rotation friction welding was used to investigate the diffusion of the heterogeneous interface during severe plastic deformation. The experimental results showed that an interface layer which presented the gray gradient transition characteristics appeared at Cu/Ni interfaces. The diffusion rate was calculated and was 104 times of that of thermally activated at the same temperature for Cu/Ni couple. The enhanced diffusion was also observed on the Mg/Ti friction welded joints. The diffusion coefficients under different strain rate were obtained and the phenomenological law between diffusion coefficient and strain rate were analysed. A linear relationship between diffusion coefficient and strain rate was obtained.