Influence of Pulsed Current on Superplasticity of Fine Grained 1420 Al-Li Alloy

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Zhang, Yanling^1,2,3 ; Hou, Hongliang^1,2,3 ; Bi, Jing^1 ; Wang, Yaoqi^1,2,3

Beijing Aeronautical Manufacturing Technology Research Institute, Beijing

100024, China^1

Aeronautical Key Laboratory for Plastic Forming Technologies, Beijing

100024, China^2

Beijing Key Laboratory of Digital Plasticity Forming Technology and Equipment, Beijing

100024, China^3

关键词: 1420 Al-Li alloys;    Average grain size;    Electrical parameter;    Electropulse;    Fine grained;    Pulsed currents;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012080/pdf
DOI  :  10.1088/1757-899X/301/1/012080

来源: IOP

【 摘 要 】

The effects of an externally applied electropulse on the superplastic deformation behavior and microstructure of 1420 Al-Li alloy were studied. The flow stress of superplastic deformation was reduced by the high-density electropulse while the elongation was increased. The optimal electrical parameters for superplastic deformation were 192A/mm2of current density, 150Hz of frequency and 30s of duration at 480°C and 0.001s-1. The elongation raised by 68% compared to that without electropulse. Furthermore, the grain was refined and the average grain size was reduced after superplastic deformation with the optimal electropulse. It is noted that the electropulse promoted the recrystallization and restrained the grain growth.