Promotion mechanism of electric current on SiC_p/Al composite material deformation

Abstract

To solve the problem of poor formability of SiC_p/Al composite material, enhance the efficiency and reduce the consumption, current is adopted in hot forming process. Under the action of current, the plastic forming performance has made a huge improvement. It is verified that the detour flow and concentration of electrons may lead to a local liquid layer. In addition, the current flows through the crack tip can relax the stress concentration and prevent the propagation of crack. Otherwise, drifting electrons would collide with dislocation which generates electron wind force to make the dislocations arrange along the current direction. Therefore the electric current can enhance the formability of SiC_p/Al composite material and improve the quality of forming part.

Keywords:

• SiC_p/Al composite
• Resistance heating
• Deformation
• Mechanism

Acknowledgements

This work was supported by the National Natural Science Foundation of China (grant no. 51175112) and program for Changjiang Scholars and Innovative Research Team in University (grant no. IRTl229).