Study on the Fabrication of Nanocrystalline Copper by Explosive Dynamic Loading
By the method of severe plastic deformation at high strain rate of coarse-grained copper under explosively dynamic loading, nanocrystalline copper with the average grain size less than 200 nanometer was fabricated. The mechanism of grain-refining was investigated by means of transmission electron microscopy. Finally, the deformation processes were simulated using Ls-Dyna3d finite element program and the effects of the strain, strain rate as well as temperature rise on grain-refining were analysed systematically. The results show that it is feasible to fabricate nanocrystalline copper by explosively dynamic plastic deformation of coarse-grained copper; twin crystal and dislocation are the main mechanism of grain-refining; higher strain and lower temperature rise are beneficial to the grain refining; the distribution of the grain size is not uniform along the loading direction.
Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon
J. X. Wang et al., "Study on the Fabrication of Nanocrystalline Copper by Explosive Dynamic Loading", Materials Science Forum, Vols. 667-669, pp. 109-114, 2011