Study on the Fabrication of Nanocrystalline Copper by Explosive Dynamic Loading

Abstract:

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.

• Periodical: Materials Science Forum (Volumes 667-669)
• Pages: 109-114
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.667-669.109
• Online since: December 2010
• Authors: Jin Xiang Wang, Nan Zhou, Rui Yang
• Keywords: Explosive Loading, Grain-Refining Mechanism, Nanocrystalline Copper, Strain, Strain Rate, Temperature

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