Factors Effect on Grain Refining of Nanocrystalline Copper Fabricated by Explosive Loading and its Dynamic Mechanical Property
By the method of severe plastic deformation at high strain rate of coarse-grained copper under explosively dynamic loading, nanocrystalline(NC) copper was fabricated. The deformation process were simulated recur to Ls-Dyna3d finite element program , the effects of the strain on the degree of grain-refining were analysed. Finally, the dynamic mechanical properties of the NC copper were researched recur to split Hopkinson pressure bar(SHPB). The results show that it is feasible to fabricate nanocrystalline copper by explosively dynamic plastic deformation of coarse-grained copper and the grain size of the NC copper can be controlled less than 100 nanometer; higher strain at high strain rate is beneficial to the grain refining; the distribution of the grain size is not uniform along the loading direction; dynamic yield strength of the NC copper enhences with the decreasing of the average grain size and increasing of the strain rate.
Jinglong Bu, Zhengyi Jiang and Sihai Jiao
J. X. Wang et al., "Factors Effect on Grain Refining of Nanocrystalline Copper Fabricated by Explosive Loading and its Dynamic Mechanical Property", Advanced Materials Research, Vols. 150-151, pp. 1530-1536, 2011