A. Mishra

TL;DR: The mechanical properties of nanocrystalline materials are reviewed in this paper, with emphasis on their constitutive response and on the fundamental physical mechanisms, including the deviation from the Hall-Petch slope and possible negative slope, the effect of porosity, the difference between tensile and compressive strength, the limited ductility, the tendency for shear localization, fatigue and creep responses.

TL;DR: In this article, the evolution of microstructure and the mechanical response of copper subjected to severe plastic deformation using equal channel angular pressing (ECAP) was investigated, and it was shown that the microstructures produced through adiabatic shear localization during high strain rate deformation and ECAP are very similar.

TL;DR: In this article, a modified Johnson-Cook constitutive equation was found to closely capture the dynamic response of ultra-fine-grained (UFG) copper with respect to its deformation.

TL;DR: In this article, the mechanisms of microstructural evolution in copper subjected to equal channel angular pressing (ECAP) have been investigated after successive passes, where the first few passes are the most efficient in grain refinement while the microstructure becomes gradually more equiaxed as the number of passes increases.

TL;DR: A review of the principal mechanisms responsible for the plastic deformation of nanocrystalline metals can be found in this article, where the authors show that with a decrease in grain size there is a gradual shift in the relative importance of the deformation mechanisms away from the ones operating in the conventional polycrystalline domain.