The limited ductility of nanocrystalline metals severely hinders their practical applications
due to the absence of strain hardening. In this study, we observed strain hardening in layer …

The brittle nature of nanocrystalline metals presents a significant challenge to their
widespread application. Extensive efforts have been undertaken to develop materials with …

Ultra-fine grained copper with nanotwins is found to be both strong and ductile. It is expected
that nanocrystalline metals with lamella grains will have strain hardening behaviour. The …

The mechanisms of stress-assisted grain growth are explored using molecular dynamics
simulations of nanoindentation in nanocrystalline Ni and Ni-1 at.% P as a function of grain …

The strength of polycrystalline metals increases with decreasing grain size, following the
classical Hall-Petch relationship. However, this relationship fails when softening occurs at …

Polycrystalline materials with crystallite diameters below hundred nanometer exhibit
extraordinary strength which goes along with a decrease in ductility. In order to tailor tough …

Molecular-dynamics simulations have recently been used to elucidate the transition with
decreasing grain size from a dislocation-based to a grain-boundary-based deformation …

Because of a shift in the dominant deformation mechanisms, the strength/hardness of metals
increases with decreasing grain size down to a critical value, then decreases with further …

Nanocrystalline metals exhibit many excellent mechanical properties and their underlying
deformation mechanisms have been studying widespread. The well-designed atomistic …

In order to study the characteristics of fine grained polycrystalline metals, it is important to
recognize the function of grain boundaries (GB), crystal defects such as dislocation and/or …