**3. Microstructure-mechanical properties correlation of nanostructured pure FCC metals**

This section is divided into three subsections. The subsection on size-dependent deformation mechanisms is introduced based on a deformation-mechanism map. Microstructural evolution, in particular, the steady-state grain size, is then discussed in terms of a dislocation-based mechanism. The mechanical properties subsection contrasts yield strength, ductility, strainrate sensitivity, and fatigue lifetime in NS metals.
