Nanostructured Materials Nanocrystalline diamond fractured during tensile loading from grain boundary with maximum shear stress Interfacial regions in nanocrystalline SiC with 6 nm grain size. Left: shortest path rings statistics mined amorphous interface atoms (in yellow), right: nanovoids at grain boundaries and triple junctions Metallic glass – nanoglass nanocomposites designs used to compromise strength and ductility in CuZr Bimodal grain size model designed to compromise strength and ductility in CuZr nanoglass