Metallic Glasses and NanoGlasses Deformation of a metallic glass under cyclic loading. Colors indicate the atomic local shear strain and w is the shear band width Nanopillars made pure nanoglass (NG) or nanocomposites of layered metallic glass (MG) or alternating layers of MG and NG Nanoglass (NG) nanopillars with 50 nm diameter with different average grain size used in tensile loading testing Metallic glass nanopillars with smooth, single notched, and rough surfaces used to evaluate the effect of surface roughness on the brittle-to-ductile transition as a function of size reduction Tensile loading of CuZr metallic glass and nanoglasses of different grain sizes showing the transition from brittle shear banding to homogeneous failure