Figure 2.

(a,b) Atomic-level structures of crystalline metals vs. metallic glasses [69]. (a) High-resolution TEM image of crystalline low-carbon steel showing well-defined and long-range order packing of lattice planes. (Inset) The corresponding selected-area electron diffraction (SAED) pattern showing sharp crystalline spots; and (b) high-resolution TEM images of a Zr₆₇Ni₃₃ metallic glass, illustrating a prototypical maze-like pattern in MGs. (Inset) The corresponding SEAD pattern of MG exhibits diffusive haloes; and (c,d) using nanometer diameter electron beam diffraction, short- and medium-range order (SRO and MRO) in MGs become evident [70].