Synthesis of Bulk Nanostructured DO22 Superlattice of Ni3(Mo, Nb) with High Strength, High Ductility, and High Thermal Stability
Figure 3
Crystallographic features of the DO22 superlattice. (a) Atoms arrangement viewed along <100> direction of the parent fcc lattice showing the tetragonal unit cell of the DO22 superlattice: large circles are Mo/Nb atoms (closed circles are atoms at level 0, 1 and open circles are atoms at level 1/2). (b) A schematic of the corresponding <100> reciprocal lattice intersection showing the characteristic DO22 superlattice reflections at , , and positions as indicated by the arrows. (c), (d), and (e) are selected-area diffraction patterns derived from specimens aged 24 hours at 700°C in <100>, <110>, and <112> orientations, respectively; the superlattice reflections are indicated by the arrows.
