Microstructures in Advanced Materials Characterized by HREM and Nanoscale Analysis

Segregation of yttrium induces the formation of Y0.25Zr0.75O2-x and Y0.5Zr0.5O2-y microdomains, with L12- and L10-like ordered structures, in ZrO2–6mol%Y2O3 ceramics in both the sintered and annealed states. The compositions of precipitates such as χL, χS, χSS, and small precipitates formed inside χL, in Cu–11.88Al–5.06Ni–1.63Mn–0.96Ti (wt.%) shape memory alloys have been determined. Under electron beam irradiation, four types of dynamic behavior of the G.P. zones were observed in the Al–6.58Zn–2.33Mg–2.40Cu (wt.%) alloy. The G.P. zone and “G.P. zone-like” defect structures were also distinguished. Lattice distortion profile in the GaAs/InxGa1-xAs superlattice and two-dimensional lattice distortion around a 60° dislocation core in the InAsxP1-x/InP superlattice were determined.