Figure 2
From: Improved high temperature radiation damage tolerance in a three-phase ceramic with heterointerfaces
A comparison of TEM bright field cross section images of Al2O3 single crystal, submicron Al2O3, large grain composite and submicron composite after irradiation (A: Al2O3, Z: YSZ, S: MgAl2O4). The circled grains in the submicron composite are Al2O3. (a) Dark field image of single crystal Al2O3 near [10 \(\overline{1}\) 0] with a g-vector [0006] at 1 μm from the surface. Dislocations lie on {0001} and {0 \(\overline{1}\) 10} as reported1,16. (b) Dislocation loops in submicron Al2O3 clearly show dislocations loops even in small grains. (c) Arrow indicates a large Al2O3 grain with dense dislocation loops in large grain composite at the damage peak. (d) Arrow indicates an Al2O3 grain in submicron composite at the damage peak with salt and pepper contrast, but no dislocation loops.
