Ceramic Research on Transformation Superplasticity and Stoichiometry Efects on Fracture. Final Report

摘要

The research focused on three technical areas, domain boundaries in ferroelectrics, superplasticity associated with phase transitions in ceramics, some of a nonstoichiometric nature and some exposed to exp 60 Co gamma irradiation. The domain boundary studies yielded direct measurements of the widths of 90 exp 0 domain boundaries, the transformational superplasticity studies resulted in the only data to date dealing with strains resulting from superimposed external stresses on ceramics undergoing phase transitions. These results are now being applied to the spinel-olivine transformation relating to plate tectonics, even though the phase transitions that were studied in this project are thermally induced as opposed to pressure induced. Studies of exp 60 Co irradiation effects on CaF sub 2 single crystals show irradiation toughening. (ERA citation 08:002620)