The hall-petch effect on CuO-doped 3Y-TZP by using single-step sintering

Hall-Petch Theory and Inverse Hall-Petch Theory addressed the relation of grain size and mechanical properties for a material. Both theories explained an opposite effect of grain size toward the strength of the material. 3Y-TZP exhibited both the Hall-Petch Theory and Inverse Hall-Petch Theory, and the effects were distinguished by critical grain size value. The “Pre” and “Post” critical value showed Hall-Petch effect and Inverse effect respectively. This is causing the limitation on the processing of 3Y-TZP, for every processing requires to determine the critical value to understand mechanical behavior of the material. With the sintering aides, CuO, the phenomenon was greatly reduced and minimized. Without the coexisting of both mentioned effects, the processing and application of doped-3Y-TZP will be extended without iteratively experimental work to determine the critical value.