High temperature plasticity in yttria stabilised tetragonal zirconia polycrystals (Y-TZP). (September 2013)

• Record Type: Journal Article
• Authors: Domínguez-Rodríguez, A.; Gómez-García, D.; Wakai, F.
• Is Part Of: International materials reviews. Volume 58:Number 7(2013)
• Page Start: 399
• Page End: 417
• Publication Date: 2013-09
• Subjects: High temperature plasticity, -- Y-TZP; Materials science -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemical engineering -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1179/1743280413Y.0000000018
• Languages: English
• ISSNs: 0950-6608

Abstract

Abstract : The literature data on the superplastic deformation of high purity yttria stabilised tetragonal zirconia polycrystals is reviewed in detail. It is shown that, based on the existence of a threshold stress, the single mechanism of grain boundary sliding (GBS) accommodated by diffusional processes can explain the superplasticity of these materials over all the ranges of temperature, stress, grain size, and surrounding atmosphere that have been studied. The origin of the threshold stress and its quantitative dependence on temperature and grain size is explained in terms of the segregation of yttrium atoms at the grain boundaries. A new model for GBS accommodated by lattice or grain-boundary diffusion is presented which can explain the transition of the stress exponent from 2 to 1.