Indentation Contact Deformation of 3Y-TZP at Elevated Temperatures
The contact deformation mechanisms of a superplastic ceramic, 3Y-TZP (3mol % yttria-partially stabilized tetragonal zirconia polycrystals) are examined in indentation creep tests at high temperatures. A large discrepancy between the uniaxial compression and the pyramidal indentation contact behaviors is observed. The indentation creep curves exhibit a hardening behavior, i.e., the penetration rate decreases as the penetration depth and/or the creep time increases. This fact implied that the cooperative grain-boundary sliding (CGBS) in a microscopically localized region, such as the sub-surface contact region beneath a pyramidal indenter, is very limited through the microscopic processes of localized grain interlocking.
T. Ohji, T. Sekino and K. Niihara
H. Muto, R. Yamada, A. Matsuda, M. Sakai, "Indentation Contact Deformation of 3Y-TZP at Elevated Temperatures", Key Engineering Materials, Vols. 317-318, pp. 469-472, 2006