Abstract
Yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) is common superplasticity ceramics and its deformation behavior at high temperatures is influenced strongly by trace impurities such as silica and alumina. Low purity materials more than 0.1% show only one region of stress exponent 2, while high purity materials show two deformation behavior region with stress exponent 2 at high stresses and 3 at low stresses. In the present study, another deformation region with stress exponent 1 at lower stresses is observed in high purity 3Y-TZP, by means of constant cross-head speed compression tests and constant load compression creep tests.
