SUPERPLASTICITY IN TETRAGONAL ZIRCONIA POLYCRYSTAL

Superplasticity in tetragonal zirconia polycrystal is briefly discusse d from the view point of grain size stability and of the role of grain boundary glass phase on the tensile ductility. Extensive ductility of TZP is associated with its grain size stability during high-temperatu re deformation. The ductility is further improved by a suitable additi on of grain boundary glass phase. The elongation to failure in TZP is described as a function of the Zener-Hollomon parameter.