Superplasticity in GeO_2-Doped TZP

摘要

The effect of GeO_2 addition on the superplasticity flow and tensile ductility in TZP was examined. ZrO_2-2.5mol%Y_2O_3-1.0mol% GeO_2 (TZP-1Ge) exhibits lower flow stress and larger tensile elongation than ZrO_2-2.5mol%Y_2O_3 (2.5 Y-TZP) in a temperature range of 1200 and 1550℃. This reduction in flow stress is mainly caused by a reduction in activation energy for plastic flow. Cation's diffusivity must be enhanced by the presence of GeO_2 in TZP. The enhanced ductility in TZP-1Ge can be explained by the reduction in flow stress.