Superplastic Deformation mechanisms During Creep of Alumina-zirconia Composites

摘要

The high temperature creep of three alumina-zirconia composites (alumina volume fraction: 20/100, 50/100 and 80/100) and of the end-constituents (Y-PSZ and alumina) has been studied as a function of stress (4-200 Mpa), temperature (1275-1400 deg C) and grain size (0.4-2μm). The deformation of the end-constituents results from two serial mechanisms (interface reaction and diffusion, preponderant at low or high stress, respectively). The shape of the creep rate-stress curves of composites was similar to that of the end-constituents, suggesting similar deformation mechanisms.