Fully stabilized cubic monocrystals which contained 9.4mol%Y2O3 were studied at temperatures of between 1100 and 1450C by using the stress-pulse etch-pit technique. The stress and temperature dependences of the edge and screw dislocation velocities were measured at stresses which ranged from 60 to 185MPa. It was found that the activation energy for the motion of edge dislocations (5.0eV) was slightly lower than that for screw dislocations (5.6eV). At the lower end of the temperature range, the stress exponent of the edge dislocation velocity was close to unity but increased slightly (to about 3.6) with increasing temperature. The data were explained in terms of a Peierls potential, jog dragging and solute pinning.

B.Y.Farber, A.S.Chiarelli, A.H.Heuer: Philosophical Magazine A, 1995, 72[1], 59-80