Messerschmidt, U., Baufeld, B., Baither, D. and Bartsch, M., McClellan, K. J., Heuer, A. H.
Dislocation processes during the plastic deformation of cubic zirconia single crystals.
[Conference Paper] Strength of Materials. Fundamental Physical Aspects of the Strength of Crystalline Materials. ICSMA 10th Proceedings of the 10th International Conference.pp 741-744 (Eds.) Oikawa, H., Maruyama, K., Takeuchi, S. and Yamaguchi, M.,The Japan Institute of Metals, (1994)
c-ZrO2 single crystals of a Y2O3 content between 12.7 and 20.5 mol% have been deformed at 1400 degrees C. Thermally activated processes were investigated by strain rate cycling and stress relaxation experiments. At the yield point the strain rate sensitivity is very small and the relaxation curves have an inverse curvature. In situ straining experiments in a high-voltage electron microscope at 1150 degrees C show that the dislocations move very jerkily, in accordance with athermal behaviour revealed by macroscopic tests. The high-temperature properties seem to be controlled by recovery but are not yet well understood. The flow stress at 1150 degrees C can, however, well be interpreted by long-range dislocation interactions.
ki-1994-d01