1992    
1993    
1994    
1995    
1996    
1997    
1998    
1999    
2000    
2001    
2002    
2003    
2004    
2005    
2006    
2007    
2008    
2009    
2010    
2011    
2012    
2013    
2014    
2015    
2016    
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