Title: Plastic deformation of cubic zirconia single crystals at 1400 degrees C
Authors: Baufeld, Bernd ×
Baither, D
Bartsch, M
Messerschmidt, U #
Issue Date: Mar-1998
Publisher: Wiley-v c h verlag gmbh
Series Title: Physica status solidi a-applied research vol:166 issue:1 pages:127-153
Abstract: Cubic zirconia single crystals stabilized with 11 mol% yttria were deformed in air at 1400 degrees C and around 1200 degrees C at different strain rates along [1 (1) over bar 2] and [100] compression directions. The strain rate sensitivity of the flow stress was determined by strain rate cycling and stress relaxation tests. The microstructure of the deformed specimens was investigated by transmission high-voltage electrum microscopy, including contrast extinction analysis for determining the Burgers vectors as well as stereo pairs and wide-angle tilting experiments to find the active slip planes. At deformation along [1 (1) over bar 2], the primary and secondary slip planes are of {100} type. Previous experiments had shown that the dislocations move easily on these planes in an athermal way. During deformation along [100], mainly dislocations on {110} planes are activated, which move in a viscous way by the aid of thermal activation. The discussion of the different deformation behaviours during deformation along [1 (1) over bar 2] and [100] is based on the different dynamic properties of dislocations and the fact that recovery is an essential feature of the deformation of cubic zirconia at 1400 degrees C. The results on the shape of the deformation curve and the strain rate sensitivity of the flow stress are partly at variance with those of previous authors.
ISSN: 0031-8965
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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