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Title: Stress-relaxation and solid-solution hardening of cubic zro2 single-crystals
Authors: Messerschmidt, U ×
Baufeld, Bernd
Mcclellan, Kj
Heuer, Ah #
Issue Date: May-1995
Publisher: Pergamon-elsevier science ltd
Series Title: Acta metallurgica et materialia vol:43 issue:5 pages:1917-1923
Abstract: Solid solution hardening in cubic ZrO2 single crystals of varying Y2O3 contents (12.7, 15.2, 17.7, and 20.5 mol %) oriented for easy {100} [011] slip has been studied at 1400 degrees C. Strain rate cycling and stress relaxation experiments have been performed to characterize the thermally-activated deformation processes. The strain rate sensitivity is very low at small strains but increases with increasing strain; the values measured by stress relaxation are greater than those derived from the strain rate cycling experiments, and the relaxation curves show ''inverse'' curvature at small strains. The athermal component of the flow stress originating. from long-range dislocation interactions was estimated from dislocation densities obtained from etch pit micrographs. The dislocation density increases with increasing Y2O3 concentration, but the densities are too small to cause the appreciable athermal component of the flow stress; we believe that significant recovery must have occurred during cooling. The stress relaxation data can be interpreted by assuming that the deformation itself is mainly athermal, but that thermally-activated recovery takes place during the deformation; the Y2O3 solute may cause hardening by decreasing the diffusion kinetics. Alternatively, it is possible that the flow stress is controlled by the intrinsic lattice resistance of secondary slip systems.
URI: 
ISSN: 0956-7151
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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