Stress relaxation and solid solution hardening of cubic ZrO2 single crystals |
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| Affiliation: | 1. Max Planck Institute for Microstructure Physics, Weinberg 2, D-06120 Halle, Saale, Germany;2. Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, U.S.A.;1. CIEFMA—Department of Materials Science and Metallurgical Engineering, ETSEIB, Universitat Politècnica de Catalunya, 08028 Barcelona, Spain;2. CRnE, Campus Diagonal Sud, Edifici C’, Universitat Politècnica de Catalunya, 08028 Barcelona, Spain;3. Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden;1. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China;2. Analysis and Test Center, Sichuan University, Chengdu 610064, PR China;3. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, PR China;4. College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu 610059, PR China;5. INNOVICES SARL, 92100 Boulogne, Billancourt, France;1. Anhui Key Laboratory of Information Materials and Devices, School of Physics and Materials Science, Anhui University, Hefei 230601, People''s Republic of China;2. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People''s Republic of China |
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| 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°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. |
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