Anomalous high activation energy for creep in nanostructured 3YTZP/Ni cermets |
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| Affiliation: | 1. Departamento de Física de la Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain;2. Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain;1. Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA;2. Saxon Glass Technologies, Inc., Alfred, NY 14802, USA;1. Institute of High Pressure Physics of the Polish Academy of Sciences, ul. Soko?owska 29/37, 01-142, Warsaw, Poland;2. Department of Chemistry, Warsaw University of Technology, ul. Nowakowskiego 3, 00-664, Warsaw, Poland;1. College of Energy, Xiamen University, Xiamen, 361102, China;2. Science and Technology on Reactor Fuel and Materials Laboratory, Chengdu, 610213, China;3. Science and Technology on Reactor System Design Technology Laboratory, Chengdu, 610213, China;4. Fujian Provincial Nuclear Energy Engineering Technology Research Center, Xiamen, 361102, China;5. Nuclear Power Institute of China, Chengdu, 610213, China |
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| Abstract: | The plastic behavior of cermets based on a 3 mol% yttria-stabilized tetragonal zirconia matrix that incorporates nanometric nickel inclusions (3YTZP/n-Ni), with 2.5, 5 and 10 vol.% of nickel content, has been studied by constant load tests in compression carried out in argon atmosphere. The microstructure of these composites consists of nanometric nickel inclusions homogeneously dispersed into a fine-grained zirconia matrix (about 200 nm). The microstructural and mechanical results obtained show that the creep behavior is controlled by the zirconia matrix as in 3YTZP-based cermets with micrometric Ni inclusions (3YTZP/μ-Ni); whereas the stress exponent values are similar to those of high-purity monolithic 3YTZPs, anomalous high values of the activation energy have been measured. The ceramic/metal interface plays a crucial role for creep properties; the strong TZP/n-Ni interface matching can be at the origin of these high values of the activation energies for creep. |
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