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Effect of cation doping on lattice and grain boundary diffusion in superplastic yttria-stabilized tetragonal zirconia
Authors:Marek Boniecki  Yuriy Natanzon  Zbigniew Łodziana
Affiliation:1. Institute of Electronic Materials Technology, 133 Wólczyńska Str., 01-919 Warsaw, Poland;2. The Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, 152 Radzikowskiego Str., 31-242 Cracow, Poland;3. Department of Enviroment, Energy and Mobility EPMA, 8600 Dübendorf, Switzerland;1. Department of Aerospace Engineering, Indian Institute of Space Science and Technology, India;2. Materials and Metallurgy Group, Vikram Sarabhai Space Centre, India;3. National Aerospace Laboratories, India;1. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, PR China;2. Shanghai Pinghe Bilingual School, Shanghai 201206, PR China;1. Temasek Laboratories, Nanyang Technological University, 637553, Singapore;2. School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore;3. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;4. Advanced Light Source (ALS), Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA 94720, USA;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China;3. School of Materials Science and Engineering, North University of China, Taiyuan 116028, China;4. State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract:Lattice diffusion coefficients Dl and grain boundary diffusion Dgb coefficients of hafnium were studied for 0.5 and 1 mol% cation-doped yttria-stabilized tetragonal zirconia at the temperature range from 1283 to 1510 °C. The diffusion profiles were determined by two experimental techniques: secondary ion mass spectroscopy and electron microprobe analysis. Additionally the first principle calculations of the electronic states of Zr4+, dopant cations and O2? anions and elastic properties in 3Y-TZP were performed. Superplastic strain rate versus stress and inverse temperature was also measured. For 1 mol% doped samples the significant increase of the grain boundary diffusion and superplastic strain rate was observed. Correlations between the calculated ionic net charges and Dgb indicate that enhancement of Dgb was caused by the reduction of ionic bonding strength between metal cation and oxygen anion in zirconia. The new constitutive equation for superplastic flow of yttria-stabilized tetragonal zirconia ceramics was obtained.
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