Ultrahigh temperature in situ transmission electron microscopy based bicrystal coble creep in zirconia I: Nanowire growth and interfacial diffusivity
| Autor: | K.S.N. Vikrant, R. Edwin García, Anthony M. Monterrosa, Christopher M. Barr, Ricardo H. R. Castro, Eliana N. S. Muccillo, Shen J. Dillon, Dereck N.F. Muche, Gowtham S. Jawaharram, Lin Feng, Robson L. Grosso, Khalid Hattar |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Coble creep Materials science Polymers and Plastics Doping Metals and Alloys Analytical chemistry Nanowire 02 engineering and technology 021001 nanoscience & nanotechnology Thermal diffusivity 01 natural sciences Electronic Optical and Magnetic Materials Creep Phase (matter) 0103 physical sciences Ceramics and Composites Cubic zirconia Grain boundary 0210 nano-technology |
| Zdroj: | Acta Materialia. 199:530-541 |
| ISSN: | 1359-6454 |
| Popis: | This work demonstrates novel in situ transmission electron microscopy-based microscale single grain boundary Coble creep experiments used to grow nanowires through a solid-state process in cubic ZrO2 between ≈ 1200 °C and ≈ 2100 °C. Experiments indicate Coble creep drives the formation of nanowires from asperity contacts during tensile displacement, which is confirmed by phase field simulations. The experiments also facilitate efficient measurement of grain boundary diffusivity and surface diffusivity. 10 mol% Sc2O3 doped ZrO2 is found to have a cation grain boundary diffusivity of D g b = ( 0.056 ± 0.05 ) exp ( − 380 , 000 ± 41 , 000 R T ) m 2 s − 1 , and surface diffusivity of D s = ( 0.10 ± 0.27 ) exp ( − 380 , 000 ± 28 , 000 R T ) m 2 s − 1 . |
| Databáze: | OpenAIRE |
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