U.S. Department of Energy Office of Scientific and Technical Information
Ultrahigh temperature in situ transmission electron microscopy based bicrystal coble creep in Zirconia II: Interfacial thermodynamics and transport mechanisms
Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering; Energy and Nuclear Research Inst., Sao Paulo (Brazil); Univ. of California, Davis, CA (United States). Dept. of Materials Science and Engineering
Purdue Univ., West Lafayette, IN (United States). School of Materials Engineering
Sun Yat-Sen Univ., Zhuhai (China). School of Chemical Engineering and Technology
Energy and Nuclear Research Inst., Sao Paulo (Brazil)
Univ. of California, Davis, CA (United States). Dept. of Materials Science and Engineering
Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Materials, Physical, and Chemical Sciences
This work uses a combination of stress dependent single grain boundary Coble creep and zero-creep experiments to measure interfacial energies, along with grain boundary point defect formation and migration volumes in cubic ZrO2. These data, along with interfacial diffusivities measured in a companion paper are then applied to analyzing two-particle sintering. The analysis presented here indicates that the large activation volume, primarily derives from a large migration volume and suggests that the grain boundary rate limiting defects are delocalized, possibly due to electrostatic interactions between charge compensating defects. The discrete nature of the sintering and creep process observed in the small-scale experiments supports the hypothesis that grain boundary dislocations serve as sources and sinks for grain boundary point defects and facilitate strain during sintering and Coble creep. Model two-particle sintering experiments demonstrate that initial-stage densification follows interface reaction rate-limited kinetics.
Grosso, Robson L., et al. "Ultrahigh temperature <em>in situ</em> transmission electron microscopy based bicrystal coble creep in Zirconia II: Interfacial thermodynamics and transport mechanisms." Acta Materialia, vol. 200, Aug. 2020. https://doi.org/10.1016/j.actamat.2020.08.070
Grosso, Robson L., Vikrant, K. S. N., Feng, Lin, Muccillo, Eliana N. S., Muche, Dereck N. F., Jawaharram, Gowtham S., Barr, Christopher M., Monterrosa, Anthony M., Castro, Ricardo H. R., Garcia, R. Edwin, Hattar, Khalid Mikhiel, & Dillon, Shen J. (2020). Ultrahigh temperature <em>in situ</em> transmission electron microscopy based bicrystal coble creep in Zirconia II: Interfacial thermodynamics and transport mechanisms. Acta Materialia, 200. https://doi.org/10.1016/j.actamat.2020.08.070
Grosso, Robson L., Vikrant, K. S. N., Feng, Lin, et al., "Ultrahigh temperature <em>in situ</em> transmission electron microscopy based bicrystal coble creep in Zirconia II: Interfacial thermodynamics and transport mechanisms," Acta Materialia 200 (2020), https://doi.org/10.1016/j.actamat.2020.08.070
@article{osti_1667415,
author = {Grosso, Robson L. and Vikrant, K. S. N. and Feng, Lin and Muccillo, Eliana N. S. and Muche, Dereck N. F. and Jawaharram, Gowtham S. and Barr, Christopher M. and Monterrosa, Anthony M. and Castro, Ricardo H. R. and Garcia, R. Edwin and others},
title = {Ultrahigh temperature <em>in situ</em> transmission electron microscopy based bicrystal coble creep in Zirconia II: Interfacial thermodynamics and transport mechanisms},
annote = {This work uses a combination of stress dependent single grain boundary Coble creep and zero-creep experiments to measure interfacial energies, along with grain boundary point defect formation and migration volumes in cubic ZrO2. These data, along with interfacial diffusivities measured in a companion paper are then applied to analyzing two-particle sintering. The analysis presented here indicates that the large activation volume, v*=vf+vmprimarily derives from a large migration volume and suggests that the grain boundary rate limiting defects are delocalized, possibly due to electrostatic interactions between charge compensating defects. The discrete nature of the sintering and creep process observed in the small-scale experiments supports the hypothesis that grain boundary dislocations serve as sources and sinks for grain boundary point defects and facilitate strain during sintering and Coble creep. Model two-particle sintering experiments demonstrate that initial-stage densification follows interface reaction rate-limited kinetics.},
doi = {10.1016/j.actamat.2020.08.070},
url = {https://www.osti.gov/biblio/1667415},
journal = {Acta Materialia},
issn = {ISSN 1359-6454},
volume = {200},
place = {United States},
publisher = {Elsevier},
year = {2020},
month = {08}}
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies (CINT)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); São Paulo Research Foundation (FAPESP); Coordination for the Improvement of Higher Education Personnel of Brazil (CAPES); National Council for Scientific and Technological Development (CNPq); US Army Research Office (ARO); US Department of the Navy, Office of Naval Research (ONR)