Journal
ACTA MATERIALIA
Volume 136, Issue -, Pages 224-234Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.07.005
Keywords
Nanocrystalline materials; Grain growth; Grain boundary enrichment; Ceramics
Funding
- DMR Ceramics [1055504, 1609781]
- Army Research Office [W911NF-16-1-0364]
- College of Engineering, Health Sciences Center, Office of the Vice President for Research
- Utah Science Technology and Research (USTAR) initiative of the State of Utah
- MRSEC Program of the NSF [DMR-1121252]
- Direct For Mathematical & Physical Scien [1609781] Funding Source: National Science Foundation
- Division Of Materials Research [1609781] Funding Source: National Science Foundation
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This work presents a thorough analysis of the grain growth behavior of gadolinium doped yttria stabilized zirconia (YSZ). The effect of the dopant on the thermodynamics as well as on the kinetics of the process is reported by providing extensive experimental data. While normal grain growth following a parabolic growth relation was observed, gadolinium inhibited the process proportionally to its concentration. By using microcalorimetry, we showed that the dopant decreases the grain boundary energy of YSZ, and hence reduces the driving force for growth. Analysis of the growth profile at different temperatures and times indicate that gadolinium does not significantly affect the grain boundary mobility or the activation energy for grain growth. The results rationalize that the dopant is acting on a mostly thermodynamic basis and opens good perspective for design of coarsening control focused on the system energetics. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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