Ultrahigh temperature in situ transmission electron microscopy based bicrystal coble creep in Zirconia II: Interfacial thermodynamics and transport mechanisms

Robson L. Grosso, K. S.N. Vikrant, Lin Feng, Eliana N.S. Muccillo, Dereck N.F. Muche, Gowtham S. Jawaharram, Christopher M. Barr, Anthony M. Monterrosa, Ricardo H.R. Castro, R. Edwin García, Khalid Hattar, Shen J. Dillon

Research output: Contribution to journalArticlepeer-review

Abstract

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 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.

Original languageEnglish (US)
Pages (from-to)1008-1021
Number of pages14
JournalActa Materialia
Volume200
DOIs
StatePublished - Nov 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Fingerprint Dive into the research topics of 'Ultrahigh temperature in situ transmission electron microscopy based bicrystal coble creep in Zirconia II: Interfacial thermodynamics and transport mechanisms'. Together they form a unique fingerprint.

Cite this