Towards (predictive) structure-property relationships for heterophase interfaces in oxides

Vinayak P Dravid*, Elizabeth C. Dickey, Alexandre Revcolevschi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Several advanced TEM techniques have been utilized to probe the atomic scale details of structure, local chemistry and bonding of interfaces in directionally solidified eutectic (DSE) of NiO-ZrO2 (ss). The three-dimensional residual stress tensor for NiO-ZrO2 (ss) DSE was directly determined using x-ray diffraction measurements. Crack trajectories induced by indentation were followed by electron backscattered diffraction (EBSD) in an SEM. Several general trends in interface structure-crack propagation behavior seem to emerge from our collective analysis. Oxide-oxide DSEs are characterized by strong electrostatic bonding across the heterophase interfaces mediated by a common oxygen plane. The strong interfacial bonding is manifested in the large residual stresses in the composites which are both spatially and crystallographically anisotropic. Crack propagation trajectories appear to be influenced by micro-scale features such as residual stresses and microstructural imperfections. It is argued that while dominant microstructural features which seem to dictate crack trajectories are microscale, the origin and interdependence of atomic scale features and events are intimately connected to the larger length-scale phenomena. Thus, the results reinforce the notion that all microstructural length-scales are of significance in macroscale properties and phenomena in materials in general, and internal interfaces, in particular.

Original languageEnglish (US)
Title of host publicationBoundaries
PublisherMinerals, Metals & Materials Soc (TMS)
Pages169-177
Number of pages9
StatePublished - Jan 1 1998
EventProceedings of the 1997 TMS Fall Symposium - Indianapolis, IN, USA
Duration: Sep 14 1997Sep 18 1997

Other

OtherProceedings of the 1997 TMS Fall Symposium
CityIndianapolis, IN, USA
Period9/14/979/18/97

ASJC Scopus subject areas

  • Engineering(all)

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    Dravid, V. P., Dickey, E. C., & Revcolevschi, A. (1998). Towards (predictive) structure-property relationships for heterophase interfaces in oxides. In Boundaries (pp. 169-177). Minerals, Metals & Materials Soc (TMS).