In-situ microcantilever deflection to evaluate the interfacial fracture properties of binary Al2O3/SmAlO3 eutectic

Yong Hui Ma, Zhi Gang Wang, Jia Hu Ouyang, Shen J. Dillon, Lin Feng, Yu Jin Wang

Research output: Contribution to journalArticlepeer-review


This study aims to elucidate the impact of interfacial microstructure and properties on fracture toughness in binary Al2O3/SmAlO3 eutectic and its polycrystalline samples via in-situ microcantilever deflection tests. Al2O3-SmAlO3 eutectic with semi-coherent heterointerfaces exhibits superior interfacial toughness of 2.85 MPa⋅m1/2 relative to randomly oriented interfaces in Al2O3/SmAlO3 polycrystals. SmAlO3 grain boundaries (GBs) have the lowest toughness of 1.97 MPa⋅m1/2 among all the constituents, i.e. bulk and interfaces. The toughness of eutectic Al2O3-SmAlO3 interfaces is intermediate between polycrystalline Al2O3-Al2O3 GBs and SmAlO3-SmAlO3 GBs. Fracture toughness values of both polycrystalline and eutectic Al2O3-SmAlO3 samples obtained by mesoscopic indentation measurements are in the range of 4.2 MPa⋅m1/2to 4.7 MP⋅m1/2, which exceeds all constituent components. Much of the overall fracture toughness of the bulk samples derives from microstructural and geometric energy dissipation mechanisms.

Original languageEnglish (US)
Pages (from-to)3277-3282
Number of pages6
JournalJournal of the European Ceramic Society
Issue number10
StatePublished - Aug 2019


  • AlO-based eutectics
  • Finite element method
  • Interfacial properties
  • Microcantilever deflection

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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