Nanoindentation characterization of deformation and failure of aluminum oxynitride

J. J. Guo, K. Wang, T. Fujita, J. W. McCauley, J. P. Singh, M. W. Chen

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

A systematic study of the mechanical deformation and failure of transparent ceramic aluminum oxynitride (AlON) has been conducted using a depth-sensitive nanoindentation technique combined with transmission electron microscopy (TEM) and Raman spectroscopy. Although discrete displacement bursts appear in the load-depth profiles at high applied forces, a detectable high-pressure phase transition has not been found by means of micro-Raman spectroscopy and TEM. Instead, a high density of dissociated 〈1 1 0〉 dislocations can be observed underneath the nanoindenters, suggesting that extensive plastic deformation takes place in the brittle ceramic at high contact pressures. Moreover, nanoindentation-induced micro-cracks oriented along well-defined crystallographic planes can also be observed, consistent with the low fracture toughness of AlON evaluated by an indentation method using Laugier's equation.

Original languageEnglish
Pages (from-to)1671-1679
Number of pages9
JournalActa Materialia
Volume59
Issue number4
DOIs
Publication statusPublished - 2011 Feb

Keywords

  • Fracture toughness
  • Nanoindentation
  • Plasticity
  • Transmission electron microscopy

ASJC Scopus subject areas

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

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    Guo, J. J., Wang, K., Fujita, T., McCauley, J. W., Singh, J. P., & Chen, M. W. (2011). Nanoindentation characterization of deformation and failure of aluminum oxynitride. Acta Materialia, 59(4), 1671-1679. https://doi.org/10.1016/j.actamat.2010.11.034