Indentation fracture response of al–TiN Nanolaminates

William M. Mook, Rejin Raghavan, J. Kevin Baldwin, Damian Frey, Johann Michler, Nathan A. Mara, Amit Misra

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Indentation fracture experiments on aluminium-titanium nitride nanolaminates were conducted both inside and outside of a scanning electron microscope (SEM). Remarkably, indentation fracture toughness increases with increasing strength for bilayer thicknesses less than 10nm. In addition, slower strain rates favour formation of lateral cracking while increasing rates favour formation of radial cracks. SEM movies show that an increase in radial crack length does not occur during the unloading cycle; this is due to flow of aluminium into the cracks during unloading and is a form of self-healing which should be applicable to metal-ceramic nanolaminates in general.

Original languageEnglish (US)
Pages (from-to)102-108
Number of pages7
JournalMaterials Research Letters
Volume1
Issue number2
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Fracture Toughness
  • Indentation
  • Thin Film

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