Micromechanical and in situ shear testing of Al-SiC nanolaminate composites in a transmission electron microscope (TEM)

C. Mayer, N. Li, N. Mara, Nikhilesh Chawla

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Nanolaminate composites show promise as high strength and toughness materials. However, due to the limited volume of these materials, micron scale mechanical testing methods must be used to determine the properties of these films. To this end, a novel approach combining a double notch shear testing geometry and compression with a flat punch in a nanoindenter was developed to determine the mechanical properties of these films under shear loading. To further elucidate the failure mechanisms under shear loading, in situ TEM experiments were performed using a double notch geometry cut into the TEM foil. Aluminum layer thicknesses of 50. nm and 100. nm were used to show the effect of constraint on the deformation. Higher shear strength was observed in the 50. nm sample (690±54. MPa) compared to the 100. nm sample (423±28.7. MPa). Additionally, failure occurred close to the Al-SiC interface in the 50. nm sample as opposed to failure within the Al layer in the 100. nm sample.

Original languageEnglish (US)
Pages (from-to)229-235
Number of pages7
JournalMaterials Science and Engineering A
Volume621
DOIs
StatePublished - Jan 5 2015

Keywords

  • Composites
  • Focused ion beam (FIB)
  • Interface
  • Nanostructured materials
  • Shear testing
  • Transmission electron microscope (TEM)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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