The influence of irradiation-induced damage on the interfacial shear strength of Cu-Nb interfaces was characterized via compression of nanolaminate pillars performed in situ in a transmission electron microscope. Chemical mixing and interfacial roughening during MeV Kr ion irradiation leads to increased interfacial shear strength by as much as 60%, from 0.6 GPa for the as-deposited material to 0.95 GPa for samples irradiated at liquid nitrogen temperature. The increase in interfacial shear strength was most pronounced at low temperatures (~-196 °C), but it is still significant at ~300 °C. This observation was correlated with increased chemical mixing at lower temperatures, as determined from compositional profiles characterized by energy-dispersive spectroscopy.

Original languageEnglish (US)
Pages (from-to)29-32
Number of pages4
JournalScripta Materialia
Issue number1
StatePublished - 2014


  • In situ transmission electron microscopy
  • Ion beam mixing
  • Irradiation
  • Shear strength

ASJC Scopus subject areas

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


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