Hardening due to interfacial he bubbles in nanolayered composites

Nan Li, Michael Demkowicz, Nathan Mara, Yongqiang Wang, Amit Misra

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


A series of helium (He) implantations with varying energies and doses were used to introduce bubbles into interfaces in Cu/Mo, Cu/V and Cu/Nb nanolayered composites. Micro-pillar compression testing revealed that the interfacial He bubbles give rise to modest hardening as compared to those in grain interiors. The flow stress enhancement is proportional to the strength of the un-implanted sample. We discuss the influence of the structure of the interfacial dislocation network, the shear resistance of the interfaces, and atomic-level interface steps on hardening. Interfaces with higher density of misfit dislocation intersections and lower shear resistance tend to provide greater hardening.

Original languageEnglish (US)
Pages (from-to)75-82
Number of pages8
JournalMaterials Research Letters
Issue number2
StatePublished - Dec 15 2015

Bibliographical note

Publisher Copyright:
© 2015 The Author(s). Published by Taylor & Francis.


  • Dislocation slip transmission
  • Interface shear resistance
  • Interfacial he bubbles


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