Journal
MATERIALS RESEARCH LETTERS
Volume 4, Issue 2, Pages 75-82Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2015.1110730
Keywords
Interfacial He bubbles; dislocation slip transmission; interface shear resistance
Categories
Funding
- Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [2008LANL1026]
- Los Alamos National Laboratory Directed Research and Development project [20150567ER]
- U.S. Department of Energy (DOE) Office of Science [DE-AC52-06NA25396]
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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.
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