Helium Implantation Effects on the Compressive Response of Cu Nanopillars

Authors

  • Qiang Guo,

    1. Department of Materials Science and Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
    2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China
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  • Peri Landau,

    1. Department of Materials Science and Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
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  • Peter Hosemann,

    1. Department of Nuclear Engineering, University of California at Berkeley, Berkeley, CA 94720, USA
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  • Yongqiang Wang,

    1. Ion Beam Materials Laboratory, Los Alamos National Laboratories, Los Alamos, NM 87545, USA
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  • Julia R. Greer

    Corresponding author
    1. Department of Materials Science and Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
    2. The Kavli Nanoscience Institute, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
    • Department of Materials Science and Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.
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Abstract

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A fabrication methodology for 120 nm-diameter, <111>-oriented single crystalline Cu nanopillars which are uniformly implanted with helium is described. Uniaxial compression experiments reveal that their yield strength is 30% higher than that of their unimplanted counterparts. This study sheds light on the fundamental understanding of the deformation mechanism of irradiated metallic nanocrystals, and has important implications for the interplay between irradiation-induced defects and the external sample dimensions in the nanoscale.

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