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Faceted He-Filled “Pancakes” Confined within Nanoscale Metal Layers

  • Advanced Characterization and Testing of Irradiated Materials
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Abstract

Helium (He)-filled cavities in single-phase metals typically take on nearly equiaxed shapes, such as spherical bubbles or voids. However, in multiphase metal composites, the morphology of the constituent phases and the structure of the interfaces between them alter the shapes of such He-filled cavities. In this work, a He-implanted three-layer composite consisting of a 5-nm-thick Cu layer sandwiched between two V layers was reexamined. In addition to He-filled nanochannels, which have been reported in this material before, we discovered faceted He-filled “pancakes,” viz. high-aspect-ratio cavities spanning the thickness of the Cu layer and extending several tens of nanometers parallel to the Cu/V interfaces. We propose that such pancakes form nanochannels via a multistage coarsening process.

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Acknowledgements

The authors acknowledge the DOE Office of Science Graduate Student Research (SCGSR) program, which financially supported a 6-month grant to conduct this work at Los Alamos National Laboratory. This work was primarily supported by the National Science Foundation (NSF) through the DMREF Program under Grant Numbers 1533557 and 1623051. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the US Department of Energy (DOE) Office of Science by Los Alamos National Laboratory (Contract DE-AC52-06NA25396) and Sandia National Laboratories (Contract DE-NA-0003525). The authors acknowledge the financial support of the University of Michigan College of Engineering and NSF Grant DMR-0723032, and technical support from the Michigan Center for Materials Characterization.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA

    Benjamin K. Derby & Amit Misra

  2. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Jon Kevin Baldwin & Nan Li

  3. Department of Physics, University of Houston, Houston, TX, 77004, USA

    Di Chen

  4. Department of Materials Science and Engineering, Texas A&M University, College Station, Texas, 77843, USA

    Michael J. Demkowicz

  5. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Yongqiang Q. Wang

  6. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA

    Amit Misra

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  1. Benjamin K. Derby
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  2. Jon Kevin Baldwin
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Correspondence to Benjamin K. Derby.

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Derby, B.K., Baldwin, J.K., Chen, D. et al. Faceted He-Filled “Pancakes” Confined within Nanoscale Metal Layers. JOM 72, 145–149 (2020). https://doi.org/10.1007/s11837-019-03870-5

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  • DOI: https://doi.org/10.1007/s11837-019-03870-5

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