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Los Alamos National LaboratoryCenter for Integrated Nanotechnologies
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DOE

2020 Highlights

A selection of CINT science highlights from staff and user research.

CINT Contacts  

  • Brad Boyce
  • In-Situ Characterization and Nanomechanics Thrust
  • Email
  • Katie Jungjohann
  • In-Situ Characterization and Nanomechanics Thrust
  • Email

Governing Mechanisms of Plastic Deformation Revealed with In-Situ TEM

Scientific Achievement

For the first time, scientists have measured true activation volume using in-situ TEM observations of plastic deformation in ultrafine-grained gold under tension.

Significance and Impact

This approach enables the nanoscale mechanisms responsible for time-dependent plasticity to be unambiguously correlated to the activation volume measurements.

Research Details

SEM images of the gold microspecimens used in the study.
  • A MEMS-based quantitative in-situ TEM technique allows accurate measurements of stress decrease during short relaxation segments, with 1-2 MPa precision.
  • The SEM images show the 100 nm-thick ultrafine -grained gold thin films used to test the technique.
  • TEM observations of grain boundary–dislocation interactions were made while measuring volume.
  • Concurrent measurements of stress as a function of time indicate a true activation volume that is comparable to ex-situ measurements.

Publication: Gupta S, Stangebye S, Jungjohann K, Boyce B, Zhu T, Kacher J, Pierron ON. In situ TEM measurement of activation volume in ultrafine grained gold. Nanoscale. 2020;12(13):7146-58. [DOI: 10.1039/d0nr01874k]

Funding: SG, SS, TZ, JK and OP gratefully acknowledge support by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) Materials Science and Engineering (MSE) Division under award #DE-SC0018960. BLB was also funded from the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) Materials Science and Engineering (MSE) Division. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. DOE’s National Nuclear Security Administration under contract DE-NA-0003525.