Journal
SCIENCE ADVANCES
Volume 7, Issue 29, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abe8311
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Funding
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- Danish Agency for Science and Higher Education [8144-00002B]
- European Research Council The Physics of Metal Plasticity [ERC-2019-ADV-885022]
- Test Services LLC [DE-NA0003624]
- U.S. Department of Energy
- Site-Directed Research and Development Program, U.S. Department of Energy, National Nuclear Security Administration
- DOE Public Access Plan
- U.S. Department of Energy [DOE/NV/03624-0762]
- Lawrence Fellowship
- U.S. government
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This study utilized time-resolved dark-field x-ray microscopy to directly observe the movement and interactions of dislocations in bulk aluminum. Real-time movies revealed the thermally activated motion and interactions of dislocations, as well as the structural instability near the melting temperature.
Connecting a bulk material's microscopic defects to its macroscopic properties is an age-old problem in materials science. Long-range interactions between dislocations (line defects) are known to play a key role in how materials deform or melt, but we lack the tools to connect these dynamics to the macroscopic properties. We introduce time-resolved dark-field x-ray microscopy to directly visualize how dislocations move and interact over hundreds of micrometers deep inside bulk aluminum. With real-time movies, we reveal the thermally activated motion and interactions of dislocations that comprise a boundary and show how weakened binding forces destabilize the structure at 99% of the melting temperature. Connecting dynamics of the microstructure to its stability, we provide important opportunities to guide and validate multiscale models that are yet untested.
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