Ultrafast visualization of incipient plasticity in dynamically compressed matter
- SLAC National Accelerator Lab., Menlo Park, CA (United States); SLAC National Accelerator Laboratory
- Southwest Jiaotong Univ., Chengdu, Sichuan (China)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- European XFEL GmbH Schenefeld (Germany)
Plasticity is ubiquitous and plays a critical role in material deformation and damage; it inherently involves the atomistic length scale and picosecond time scale. A fundamental understanding of the elastic-plastic deformation transition, in particular, incipient plasticity, has been a grand challenge in high-pressure and high-strain-rate environments, impeded largely by experimental limitations on spatial and temporal resolution. Here, we report femtosecond MeV electron diffraction measurements visualizing the three-dimensional (3D) response of single-crystal aluminum to the ultrafast laser-induced compression. We capture lattice transitioning from a purely elastic to a plastically relaxed state within 5 ps, after reaching an elastic limit of ~25 GPa. Our results allow the direct determination of dislocation nucleation and transport that constitute the underlying defect kinetics of incipient plasticity. Large-scale molecular dynamics simulations show good agreement with the experiment and provide an atomic-level description of the dislocation-mediated plasticity.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Grant/Contract Number:
- 89233218CNA000001; AC02-76SF00515
- OSTI ID:
- 1843036
- Report Number(s):
- LA-UR-20-25942
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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