期刊
SCIENCE
卷 342, 期 6155, 页码 220-223出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1239566
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资金
- LCLS
- UK Atomic Weapons Establishment
- UK Engineering and Physical Sciences Research Council [EP/J017256/1]
- EPSRC [EP/J017256/1] Funding Source: UKRI
- Division Of Earth Sciences
- Directorate For Geosciences [1141929] Funding Source: National Science Foundation
- Engineering and Physical Sciences Research Council [EP/J017256/1] Funding Source: researchfish
The ultrafast evolution of microstructure is key to understanding high-pressure and strain-rate phenomena. However, the visualization of lattice dynamics at scales commensurate with those of atomistic simulations has been challenging. Here, we report femtosecond x-ray diffraction measurements unveiling the response of copper to laser shock-compression at peak normal elastic stresses of similar to 73 gigapascals (GPa) and strain rates of 10(9) per second. We capture the evolution of the lattice from a one-dimensional (1D) elastic to a 3D plastically relaxed state within a few tens of picoseconds, after reaching shear stresses of 18 GPa. Our in situ high-precision measurement of material strength at spatial (<1 micrometer) and temporal (<50 picoseconds) scales provides a direct comparison with multimillion-atom molecular dynamics simulations.
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