Development of shock-dynamics study with synchrotron-based time-resolved X-ray diffraction using an Nd:glass laser...

Area of Science:

• Materials Science
• Condensed Matter Physics
• High-Energy Physics

Background:

• Understanding material behavior under extreme conditions like shock compression is crucial for various scientific and engineering applications.
• Previous methods lacked the temporal and structural resolution to capture dynamic responses on nanosecond timescales.

Purpose of the Study:

• To investigate the shock-induced deformation dynamics of polycrystalline aluminum at the crystal structure level.
• To establish and utilize a novel experimental system combining high-power lasers and synchrotron X-rays for time-resolved studies.

Main Methods:

• Utilized a high-power Nd:glass laser system (16 J, 12 ns pulse) to induce shock compression in polycrystalline aluminum.
• Employed synchrotron-based time-resolved X-ray diffraction (XRD) at the NW14A beamline for in-situ structural analysis.
• Achieved shock pressures up to ~17 GPa with strain rates exceeding 4.6 × 10^7 s⁻¹.

Main Results:

• Observed plastic deformation leading to crystallite fragmentation in aluminum under shock loading.
• Found that the preferred crystallographic orientation remained largely unchanged during shock compression and release.
• Demonstrated the capability of the new system to capture nanosecond-scale dynamic material responses.

Conclusions:

• The newly established time-resolved XRD system provides critical insights into dynamic compression and release behaviors.
• Laser-induced shock experiments combined with time-resolved XRD are effective for studying materials under extreme strain rates.
• The findings contribute to a deeper understanding of shock wave physics and material deformation mechanisms.