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Nanocrystalline tantalum (grain size ∼70nm) prepared by severe plastic deformation (high-pressure torsion) from monocrystalline [100] stock was subjected to shock compression generated by high-energy laser (∼350–850J), creating pressure pulses with initial duration of ∼3ns and amplitudes of up to ∼145GPa. The laser beam, with a spot radius of ∼1mm, created a crater of significant depth (∼135μm). Transmission...
Monocrystalline tantalum with orientations [100] and [111] was subjected to laser-driven compression at energies of 350–684J, generating shock amplitudes varying from 10 to 110GPa. A stagnating reservoir driven by a laser beam with a spot radius of ∼800μm created a crater of significant depth (∼80 to ∼200μm) on the drive side of the Ta sample. The defects generated by the laser pulse were characterized...
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