Strain anisotropy and shear strength of shock compressed tantalum from in-situ Laue diffraction

18th APS-SCCM; 24th AIRAPT

Wehrenberg, C.^1 ; Comley, A.J.^2 ; Rudd, R.E.^1 ; Terry, M.^1 ; Hawreliak, J.^1 ; Maddox, B.R.^1 ; Prisbrey, S.T.^1 ; Park, H.-S.^1 ; Remington, B.A.^1

Lawrence Livermore National Laboratory, Livermore

CA

94551, United States^1

Atomic Weapons Establishment, Aldermaston, Reading

RG7 4PR, United Kingdom^2

关键词: Bremsstrahlung radiation;    Diffraction spots;    Dynamic yield strengths;    Image plate detectors;    Laser driven shocks;    Laue diffraction;    Strain anisotropies;    X-ray sources;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/11/112064/pdf
DOI  :  10.1088/1742-6596/500/11/112064

来源: IOP

【 摘 要 】

Laser driven shock experiments were performed at the Omega facility to study the dynamic yield strength of ∼5 μm thick single crystal tantalum using in-situ Laue diffraction. Tantalum samples were shocked along the [001] direction to peak stresses up to 50 GPa and probed using a 150 ps pulse of bremsstrahlung radiation from an imploding CH capsule x-ray source timed for when the shock was halfway through the sample. The capsule implosion was monitored by a combination of pinhole cameras and DANTE x-ray diode scopes. Diffraction spots for both the undriven and driven regions of the sample were recorded simultaneously on image plate detectors. The strain state of the material was found by combining the strain anisotropy found from the driven diffraction pattern and with simultaneous VISAR measurements.