Measurement of elastic precursor decay in pre-heated aluminum films under ultra-fast laser generated shocks

Zuanetti, Bryan; McGrane, Shawn David; Bolme, Cynthia Anne; Prakash, Vikas

doi:10.1063/1.5027390

Title: Measurement of elastic precursor decay in pre-heated aluminum films under ultra-fast laser generated shocks

Journal Article · Fri May 18 00:00:00 EDT 2018 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.5027390· OSTI ID:1440498

^[1];

^[2];

^[2]; Prakash, Vikas ^[1]

Case Western Reserve Univ., Cleveland, OH (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, this article presents results from laser-driven shock compression experiments performed on pre-heated pure aluminum films at temperatures ranging from 23 to 400 °C. The samples were vapor deposited on the surface of a 500 μm thick sapphire substrate and mounted onto a custom holder with an integrated ring-heater to enable variable initial temperature conditions. A chirped pulse amplified laser was used to generate a pulse for both shocking the films and for probing the free surface velocity using Ultrafast Dynamic Ellipsometry. The particle velocity traces measured at the free surface clearly show elastic and plastic wave separation, which was used to estimate the decay of the elastic precursor amplitude over propagation distances ranging from 0.278 to 4.595 μm. Elastic precursors (which also correspond to dynamic material strength under uniaxial strain) of increasing amplitudes were observed with increasing initial sample temperatures for all propagation distances, which is consistent with expectations for aluminum in a deformation regime where phonon drag limits the mobility of dislocations. The experimental results show peak elastic amplitudes corresponding to axial stresses of over 7.5 GPa; estimates for plastic strain-rates in the samples are of the order 10⁹/s. The measured elastic amplitudes at the micron length scales are compared with those at the millimeter length-scales using a two-parameter model and used to correlate the rate sensitivity of the dynamic strength at strain-rates ranging from 10³ to 10⁹/s and elevated temperature conditions. The overall trend, as inferred from the experimental data, indicates that the temperature-strengthening effect decreases with increasing plastic strain-rates.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-06NA25396; NA0001989; NA0002919; 20170070DR

OSTI ID:: 1440498

Alternate ID(s):: OSTI ID: 1437714

Report Number(s):: LA-UR-18-21409; TRN: US1900757

Journal Information:: Journal of Applied Physics, Vol. 123, Issue 19; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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A benchtop shock physics laboratory: Ultrafast laser driven shock spectroscopy and interferometry methods Powell, M. S.; Bowlan, P. R.; Son, S. F. Review of Scientific Instruments, Vol. 90, Issue 6 https://doi.org/10.1063/1.5092244	journal	June 2019
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Effects of temperature on the flow stress of aluminum in shock waves and rarefaction waves Kanel, G. I.; Savinykh, A. S.; Garkushin, G. V. Journal of Applied Physics, Vol. 127, Issue 3 https://doi.org/10.1063/1.5130703	journal	January 2020

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