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

Abstract

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 scalesmore » 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.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [1]
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  1. Case Western Reserve Univ., Cleveland, OH (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1440498
Alternate Identifier(s):
OSTI ID: 1437714
Report Number(s):
LA-UR-18-21409
Journal ID: ISSN 0021-8979; TRN: US1900757
Grant/Contract Number:  
AC52-06NA25396; NA0001989; NA0002919; 20170070DR
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 19; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high strain-rates; pure polycrystalline aluminum; elevated temperatures; phonon-Drag; Hugoniot elastic limit; FCC Metals; Laser-driven shock; Chirped Laser Pulse

Citation Formats

Zuanetti, Bryan, McGrane, Shawn David, Bolme, Cynthia Anne, and Prakash, Vikas. Measurement of elastic precursor decay in pre-heated aluminum films under ultra-fast laser generated shocks. United States: N. p., 2018. Web. doi:10.1063/1.5027390.
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Zuanetti, Bryan, McGrane, Shawn David, Bolme, Cynthia Anne, & Prakash, Vikas. Measurement of elastic precursor decay in pre-heated aluminum films under ultra-fast laser generated shocks. United States. https://doi.org/10.1063/1.5027390
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Zuanetti, Bryan, McGrane, Shawn David, Bolme, Cynthia Anne, and Prakash, Vikas. Fri . "Measurement of elastic precursor decay in pre-heated aluminum films under ultra-fast laser generated shocks". United States. https://doi.org/10.1063/1.5027390. https://www.osti.gov/servlets/purl/1440498.
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@article{osti_1440498,
title = {Measurement of elastic precursor decay in pre-heated aluminum films under ultra-fast laser generated shocks},
author = {Zuanetti, Bryan and McGrane, Shawn David and Bolme, Cynthia Anne and Prakash, Vikas},
abstractNote = {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.},
doi = {10.1063/1.5027390},
journal = {Journal of Applied Physics},
number = 19,
volume = 123,
place = {United States},
year = {Fri May 18 00:00:00 EDT 2018},
month = {Fri May 18 00:00:00 EDT 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5027390
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Cited by: 29 works
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Figures / Tables:

Figure 1 Figure 1: Selection of laser drive energy. Measured free-surface particle velocity of 2 $μ$m thick aluminum films is driven by laser energies ranging from 0.07 to 0.3 mJ. Elastic and Plastic wave separation was well-resolved for the laser energies ranging from 0.07 to 0.2 mJ, and is shown to be nearlymore » over-driven at 0.3 mJ.« less
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    Works referencing / citing this record:

    A benchtop shock physics laboratory: Ultrafast laser driven shock spectroscopy and interferometry methods
    journal, June 2019

    • Powell, M. S.; Bowlan, P. R.; Son, S. F.
    • Review of Scientific Instruments, Vol. 90, Issue 6
    • DOI: 10.1063/1.5092244

    Stepwise shock compression of aluminum at room and elevated temperatures
    journal, August 2019

    • Kanel, G. I.; Savinykh, A. S.; Garkushin, G. V.
    • Journal of Applied Physics, Vol. 126, Issue 7
    • DOI: 10.1063/1.5099214

    Effects of temperature on the flow stress of aluminum in shock waves and rarefaction waves
    journal, January 2020

    • Kanel, G. I.; Savinykh, A. S.; Garkushin, G. V.
    • Journal of Applied Physics, Vol. 127, Issue 3
    • DOI: 10.1063/1.5130703
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      Figures / Tables found in this record:

      Figure 1 (p. 10)figure
      Figure 2 (p. 11)figure
      Figure 3 (p. 14)figure
      Figure 4 (p. 16)figure
      Figure 5 (p. 17)figure
      Figure 6 (p. 19)figure
      Figure 7 (p. 20)figure
      Figure 8 (p. 21)figure
      Table 1 (p. 21)table
      Table 2 (p. 22)table
      Figure 9 (p. 23)figure
      Figure 10 (p. 24)figure
      Table 3 (p. 25)table
      Figure 11 (p. 26)figure
      Figure 12 (p. 29)figure
      Figure 13 (p. 31)figure
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