EXAFS Measurements of Laser-Shocked V and Ti and Crystal Phase Transformation in Ti

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Extended X-Ray Absorption Fine Structure (EXAFS), using a laser-imploded target as a source, can yield the properties of laser-shocked metals on a nanosecond time scale. EXAFS measurements of vanadium shocked to {approx}0.4 Mbar yield the compression and temperature in good agreement with hydrodynamic simulations and shock-speed measurements. In laser-shocked titanium at the same pressure, the EXAFS modulation damping is much higher than warranted by the predicted temperature increase. This is shown to be due to the {alpha}-Ti to {omega}-Ti crystal-phase transformation, known to occur below {approx}0.1 Mbar for slower shock waves. The dynamics of material response to shock loading has ... continued below

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Yaakobi, B; Meyerhofer, D D; Boehly, T R; Rehr, J J; Remington, B A; Allen, P G et al. March 10, 2004.

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Extended X-Ray Absorption Fine Structure (EXAFS), using a laser-imploded target as a source, can yield the properties of laser-shocked metals on a nanosecond time scale. EXAFS measurements of vanadium shocked to {approx}0.4 Mbar yield the compression and temperature in good agreement with hydrodynamic simulations and shock-speed measurements. In laser-shocked titanium at the same pressure, the EXAFS modulation damping is much higher than warranted by the predicted temperature increase. This is shown to be due to the {alpha}-Ti to {omega}-Ti crystal-phase transformation, known to occur below {approx}0.1 Mbar for slower shock waves. The dynamics of material response to shock loading has been extensively studied in the past [1]. The goal of those studies has been to understand the shock-induced deformation and structural changes at the microscopic level [2]. Laser-generated shocks can be employed to broaden these studies to higher pressures ({approx}1 Mbar) and strain rates ({approx} 10{sup 7}-10{sup 8} s{sup -1}). Recently, laser-shocked materials have been studied with in-situ x-ray diffraction [3,4]. The goal of this work is to examine the use of in-situ EXAFS [5] as a complementary characterization of laser-shocked metals. EXAFS is the modulation in the x-ray absorption above the K edge (or L edge) due to the interference of the photoelectron waves with the waves reflected from neighboring atoms. The frequency of EXAFS modulations is related to the inter-particle distance, hence to the compression. The damping rate of the modulation can yield the lattice temperature, which is not readily available by other methods.

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PDF-file: 17 pages; size: 0.3 Mbytes

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  • Journal Name: Physical Review Letters, vol. 92, no. 9, March 5, 2004, pp. 095504; Journal Volume: 92; Journal Issue: 9

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  • Report No.: UCRL-JRNL-203138
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 936660
  • Archival Resource Key: ark:/67531/metadc900271

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  • March 10, 2004

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 28, 2016, 1:53 p.m.

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Yaakobi, B; Meyerhofer, D D; Boehly, T R; Rehr, J J; Remington, B A; Allen, P G et al. EXAFS Measurements of Laser-Shocked V and Ti and Crystal Phase Transformation in Ti, article, March 10, 2004; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc900271/: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.