Strength effects in diamond under shock compression from 0.1 to 1 TPa

R. S. McWilliams, J. H. Eggert, D. G. Hicks, D. K. Bradley, P. M. Celliers, D. K. Spaulding, T. R. Boehly, G. W. Collins, R. Jeanloz

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Abstract

A two-wave shock structure-elastic precursor followed by an inelastic compression wave-is observed in single crystal and polycrystalline diamond laser shock compressed to peak stresses as high as 800 GPa. The Hugoniot elastic limits are measured to be 80 (+/-12), 81 (+/-6), and 60 (+/-3) GPa for the <100 >, <110 >, and <111 > orientations of single crystals with the directional dependence attributable to the relative increase in strength under confining stress. These values imply a single crystal yield strength approximately 1/3 of theoretical predictions. The measurements reveal clear deviations from an elastic-plastic response upon dynamic yielding with significant relaxation toward an isotropic stress state for shock stresses of at least 160 GPa. Previously reported signatures of melting at 700-800 GPa along the diamond Hugoniot may be related to the transition from a two-wave to a single-wave structure, supporting the interpretation that melting begins at lower stresses (similar to 600 GPa) with the appearance of an optically reflecting phase of carbon.

Original languageEnglish
Article number014111
Number of pages19
JournalPhysical review B: Condensed matter and materials physics
Volume81
Issue number1
DOIs
Publication statusPublished - Jan 2010

Keywords

  • SINGLE-CRYSTAL
  • THEORETICAL STRENGTH
  • DYNAMIC COMPRESSION
  • WAVE COMPRESSION
  • PHASE-TRANSITION
  • HIGH-PRESSURES
  • SILICON
  • LASER
  • ALUMINUM
  • INTERFEROMETER

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