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Ruestes CJ, Bringa EM, Rudd RE, et al. Probing the character of ultra-fast dislocations. Sci Rep. 2015;5:16892doi: 10.1038/srep16892.
Ruestes, C. J., Bringa, E. M., Rudd, R. E., Remington, B. A., Remington, T. P., & Meyers, M. A. (2015). Probing the character of ultra-fast dislocations. Scientific reports, 516892. https://doi.org/10.1038/srep16892
Ruestes, C J, et al. "Probing the character of ultra-fast dislocations." Scientific reports vol. 5 (2015): 16892. doi: https://doi.org/10.1038/srep16892
Ruestes CJ, Bringa EM, Rudd RE, Remington BA, Remington TP, Meyers MA. Probing the character of ultra-fast dislocations. Sci Rep. 2015 Nov 23;5:16892. doi: 10.1038/srep16892. PMID: 26592764; PMCID: PMC4655350.
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Sci Rep. 2015 Nov 23;5:16892. doi: 10.1038/srep16892.

Probing the character of ultra-fast dislocations.

Scientific reports

C J Ruestes, E M Bringa, R E Rudd, B A Remington, T P Remington, M A Meyers

Affiliations

  1. Facultad de Ciencias Exactas y Naturales, Univ. Nac. de Cuyo, Mendoza 5500, Argentina.
  2. Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
  3. University of California, San Diego, La Jolla, CA 92093, USA.

PMID: 26592764 PMCID: PMC4655350 DOI: 10.1038/srep16892

Abstract

Plasticity is often controlled by dislocation motion, which was first measured for low pressure, low strain rate conditions decades ago. However, many applications require knowledge of dislocation motion at high stress conditions where the data are sparse, and come from indirect measurements dominated by the effect of dislocation density rather than velocity. Here we make predictions based on atomistic simulations that form the basis for a new approach to measure dislocation velocities directly at extreme conditions using three steps: create prismatic dislocation loops in a near-surface region using nanoindentation, drive the dislocations with a shockwave, and use electron microscopy to determine how far the dislocations moved and thus their velocity at extreme stress and strain rate conditions. We report on atomistic simulations of tantalum that make detailed predictions of dislocation flow, and find that the approach is feasible and can uncover an exciting range of phenomena, such as transonic dislocations and a novel form of loop stretching. The simulated configuration enables a new class of experiments to probe average dislocation velocity at very high applied shear stress.

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