Molecular Dynamics Modelling of Laser-Pulse Compression of a Ta single crystal with dislocations

POSTER

Abstract

The nanoindentation of a defect-free Ta [001] single crystal is studied by Molecular Dynamics simulations. The potential by Li et al [PRB 67 (2003)], an EFS potential [J Phys Condens Matter 18(2006)], and a recent EAM potential by Ravelo et al [AIP Conf Proc 1426 (2012)] are tested and their results analyzed in terms of dislocation slip planes. Dislocations emitted from the indented zone interact forming prismatic loops. The Ta dislocated structure is then subjected to shock compression induced by a piston hitting the sample at various speeds. The shock-induced dislocation generation and motion mechanisms are studied in order to compare to on-going experiments.

*This research was funded by ANPCyT PRH, PICT2008-1325, PICT2009-0092, SecTyP UNCuyo 06/M035 and UC Research Lab grants

Authors

  • Carlos Ruestes

    • Instituto de Ciencias Basicas, UNCuyo, Mendoza 5500, Argentina
    • Instituto de Ciencias Basicas, Universidad Nacional de Cuyo, Mendoza, Argentina
    • ICB-UNCUYO \& University of California, San Diego, La Jolla, CA 92093, USA
    • Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093, USA

  • Tane P. Remington

    • University of California, San Diego
    • University of California, San Diego, La Jolla, CA 92093, USA

  • Eduardo Bringa

    • Instituto de Ciencias Basicas \& CONICET, UNCuyo, Mendoza 5500, Argentina
    • CONICET and Instituto de Ciencias Basicas, Universidad Nacional de Cuyo, Mendoza, Argentina
    • Universidad Nacional de Cuyo, Argentina
    • ICB-UNCUYO \& CONICET, Mendoza 5500, Argentina
    • CONICET and Instituto de Ciencias Basicas, Universidad Nacional de Cuyo, Mendoza, 5500 Argentina
    • Consejo Nacional de Investigaciones Cientificas y Tecnicas, CABA, C1033AAJ Argentina
    • Consejo Nacional de Investigaciones Cientificas y Tecnicas. CABA. C1033AAJ Argentina

  • Marc Meyers

    • University of California, San Diego, La Jolla, CA 92093, USA
    • University of California, San Diego
    • University of California San Diego

  • Bruce Remington

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
    • LLNL