Plasticity mechanisms in nanovoided b.c.c. metals under high strain rate compression

ORAL

Abstract

Atomistic-scale simulations provide unique insights to plasticity mechanisms arising under extreme conditions where its relative nanoscopic length and time scales render experiments almost impossible. Our studies explore the mechanical response and plasticity effects under uniaxial high strain rate compression for a Ta single crystal with a collection of spherical nanovoids, with a radius of 3-4 nm, providing an initial porosity of 5{\%}-20{\%}. We examine strain rate effects, from 10$^{7}$/s to 10$^{10}$/s, in the dislocation density and dislocation-induced heating. The resulting dislocation densities are in good agreement with experimental results for shock-recovered samples.

*This research was funded by the ANPCyT project PICT2008-1325, PICT2009-0092, PRH and 06/M035 from SecTyP-U.N.Cuyo and UC Research Labs

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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

  • 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

  • Alexander Stukowski

    • Technische Universitat Darmstadt, Germany

  • Joaquin F. Rodr\'Iguez Nieva

    • Massachusetts Institute of Technology, MA 02139, USA

  • Graciela Bertolino

    • CONICET - Centro Atomico Bariloche, Bariloche 8400, Argentina

  • Yizhe Tang

    • Johns Hopkins University, Baltimore, MD 21212, USA

  • Marc Meyers

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