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Grain-size-independent plastic flow at ultrahigh pressures and strain rates.
Park, H-S; Rudd, R E; Cavallo, R M; Barton, N R; Arsenlis, A; Belof, J L; Blobaum, K J M; El-dasher, B S; Florando, J N; Huntington, C M; Maddox, B R; May, M J; Plechaty, C; Prisbrey, S T; Remington, B A; Wallace, R J; Wehrenberg, C E; Wilson, M J; Comley, A J; Giraldez, E; Nikroo, A; Farrell, M; Randall, G; Gray, G T.
Afiliação
  • Park HS; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Rudd RE; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Cavallo RM; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Barton NR; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Arsenlis A; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Belof JL; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Blobaum KJ; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • El-dasher BS; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Florando JN; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Huntington CM; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Maddox BR; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • May MJ; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Plechaty C; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Prisbrey ST; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Remington BA; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Wallace RJ; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Wehrenberg CE; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Wilson MJ; Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
  • Comley AJ; Atomic Weapons Establishment, Aldermaston, Reading RG7 4PR, United Kingdom.
  • Giraldez E; General Atomics, 3550 General Atomics Court, San Diego, California 92121, USA.
  • Nikroo A; General Atomics, 3550 General Atomics Court, San Diego, California 92121, USA.
  • Farrell M; General Atomics, 3550 General Atomics Court, San Diego, California 92121, USA.
  • Randall G; General Atomics, 3550 General Atomics Court, San Diego, California 92121, USA.
  • Gray GT; Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA.
Phys Rev Lett ; 114(6): 065502, 2015 Feb 13.
Article em En | MEDLINE | ID: mdl-25723227
ABSTRACT
A basic tenet of material science is that the flow stress of a metal increases as its grain size decreases, an effect described by the Hall-Petch relation. This relation is used extensively in material design to optimize the hardness, durability, survivability, and ductility of structural metals. This Letter reports experimental results in a new regime of high pressures and strain rates that challenge this basic tenet of mechanical metallurgy. We report measurements of the plastic flow of the model body-centered-cubic metal tantalum made under conditions of high pressure (>100 GPa) and strain rate (∼10(7) s(-1)) achieved by using the Omega laser. Under these unique plastic deformation ("flow") conditions, the effect of grain size is found to be negligible for grain sizes >0.25 µm sizes. A multiscale model of the plastic flow suggests that pressure and strain rate hardening dominate over the grain-size effects. Theoretical estimates, based on grain compatibility and geometrically necessary dislocations, corroborate this conclusion.
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Tantálio / Modelos Teóricos Idioma: En Revista: Phys Rev Lett Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Estados Unidos
Buscar no Google
Imprimir
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PubMed Links

Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Tantálio / Modelos Teóricos Idioma: En Revista: Phys Rev Lett Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Estados Unidos