Dislocation avalanches, strain bursts, and the problem of plastic forming at the micrometer scale (Articolo in rivista)

Type
Label
  • Dislocation avalanches, strain bursts, and the problem of plastic forming at the micrometer scale (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Csikor, FF; Motz, C; Weygand, D; Zaiser, M; Zapperi, S (2007)
    Dislocation avalanches, strain bursts, and the problem of plastic forming at the micrometer scale
    in Science (N. Y., N.Y.)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Csikor, FF; Motz, C; Weygand, D; Zaiser, M; Zapperi, S (literal)
Pagina inizio
  • 251 (literal)
Pagina fine
  • 254 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 318 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Roma La Sapienza, Dipartimento Fis, CNR, Ist Nazl Fis Mat, I-00185 Rome, Italy; Lorand Eotvos Univ, Dept Mat Phys, H-1518 Budapest, Hungary; Univ Edinburgh, Ctr Mat Sci & Engn, Edinburgh EH9 3JL, Midlothian, Scotland; Univ Karlsruhe, Inst Zuverlassigkeit Bauteilen & Syst, D-76131 Karlsruhe, Germany; Inst Sci Interchange Fdn, I-10133 Turin, Italy (literal)
Titolo
  • Dislocation avalanches, strain bursts, and the problem of plastic forming at the micrometer scale (literal)
Abstract
  • Under stress, many crystalline materials exhibit irreversible plastic deformation caused by the motion of lattice dislocations. In plastically deformed microcrystals, internal dislocation avalanches lead to jumps in the stress-strain curves (strain bursts), whereas in macroscopic samples plasticity appears as a smooth process. By combining three-dimensional simulations of the dynamics of interacting dislocations with statistical analysis of the corresponding deformation behavior, we determined the distribution of strain changes during dislocation avalanches and established its dependence on microcrystal size. Our results suggest that for sample dimensions on the micrometer and submicrometer scale, large strain fluctuations may make it difficult to control the resulting shape in a plastic-forming process. (literal)
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