Plastic anisotropy and dislocation trajectory in BCC metals
| Autor: | Emmanuel Clouet, David Rodney, Lisa Ventelon, Lucile Dezerald, Francois Willaime |
|---|---|
| Přispěvatelé: | Service de recherches de métallurgie physique (SRMP), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), ANR-11-IDEX-0007,Avenir L.S.E.,PROJET AVENIR LYON SAINT-ETIENNE(2011), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Science
General Physics and Astronomy 02 engineering and technology Slip (materials science) Plasticity 01 natural sciences General Biochemistry Genetics and Molecular Biology Article [SPI]Engineering Sciences [physics] Condensed Matter::Materials Science Glide plane 0103 physical sciences [CHIM]Chemical Sciences Anisotropy Mathematics::Representation Theory 010302 applied physics Physics [PHYS]Physics [physics] Multidisciplinary Condensed matter physics General Chemistry 021001 nanoscience & nanotechnology Critical resolved shear stress Peierls stress Dislocation 0210 nano-technology Slip line field |
| Zdroj: | Nature Communications, Vol 7, Iss 1, Pp 1-7 (2016) Nature Communications Nature Communications, Nature Publishing Group, 2016, 7, pp.11695. ⟨10.1038/ncomms11695⟩ Nature Communications, 2016, 7, pp.11695. ⟨10.1038/ncomms11695⟩ |
| ISSN: | 2041-1723 |
| Popis: | Plasticity in body-centred cubic (BCC) metals at low temperatures is atypical, marked in particular by an anisotropic elastic limit in clear violation of the famous Schmid law applicable to most other metals. This effect is known to originate from the behaviour of the screw dislocations; however, the underlying physics has so far remained insufficiently understood to predict plastic anisotropy without adjustable parameters. Here we show that deviations from the Schmid law can be quantified from the deviations of the screw dislocation trajectory away from a straight path between equilibrium configurations, a consequence of the asymmetrical and metal-dependent potential energy landscape of the dislocation. We propose a modified parameter-free Schmid law, based on a projection of the applied stress on the curved trajectory, which compares well with experimental variations and first-principles calculations of the dislocation Peierls stress as a function of crystal orientation. Low-temperature plasticity in BCC metals is atypical, marked by an anisotropic elastic limit in violation of the Schmid law. Here, the authors show that these deviations can be quantified from subatomic deviations of the screw dislocation trajectory away from its average glide plane. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|