Grain size effects on dislocation and twinning mediated plasticity in magnesium
| Autor: | Jaafar A. El-Awady, Sylvie Aubry, Athanasios Arsenlis, Haidong Fan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Mathematics::General Mathematics chemistry.chemical_element 02 engineering and technology Slip (materials science) Plasticity 01 natural sciences Condensed Matter::Materials Science Condensed Matter::Superconductivity 0103 physical sciences General Materials Science 010302 applied physics Dislocation creep Condensed matter physics Magnesium Mechanical Engineering Metallurgy Metals and Alloys 021001 nanoscience & nanotechnology Condensed Matter Physics Grain size chemistry Mechanics of Materials Peierls stress Dislocation 0210 nano-technology Crystal twinning |
| Zdroj: | Scripta Materialia. 112:50-53 |
| ISSN: | 1359-6462 |
| Popis: | Grain size effects on the competition between dislocation slip and 10 1 ¯ 2 -twinning in magnesium are investigated using discrete dislocation dynamics simulations. These simulations account for dislocation–twin boundary interactions and twin boundary migration through the glide of twinning dislocations. It is shown that twinning deformation exhibits a strong grain size effect; while dislocation mediated slip in untwinned polycrystals displays a weak one. This leads to a critical grain size at 2.7 μm, above which twinning dominates, and below which dislocation slip dominates. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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