Three-stage character of strain hardening of α-Ti in tension conditions
| Autor: | Jean-Sébastien Lecomte, Amandine Roth, Thiebaud Richeton, T.A. Lebedkina, Kékéli Eva K. Amouzou, Lebyodkin |
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| Přispěvatelé: | Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), B. Mishra, M. Ionescu, T. Chandra |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering 02 engineering and technology Work hardening [CHIM.MATE]Chemical Sciences/Material chemistry Plasticity Strain hardening exponent 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Crystallography Mechanics of Materials 0103 physical sciences General Materials Science Composite material Deformation (engineering) Dislocation 0210 nano-technology Crystal twinning Anisotropy Electron backscatter diffraction |
| Zdroj: | Materials Science Forum : THERMEC 2013 THERMEC 2013: International Conference on Processing & Manufacturing of Advanced Materials THERMEC 2013: International Conference on Processing & Manufacturing of Advanced Materials, Dec 2013, Las Vegas (NV), United States. pp.568-573 HAL |
| Popis: | International audience; The plasticity of hexagonal materials is strongly anisotropic and involves different microscopic mechanisms such as mechanical twinning and dislocation glide. Twins are often considered to be responsible for a particular three-stage shape of compression curves, unusual for polycrystals with cubic structure. However, the role of twins remains a matter of debate and it is not clear if the same features appear in other testing conditions. We performed tensile tests on commercially-pure Ti samples cut along the rolling and the transverse direction, which yielded several unexpected results. In particular, the work hardening rate was found to be lower in the latter case, although the EBSD measurements revealed for them a larger volume fraction of twins. Also, the two kinds of specimens showed an opposite sign for the strain-rate effect on the proneness to the three-stage shape of the deformation curves. As a first approach, these observations are compared to the results derived from a simple Kocks-Mecking model. The possible role of twinning and dislocation glide on the anisotropy of mechanical behavior of titanium is then discussed. |
| Databáze: | OpenAIRE |
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