Influence of stacking fault energy and dislocation character on slip transfer at coherent twin boundaries studied by micropillar compression
| Autor: | Jan Philipp Liebig, Benoit Merle, Sebastian Krauß, Mathias Göken |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Polymers and Plastics Condensed matter physics Metals and Alloys 02 engineering and technology Slip (materials science) 021001 nanoscience & nanotechnology 01 natural sciences Focused ion beam Electronic Optical and Magnetic Materials Stacking-fault energy 0103 physical sciences Ceramics and Composites Hardening (metallurgy) Crystallite Dislocation 0210 nano-technology Crystal twinning Stacking fault |
| Zdroj: | Acta Materialia. 154:261-272 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2018.05.037 |
| Popis: | Copper and α-brass micropillars containing a single coherent twin boundary of controlled orientation were compressed to systematically investigate dislocation-twin boundary interactions as a function of the dislocation type and generalized stacking fault energies. For this purpose, bicrystalline micropillars in [112], [110] and [259] orientations were prepared from polycrystalline samples using focused ion beam milling in combination with custom 3D-printed sample holders. Consistent with previous findings, a vertical twin boundary neither resulted in the storage of dislocations at the interface nor in an increase of the sample strength when compressed in the [112] direction. However, the interface proved to be a strong obstacle for the non-screw dislocations promoted by the [259] orientation. In this case, dislocation storage – evidenced by large pile-ups – lead to a strong hardening of the specimens. The strengthening contribution of the interface was further affected by the stacking fault energy of the material. While this could be related to the different permeability of the interface, it is more likely the result of a change in cross-slip frequency within the sample volume. |
| Databáze: | OpenAIRE |
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