Influence of stacking fault energy and dislocation character on slip transfer at coherent twin boundaries studied by micropillar compression

Journal article


Publication Details

Author(s): Liebig JP, Krauß S, Göken M, Merle B
Journal: Acta Materialia
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication year: 2018
Volume: 154
Pages range: 261-272
ISSN: 1359-6454


Abstract

Copper and alpha-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. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.


FAU Authors / FAU Editors

Göken, Mathias Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Krauß, Sebastian
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Liebig, Jan Philipp
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Merle, Benoit PD Dr. habil.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)


Additional Organisation
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


How to cite

APA:
Liebig, J.P., Krauß, S., Göken, M., & Merle, B. (2018). Influence of stacking fault energy and dislocation character on slip transfer at coherent twin boundaries studied by micropillar compression. Acta Materialia, 154, 261-272. https://dx.doi.org/10.1016/j.actamat.2018.05.037

MLA:
Liebig, Jan Philipp, et al. "Influence of stacking fault energy and dislocation character on slip transfer at coherent twin boundaries studied by micropillar compression." Acta Materialia 154 (2018): 261-272.

BibTeX: 

Last updated on 2019-28-05 at 13:30