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

Liebig JP, Krauß S, Göken M, Merle B (2018)

Publication Status: Published

Publication Type: Journal article

Publication year: 2018

Journal

Acta Materialia Elsevier

Publisher: PERGAMON-ELSEVIER SCIENCE LTD

Book Volume: 154

Pages Range: 261-272

DOI: 10.1016/j.actamat.2018.05.037

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.

Authors with CRIS profile

Jan Philipp Liebig Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Sebastian Krauß Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Benoit Merle Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

In-situ nanomechanics and FIB tomography of thin films (EXC315 EAM (A2-3)) Exzellenz-Cluster Engineering of Advanced Materials Nov. 1, 2012 - Oct. 31, 2017

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://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: Download