Twinning via the motion of incoherent twin boundaries nucleated at grain boundaries in a nanocrystalline Cu alloy

Authors: An, X.H., Song, M., Huang, Y., Liao, X.Z., Ringer, S.P., Langdon, T.G. and Zhu, Y.T.

Journal: Scripta Materialia

Volume: 72-73

Pages: 35-38

ISSN: 1359-6462

DOI: 10.1016/j.scriptamat.2013.10.014

Abstract:

We report the formation of deformation twins in a nanocrystalline Cu-25 at.% Ni alloy with medium stacking fault energy via the propagation of Σ3{1 1 2} incoherent twin boundaries (ITBs) that are nucleated from grain boundaries. This deformation twinning process does not generate net macroscopic strain since the Burgers vectors of the three partial dislocations on three successive {1 1 1} planes comprising an ITB sum to zero. The moving direction of ITBs determines the occurrence of twinning or detwinning in nanocrystalline materials. © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Source: Scopus