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

We report the formation of deformation twins in a nanocrystalline Cu–25at.% Ni alloy with medium stacking fault energy via the propagation of Σ3{112} incoherent twin boundaries (ITBs) that are nucleated from grain boundaries. This deformation twinning process does not generate net macroscopic strain...

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Bibliographic Details
Published inScripta materialia Vol. 72-73; pp. 35 - 38
Main Authors An, X.H., Song, M., Huang, Y., Liao, X.Z., Ringer, S.P., Langdon, T.G., Zhu, Y.T.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.02.2014
Subjects
Grain boundary
Incoherent twin boundary
Nanocrystalline Cu alloy
Twinning
Incoherent twin boundary
Nanocrystalline Cu alloy
Twinning
Grain boundary
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Summary:We report the formation of deformation twins in a nanocrystalline Cu–25at.% Ni alloy with medium stacking fault energy via the propagation of Σ3{112} 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 {111} planes comprising an ITB sum to zero. The moving direction of ITBs determines the occurrence of twinning or detwinning in nanocrystalline materials.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2013.10.014