Grain boundary formation by remnant dislocations from the de-twinning of thin nano-twins

We report a grain boundary formation mechanism in face-centred cubic metals with low stacking fault energies. Severe plastic deformation produces primary nano-twins with a twin boundary spacing of several nanometres, followed by secondary twinning through the activation of Shockley partial dislocati...

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Bibliographic Details
Published inScripta materialia Vol. 100; pp. 98 - 101
Main Authors Cao, Y., Wang, Y.B., An, X.H., Liao, X.Z., Kawasaki, M., Ringer, S.P., Langdon, T.G., Zhu, Y.T.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.04.2015
Subjects
De-twinning
Dislocations
Formations
Grain boundaries
Grain boundary
Grain refinement
Nanostructure
Neighbouring
Sessile dislocations
Stacking fault energy
Steel
Twin boundaries
Twinning
Twinning
Steel
De-twinning
Grain refinement
Grain boundary
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Summary:We report a grain boundary formation mechanism in face-centred cubic metals with low stacking fault energies. Severe plastic deformation produces primary nano-twins with a twin boundary spacing of several nanometres, followed by secondary twinning through the activation of Shockley partial dislocations. The partial dislocations interact with primary twin boundaries, resulting in de-twinning of the primary twins and producing very high densities of sessile dislocations. The accumulation of these dislocations produces new grain boundaries with neighbouring grains having similar orientations.
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ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2015.01.001