Screw misfit dislocations perpendicular to one or two free surfaces

When a screw dislocation pierces one or two free surface(s), noticeable elastic relaxation takes place nearby these surfaces. To refine the theoretical interpretation of an electron microscopy image this relaxation should be included in a precise imaging model. In the present work, the relaxation fi...

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Bibliographic Details
Published inPhilosophical magazine letters Vol. 98; no. 6; pp. 227 - 239
Main Authors Ghabri, Hajer, Neily, Salem, Youssef, Sami, Bonnet, Roland
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 03.06.2018
Taylor & Francis Ltd
Subjects
Bicrystals
Electron microscopy
free surface
Free surfaces
heterogeneous medium
isotropy
Misfit dislocations
Screw dislocation
Screw dislocations
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Summary:When a screw dislocation pierces one or two free surface(s), noticeable elastic relaxation takes place nearby these surfaces. To refine the theoretical interpretation of an electron microscopy image this relaxation should be included in a precise imaging model. In the present work, the relaxation field is evaluated for a periodic set of misfit screw dislocations normal to the free surface of a semi-infinite or plate-like heterogeneous bicrystal. The proposed approach uses an appropriate combination of known biperiodic elastic fields. For a homogeneous medium and when the period increases, the results around a misfit screw dislocation converge to those of Eshelby and Stroh (1951) who considered an isolated translation screw dislocation.
ISSN:0950-0839
1362-3036
DOI:10.1080/09500839.2018.1528396