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Interaction of run-in edge dislocations with twist grain boundaries in Al-a molecular dynamics study
S. Chandra, , M.K. Samal, V.M. Chavan, R.J. Patel
Published in Taylor and Francis Ltd.
2016
Volume: 96
   
Issue: 17
Pages: 1809 - 1831
Abstract
Grain boundaries play an important role in outlining the mechanical properties of crystalline materials. They act as sites for absorption/nucleation of dislocations, which are the main carriers of plastic deformation. In view of this, the interactions between edge dislocations and twist grain boundaries-dislocation pileup, dislocation absorption and dislocation emission were explored by performing molecular dynamics simulations in face-centered cubic Al using embedded atom method. The <110> twist grain boundaries with various misorientation angles were selected for this purpose. It was found that the misorientation angle of boundary and stress anomalies arising from repeated dislocation absorption at the grain boundaries are the important parameters in determining the ability of the boundary to emit dislocations. Complex network of dislocations results in later stages of deformation, which may have a significant effect on the mechanical properties of the material. The peculiarities of dislocation nucleation, their emission from twist grain boundaries and the ramifications of this study towards development of higher length scale material models are discussed. © 2016 Informa UK Limited, trading as Taylor & Francis Group.
About the journal
JournalData powered by TypesetPhilosophical Magazine
PublisherData powered by TypesetTaylor and Francis Ltd.
ISSN14786435