Interaction of Lomer-Cottrell locks with screw dislocations

Autor(en)

Gunther Schöck

Abstrakt

In fcc crystals, dislocations are dissociated into partial dislocations and, therefore, restricted to move on lcub111rcub glide planes. By junction reactions with dislocations on two intersecting lcub111rcub planes, Lomer-Cottrell dislocations along ?110? directions can be formed which are barriers for approaching screw dislocations. Treating the interaction between a dissociated screw dislocation and a LC lock conventionally, using classical continuum theory and assuming the partials to be Volterra dislocations, leads to erroneous conclusions. A realistic result can only be obtained in the framework of the Peierls model, treating the partials as Peierls dislocations and explicitly taking account of the change in atomic misfit energy in the glide plane. At even moderate stresses (at less than 3 times 10-3 µ in Cu), the screw will combine with the LC lock to form a Hirth lock. As a result, the nature of the repulsive force will change drastically.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Universität Wien

Journal

Philosophical Magazine

Band

90

Seiten

629-636

Anzahl der Seiten

8

ISSN

1478-6435

DOI

https://doi.org/10.1080/14786430903193274

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ec609476-4571-4df3-b11d-27ccf5263e95