標題: Plastic response of dislocation glide in solid helium under dc strain-rate loading
作者: Zhou, Caizhi
Su, Jung-Jung
Graf, Matthias J.
Reichhardt, Charles
Balatsky, Alexander V.
Beyerlein, Irene J.
電子物理學系
Department of Electrophysics
公開日期: 24-七月-2013
摘要: We develop a model for the gliding of dislocations and plasticity in solid He-4. This model takes into account the Peierls barrier, multiplication and interaction of dislocations, as well as classical thermally and mechanically activated processes leading to dislocation glide. We specifically examine the dc stress-strain curve and how it is affected by temperature, strain rate, and dislocation density. As a function of temperature and shear strain, we observe plastic deformation and discuss how this may be related to the experimental observation of elastic anomalies in solid hcp He-4 that have been discussed in connection with the possibility of supersolidity or giant plasticity. Our theory gives several predictions for the dc stress strain curves, for example, the yield point and the change in the work-hardening rate and plastic dissipation peak, that can be compared directly to constant strain-rate experiments and thus provide bounds on model parameters.
URI: http://dx.doi.org/10.1103/PhysRevB.88.024513
http://hdl.handle.net/11536/22179
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.88.024513
期刊: PHYSICAL REVIEW B
Volume: 88
Issue: 2
結束頁: 
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