Dynamic properties of edge dislocations decorated by interstitial loops in α-iron and copper

Yu N. Osetsky, D. J. Bacon, Z. Rong, B. N. Singh

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Clusters of self-interstitial atoms (SIAs) in the form of parallel crowdions are created directly in high-energy displacement cascades produced in metals by neutron irradiation. They are equivalent to small perfect dislocation loops and, in isolation in pure metals, undergo fast thermally-activated glide in the direction of their Burgers vector. Their strain field and ability to glide allows long-range interaction with other extended defects. Indeed, dislocations decorated by dislocation loops are commonly observed after neutron irradiation. Dislocations gliding under applied stress also encounter these mobile defects. These effects influence mechanical properties and require further investigation. This paper presents results from an atomic-scale study of copper and α-iron at either 0 K or 300 K. Loop drag and breakaway effects are investigated for an edge dislocation under applied stress interacting with a row of SIA loops below its glide plane. The maximum speed at which a loop is dragged is lower in copper than iron, and the applied stress at which this occurs is also lower. These differences in the dynamics of cluster-dislocation interaction are determined by the atomic structure of the defects and cannot be investigated by continuum treatment.

Original languageEnglish
Pages (from-to)745-754
Number of pages10
JournalPhilosophical Magazine Letters
Volume84
Issue number11
DOIs
StatePublished - Nov 2004

Funding

ACKNOWLEDGEMENTS This research was sponsored by the Office of Fusion Energy Sciences and Division of Materials Sciences and Engineering, U.S. Department of Energy under contract DE-AC05-00OR22725 with UT-Battelle, LLC and supported by a grant from the UK Engineering and Physical Sciences Research Council, including a research studentship for Z.R., who also acknowledges the Higher Education Funding Council for England for an ORS award. The present work was partially funded by the European Fusion Technology Programme.

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