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Atomistic Simulation of Mobile Defect Clusters in Metals

Published online by Cambridge University Press:  15 February 2011

Yu.N. Osetsky ,
D.J. Bacon  and
A. Serra
Yu.N. Osetsky
Affiliation:
Materials Science and Engineering, Department of Engineering, The University of Liverpool, Liverpool L69 3BX, UK, [email protected]
D.J. Bacon
Affiliation:
Materials Science and Engineering, Department of Engineering, The University of Liverpool, Liverpool L69 3BX, UK
A. Serra
Affiliation:
Dept. Mat. Aplicada III, Universitat Politecnica de Catalunya, Jordi Girona 1-3, E-08034 Barcelona, Spain
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Abstract

The structure, stability and thermally-activated motion of interstitial and vacancy clusters in Fe and Cu have been studied using atomic scale computer simulation. All studied interstitial clusters and perfect interstitial loops (PILs) in Fe are mobile whereas their mobility in Cu can be suppressed at large sizes (bigger than 49–61 self-interstitials depending on the temperature) due to dissociation. A comparative study of relaxed configurations has shown that the structure of small perfect dislocation loops of vacancy and self-interstitial nature is very similar. Molecular dynamics simulation has demonstrated that small perfect vacancy loops (PVLs) in Fe consisting of more than 37 vacancies are stable over a wide temperature range and produce atomic displacements by a thermally-activated movement in the direction of the Burgers vector. The mechanism is qualitatively similar to that of SIA clusters studied earlier. Motion of vacancy loops in Cu does not occur because they transform into sessile configurations similar to stacking fault tetrahedra. These results point to the possibly important contribution of vacancy loop mobility to the difference in radiation damage between bcc and fcc metals, and between fcc metals with different stacking fault energy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 540: Symposium N / Microstructural Processes in Irradiated Materials , 1998 , 649
Copyright
Copyright © Materials Research Society 1999

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