Study of loop-loop and loop-edge dislocation interactions in bcc iron

Y.N. Osetsky, D.J. Bacon, F. Gao, A. Serra, B.N. Singh

    Research output: Contribution to journalConference articleResearchpeer-review


    Recent theoretical calculations and atomistic computer simulations have shown that one-dimensional glissile clusters of self-interstitial atoms (SIAs) play an important role in the evolution of microstructure in metals and alloys under cascade damage conditions. Recently, it has been proposed that the evolution of heterogeneities such as dislocation decoration and rafts has serious impacts on the mechanical properties on neutron-irradiated metals. In the present work, atomic-scale computer modelling (ASCM) has been applied to study the mechanisms for the formation of such microstructure in bcc iron. It is shown that glissile clusters with parallel Burgers vectors interact strongly and can form extended immobile complexes, i.e., rafts. Similar attractive interaction exists between dislocation loops and an edge dislocation. These two mechanisms may be responsible for the formation of extended complexes of dislocation loops below the extra half-plane of edge dislocations. The interaction energies between loops and between an edge dislocation and loops has been calculated as a function of distance using ASCM and the results for long-range interactions are in good agreement with the results of isotropic elasticity calculations. (C) 2000 Elsevier Science B.V. All rights reserved.
    Original languageEnglish
    JournalJournal of Nuclear Materials
    Issue numberPart b
    Pages (from-to)784-788
    Publication statusPublished - 2000
    Event9th International Conference on Fusion Reactor Materials - Colorado Springs, CO, United States
    Duration: 10 Oct 199915 Oct 1999
    Conference number: 9


    Conference9th International Conference on Fusion Reactor Materials
    Country/TerritoryUnited States
    CityColorado Springs, CO


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