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Dislocation-Defect Interactions in Materials.

DE200415007734

Publication Date	2003
Personal Author	Robach, J. S.; Robertson, I. M.; Ahn, D. C.; Sofronis, P.; Wirth, B. D.; Arsenlis, T.
Page Count	20
Abstract	In order to develop predictive models of the mechanical response of irradiated materials it is necessary to understand the fundamental physical processes controlling the deformation. This is particularly important near yielding where local defect interactions may dominate the behaviour. Dislocation-defect interactions in copper containing various densities and distributions of stacking-fault tetrahedra and small dislocation loops were examined dynamically using the in-situ TEM straining technique. Defect annihilation mechanisms as well as the conditions required to produce defect-free channels are proposed. The experimental results are compared to atomistic simulations and continuum mechanics calculations of unit interactions. Based on these observations, an improved continuum model of the mechanical behaviour of irradiated materials is presented.
Keywords	Irradiation Prediction models Deformation Physical process analysis Dislocation Defects Interactions Copper Mechanical properties Continuum modeling Defect annihilation mechanisms Atomistic simulations
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200507

Dislocation-Defect Interactions in Materials.

Dislocation-Defect Interactions in Materials.
DE200415007734

Publication Date	2003
Personal Author	Robach, J. S.; Robertson, I. M.; Ahn, D. C.; Sofronis, P.; Wirth, B. D.; Arsenlis, T.
Page Count	20
Abstract	In order to develop predictive models of the mechanical response of irradiated materials it is necessary to understand the fundamental physical processes controlling the deformation. This is particularly important near yielding where local defect interactions may dominate the behaviour. Dislocation-defect interactions in copper containing various densities and distributions of stacking-fault tetrahedra and small dislocation loops were examined dynamically using the in-situ TEM straining technique. Defect annihilation mechanisms as well as the conditions required to produce defect-free channels are proposed. The experimental results are compared to atomistic simulations and continuum mechanics calculations of unit interactions. Based on these observations, an improved continuum model of the mechanical behaviour of irradiated materials is presented.
Keywords	Irradiation Prediction models Deformation Physical process analysis Dislocation Defects Interactions Copper Mechanical properties Continuum modeling Defect annihilation mechanisms Atomistic simulations
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200507