Dislocation depinning from nano-sized irradiation defects in a bcc iron model

Dérès, Julien; Proville, Laurent; Marinica, Mihai-Cosmin

doi:10.1016/j.actamat.2015.07.067

Cited by 27 publications

(10 citation statements)

References 46 publications

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“…At 0.01 dpa, ½<111> loops start to nucleate (see Figure 3 and Figure 4). Many of these loops are bound to an immobile C15 cluster (see Figure 3 and 4 at 0.02 dpa) conforming to observations done by Dérès et al [53]. At the same dose of 0.01 dpa, C15 clusters reach sizes of 40 C15 atoms or equivalently cluster.…”

Section: Results: Nucleation and Transformation Of C15 Clusterssupporting

confidence: 88%

Rearrangement of interstitial defects in alpha-Fe under extreme condition

Chartier

Marinica

2019

Acta Materialia

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Section: Results: Nucleation and Transformation Of C15 Clusterssupporting

confidence: 88%

Rearrangement of interstitial defects in alpha-Fe under extreme condition

Chartier

Marinica

2019

Acta Materialia

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“…The C15-type clusters can form directly in collision cascades and become energetically unstable compared to dislocation loops at sizes of around 50 interstitial atoms [19]. Acting as stationary traps for mobile dislocations, they can have a strong impact on the evolution of the defect structure in iron-based alloys, as observed in previous atomistic simulations [20,21].…”

Section: Introductionmentioning

confidence: 71%

Collision cascades overlapping with self-interstitial defect clusters in Fe and W

Byggmästar

Granberg

Sand

et al. 2019

J. Phys.: Condens. Matter

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Overlap of collision cascades with previously formed defect clusters become increasingly likely at radiation doses typical for materials in nuclear reactors. Using molecular dynamics, we systematically investigate the effects of different pre-existing self-interstitial clusters on the damage produced by an overlapping cascade in bcc iron and tungsten. We find that the number of new Frenkel pairs created in direct overlap with an interstitial cluster is reduced to essentially zero, when the size of the defect cluster is comparable to that of the disordered cascade volume. We develop an analytical model for this reduced defect production as a function of the spatial overlap between a cascade and a defect cluster of a given size. Furthermore, we discuss cascade-induced changes in the morphology of self-interstitial clusters, including transformations between 1/2 1 1 1 and 1 0 0 dislocation loops in iron and tungsten, and between C15 clusters and dislocation loops in iron. Our results provide crucial new cascade-overlap effects to be taken into account in multi-scale modelling of radiation damage in bcc metals.

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“…At each stress increment (<1 MPa), the relaxation was repeated with the same convergence criterion. Increasing gradually the shear stress component τ , corresponding to the orientation [110]{111}, we determined the critical shear stress τ c allowing the dislocation to pass the cavity [61]. An example of a dislocation anchored by a cavity is presented in Fig.…”

Section: A Interaction Between a Nanovoid And A Dislocationmentioning

confidence: 99%

“…From the atomic-scale simulations, we computed τ c for voids with different radius r (see Table I) in order to obtain a relation between f p and r. We followed the same procedure as Ref. [61]. For comparison, we performed the same calculations in the case of Cu, using the EAM developed by Mishin et al [62], with the same simulation cell geometry as for Al.…”

Section: A Interaction Between a Nanovoid And A Dislocationmentioning

confidence: 99%

Modeling the climb-assisted glide of edge dislocations through a random distribution of nanosized vacancy clusters

Reis

Proville

Sauzay

2018

Phys. Rev. Materials

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A multiscale model is developed to simulate the climb-assisted glide of edge dislocations anchored by a random distribution of nanosized vacancy clusters. Atomic-scale simulations allowed us to characterize the interactions between an edge dislocation and nanovoids as a function of their sizes and shapes. The atomic-scale data were used to calibrate the parameters of an elastic line model, which we employed to evaluate the average glide distance of a dislocation with realistic dimensions. To complete our scheme, a standard model for the climb velocity of edge dislocations was enhanced with atomic-scale inputs in order to determine the deformation rate expected through the climb-assisted glide. Our predictions made for the archetypical case of Al are in good agreement with experiments of different types, i.e., tensile deformation tests and steady creep tests.

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Dislocation depinning from nano-sized irradiation defects in a bcc iron model

Cited by 27 publications

References 46 publications

Rearrangement of interstitial defects in alpha-Fe under extreme condition

Rearrangement of interstitial defects in alpha-Fe under extreme condition

Collision cascades overlapping with self-interstitial defect clusters in Fe and W

Modeling the climb-assisted glide of edge dislocations through a random distribution of nanosized vacancy clusters

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