Cascade morphology transition in bcc metals

Setyawan, Wahyu; Selby, Aaron P.; Juslin, Niklas; Stoller, R.E.; Wirth, Brian D.; Kurtz, Richard J.

doi:10.1088/0953-8984/27/22/225402

Cited by 41 publications

(27 citation statements)

References 59 publications

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“…Hence the final defects are effectively the products of two separate cascade regions. In this PKA energy range, the defect production from independent cascades has been shown to follow a power law of the form 2.21(E MD ) 0.74 [39]. Hence, splitting the cascade into two separate regions with a combined energy of 10 keV can potentially result in 20% more defects than from a single 10 keV cascade, not considering the stochastic variations between individual cascades.…”

Section: Discussionmentioning

confidence: 98%

Radiation damage in tungsten from cascade overlap with voids and vacancy clusters

Fellman

Sand

Byggmästar

et al. 2019

J. Phys.: Condens. Matter

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We have performed a systematic molecular dynamics investigation of the effects of overlap of collision cascades in tungsten with pre-existing vacancy-type defects. In particular, we focus on the implications for fusion neutron irradiated tungsten in relation to comparisons with damage production under ion irradiation conditions. We find that overlap of a cascade with a vacancy-type defect decreases the number of new defects with roughly the same functional dependence as previously shown for interstitial clusters. We further find that different mechanisms govern the formation of dislocation loops, resulting in different Burgers vectors, depending on the degree of overlap between the cascade and the defect. Furthermore, we show that overlapping cascades consistently decrease the size of the pre-existing defect. We also observe void-induced cascade splitting at energies far below the subcascade splitting threshold in tungsten. The impact of these mechanisms on radiation damage accumulation and dose rate effects are discussed.

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Section: Discussionmentioning

confidence: 98%

Radiation damage in tungsten from cascade overlap with voids and vacancy clusters

Fellman

Sand

Byggmästar

et al. 2019

J. Phys.: Condens. Matter

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“…Furthermore, they raised the question of the overlap or the vicinity of subcascades and their possible interaction. Interestingly, the formation of large clusters at interfaces between subcascades has been observed in MD cascades in Fe and explained by shock-wave interaction in [11,12].…”

Section: Introductionmentioning

confidence: 84%

A model of defect cluster creation in fragmented cascades in metals based on morphological analysis

Backer

Domain

Becquart

et al. 2018

J. Phys.: Condens. Matter

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The impacts of ions and neutrons in metals cause cascades of atomic collisions that expand and shrink, leaving microstructure defect debris, i.e. interstitial or vacancy clusters or loops of different sizes. In De Backer et al (2016 Europhys. Lett. 115 26001), we described a method to detect the first morphological transition, i.e. the cascade fragmentation in subcascades, and a model of primary damage combining the binary collision approximation and molecular dynamics (MD). In this paper including W, Fe, Be, Zr and 20 other metals, we demonstrate that the fragmentation energy increases with the atomic number and decreases with the atomic density following a unique power law. Above the fragmentation energy, the cascade morphology can be characterized by the cross pair correlation functions of the multitype point pattern formed by the subcascades. We derive the numbers of pairs of subcascades and observed that they follow broken power laws. The energy where the power law breaks indicates the second morphological transition when cascades are formed by branches decorated by chaplets of small subcascades. The subcascade interaction is introduced in our model of primary damage by adding pairwise terms. Using statistics obtained on hundreds of MD cascades in Fe, we demonstrate that the interaction of subcascades increases the proportion of large clusters in the damage created by high energy cascades. Finally, we predict the primary damage of 500 keV Fe ion in Fe and obtain cluster size distributions when large statistics of MD cascades are not feasible.

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“…Our purpose is to compare potentials and characterize them and not to compare directly with experiments. We thus chose to calculate the TDEs in tungsten and iron using all the interatomic potentials along 4 directions 〈100〉, 〈110〉, 〈111〉 and 〈135〉 according to the technique proposed by Setyawan et al [32] using the MD code DYMOKA [33]. The simulations were launched in non cubic boxes 20 × 18 × 16 l.u.…”

Section: ) Tde: Threshold Displacement Energiesmentioning

confidence: 99%

Modelling the primary damage in Fe and W: Influence of the short range interactions on the cascade properties: Part 1 – Energy transfer

Becquart

Backer

Olsson

et al. 2021

Journal of Nuclear Materials

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Cascade morphology transition in bcc metals

Cited by 41 publications

References 59 publications

Radiation damage in tungsten from cascade overlap with voids and vacancy clusters

Radiation damage in tungsten from cascade overlap with voids and vacancy clusters

A model of defect cluster creation in fragmented cascades in metals based on morphological analysis

Modelling the primary damage in Fe and W: Influence of the short range interactions on the cascade properties: Part 1 – Energy transfer

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