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

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Kuvaus

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.
Alkuperäiskielienglanti
Artikkeli405402
LehtiJournal of Physics. Condensed Matter
Vuosikerta31
Numero40
Sivumäärä12
ISSN0953-8984
DOI - pysyväislinkit
TilaJulkaistu - 9 lokakuuta 2019
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

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@article{881d7a2cd3094e1ebf1ce5f5acf4e95a,
title = "Radiation damage in tungsten from cascade overlap with voids and vacancy clusters",
abstract = "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.",
keywords = "ALLOYS, DEFECT PRODUCTION, DISLOCATION LOOPS, EVOLUTION, IN-SITU, MOLECULAR-DYNAMICS SIMULATION, NEUTRON-IRRADIATION, PURE TUNGSTEN, cascade overlap, dislocation loops, molecular dynamics, radiation damage, tungsten, voids, 114 Physical sciences",
author = "A. Fellman and Sand, {A. E.} and Jesper Byggm{\"a}star and Kai Nordlund",
year = "2019",
month = "10",
day = "9",
doi = "10.1088/1361-648X/ab2ea4",
language = "English",
volume = "31",
journal = "Journal of Physics. Condensed Matter",
issn = "0953-8984",
publisher = "IOP Publishing",
number = "40",

}

Radiation damage in tungsten from cascade overlap with voids and vacancy clusters. / Fellman, A.; Sand, A. E.; Byggmästar, Jesper; Nordlund, Kai.

julkaisussa: Journal of Physics. Condensed Matter, Vuosikerta 31, Nro 40, 405402, 09.10.2019.

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

TY - JOUR

T1 - Radiation damage in tungsten from cascade overlap with voids and vacancy clusters

AU - Fellman, A.

AU - Sand, A. E.

AU - Byggmästar, Jesper

AU - Nordlund, Kai

PY - 2019/10/9

Y1 - 2019/10/9

N2 - 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.

AB - 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.

KW - ALLOYS

KW - DEFECT PRODUCTION

KW - DISLOCATION LOOPS

KW - EVOLUTION

KW - IN-SITU

KW - MOLECULAR-DYNAMICS SIMULATION

KW - NEUTRON-IRRADIATION

KW - PURE TUNGSTEN

KW - cascade overlap

KW - dislocation loops

KW - molecular dynamics

KW - radiation damage

KW - tungsten

KW - voids

KW - 114 Physical sciences

U2 - 10.1088/1361-648X/ab2ea4

DO - 10.1088/1361-648X/ab2ea4

M3 - Article

VL - 31

JO - Journal of Physics. Condensed Matter

JF - Journal of Physics. Condensed Matter

SN - 0953-8984

IS - 40

M1 - 405402

ER -