Low-dose neutron irradiation damage in copper

English, C.A.; Eyre, B.L.; Muncie, J.W.

doi:10.1080/01418618708214400

Cited by 45 publications

(44 citation statements)

References 25 publications

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“…͑37͒ for annealed pure copper with low dislocation density (ϳ10 11 m Ϫ2 ) irradiated up to doses of 10 Ϫ4 -10 Ϫ2 NRT dpa. [22][23][24] The material parameters used for copper are listed in Table I. In this case, the ratio of ␤/R cr ranges from 11.2 to 4.1 between 523 and 623 K. It can be seen from Fig.…”

Section: A Void Nucleation In Coppermentioning

confidence: 99%

Void nucleation at elevated temperatures under cascade-damage irradiation

Семенов

Woo

2002

Phys. Rev. B

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The effects on void nucleation of fluctuations respectively due to the randomness of point-defect migratory jumps, the random generation of free point defects in discrete packages, and the fluctuating rate of vacancy emission from voids are considered. It was found that effects of the cascade-induced fluctuations are significant only at sufficiently high total sink strength. At lower sink strengths and elevated temperatures, the fluctuation in the rate of vacancy emission is the dominant factor. Application of the present theory to the void nucleation in annealed pure copper neutron-irradiated at elevated temperatures with doses of 10 Ϫ4 -10 Ϫ2 NRT dpa showed reasonable agreement between theory and experiment. This application also predicts correctly the temporal development of large-scale spatial heterogeneous microstructure during the void nucleation stage.Comparison between calculated and experimental void nucleation rates in neutron-irradiated molybdenum at temperatures where vacancy emission from voids is negligible showed reasonable agreement as well. It was clearly demonstrated that the athermal shrinkage of relatively large voids experimentally observable in molybdenum at such temperatures may be easily explained in the framework of the present theory.

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Section: A Void Nucleation In Coppermentioning

confidence: 99%

Void nucleation at elevated temperatures under cascade-damage irradiation

Семенов

Woo

2002

Phys. Rev. B

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“…Indeed, the total sink strength of the vacancy loops and stacking-fault tetrahedra, which are also present in such heterogeneous microstructure, is found to be much smaller than those of the voids and the interstitial loops. 15 Moreover, the spatial distribution of the vacancy clusters themselves is practically homogeneous. 15 As shown in Ref.…”

Section: Discussionmentioning

confidence: 99%

“…15 Moreover, the spatial distribution of the vacancy clusters themselves is practically homogeneous. 15 As shown in Ref. 29, the instability of the homogeneous evolution in that case is related to the saturation of the homogeneous void growth, caused by the continuous production of small immobile interstitial clusters.…”

Section: Discussionmentioning

confidence: 99%

“…͑35͒ is difficult to realize in this case. In this regard, we note that the nonperiodic spatial segregation of voids and dislocation loops, with the interstitial loops concentrating in localized long narrow patches separated by void growth regions of size of about several microns, 14,15 is difficult to explain within the framework of the instability in the homogeneous vacancy loop population. Indeed, the total sink strength of the vacancy loops and stacking-fault tetrahedra, which are also present in such heterogeneous microstructure, is found to be much smaller than those of the voids and the interstitial loops.…”

Section: Discussionmentioning

confidence: 99%

“…Bifurcations in the evolution of such systems often lead to the qualitative changes in the system behavior, resulting in pattern formation [1][2][3][4][5] via spatial and temporal self-organization in the defect populations. Examples are bubble and void lattices, 6,7 defect walls, [8][9][10][11][12][13][14][15] and various arrays of dislocation loops and stacking fault tetrahedra. [16][17][18] Pattern formation due to the development of instability in the homogeneous vacancy loop population is one of the most actively studied cases.…”

Section: Introductionmentioning

confidence: 99%

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Spatial ordering of primary defects at elevated temperatures

Семенов

Woo

2005

Phys. Rev. B

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We consider the microstructure evolution of a nonequilibrium system of primary defects, in which mobile point defects, vacancy loops, and sessile interstitial clusters are continuously produced by cascade-damage irradiation. It is shown that in a fully annealed metal, a spatially homogeneous microstructure may become unstable if the yield of vacancy clusters in collision cascades is sufficiently low. Unlike cases studied in the literature, in which sessile interstitial clusters are not produced, we found that the instability condition can only be satisfied for a finite period of time, the duration of which depends on the density of the network dislocation. Spatial heterogeneity starts to form from a homogeneous vacancy loop population, leading to the eventual accumulation of almost all vacancy clusters within very sharp walls. The spatial distribution of interstitial clusters, on the other hand, is relatively homogeneous, simply following the spatial variations of the net interstitial flux. The spatial heterogeneity develops with the growth of some concentration peaks and the disappearance of others. As a result, the surviving peaks form an increasingly well-defined periodic structure. Nevertheless, as the total sink density of interstitial clusters and loops becomes sufficiently large, the periodic structure disappears, and spatial homogeneity of damage microstructure eventually returns.

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Effect of oxygen on vacancy cluster morphology in metals

Zinkle

Lee

1990

Metall Trans A

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Low-dose neutron irradiation damage in copper

Cited by 45 publications

References 25 publications

Void nucleation at elevated temperatures under cascade-damage irradiation

Void nucleation at elevated temperatures under cascade-damage irradiation

Spatial ordering of primary defects at elevated temperatures

Effect of oxygen on vacancy cluster morphology in metals

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