Stability and mobility of defect clusters in copper under displacement cascade conditions

Abe, Hiroaki; Sekimura, Naoto; Yang, Yong

doi:10.1016/j.jnucmat.2003.08.006

Cited by 38 publications

(26 citation statements)

References 27 publications

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“…The distances between the multiple defects agreed well with the estimation obtained from TRIM. 19,26) On the other hand, as indicated with arrows in Fig. 1, a large number of defects were evidently distributed over distances exceeding those expected from subcascade events.…”

Section: Evolution Of Displacement Cascadesmentioning

confidence: 89%

“…24,25) The features located within a distance of 20 nm were regarded as defects generated from the subcascades. 19) Multiple contrast features appeared in single video frames and were characteristic of heavy-ion irradiations, while no subcascades have been detected from light ion irradiations such as carbon ions. The probability that multiple independent ions pass through and form defect clusters within such small areas is far smaller than detected.…”

Section: Evolution Of Displacement Cascadesmentioning

confidence: 99%

“…Evidently, there is no report that verifies the existence of interstitial-type defects in copper and gold at temperatures above 500 K; however, our recent in-situ TEM observations have provided evidence for these defects even at temperatures of 700 K and above. 19) However, the characteristics of the glissile defects and related cascade effects are still unclear.…”

Section: Introductionmentioning

confidence: 99%

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Stability and Mobility of Interstitial-Type Defect Clusters Generated from Displacement Cascades in Copper and Gold by <I>In-Situ</I> Transmission Electron Microscopy

2005

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In-situ TEM observations were carried out in copper and gold under 100 keV C þ , 240 keV Cu þ , 600 keV Kr 2þ , and 900 keV Xe 3þ irradiations from 573 to 823 K, in order to obtain direct experimental insights into the defect accumulation processes. Defect clusters corresponding to displacement cascades were observed to be unstable depending on the temperature, ion species, and fluence. Multiple (2 or 3) defect clusters showing up with their contrast in the same video frames were considered to be features associated with subcascades and high mobility of these clusters when located within 20 nm and from 20 to 140 nm, respectively. Instability and diffusion of defect clusters were also detected under ion irradiation. The directions of the cascade-driven and instability-driven motions of the defect clusters were strongly related to crowdion directions, suggesting that the underlying mechanism is based on the motion of crowdion-related glissile defects. This instability is interpreted as the transition of sessile defects into glissile ones. The effects of intra-and inter-cascades on the formation of glissile defects are suggested based on their dependence on the ion species and flux.

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Section: Evolution Of Displacement Cascadesmentioning

confidence: 89%

Section: Evolution Of Displacement Cascadesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stability and Mobility of Interstitial-Type Defect Clusters Generated from Displacement Cascades in Copper and Gold by <I>In-Situ</I> Transmission Electron Microscopy

2005

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“…The movement has, however, been observed by many researchers. 12,13,18) The effect of C in Cu on the diffusion rate of point defect clusters was discussed by Abe et al…”

Section: Migration Of Defect Clustersmentioning

confidence: 99%

Factors That Influence Cascade-Induced Defect Growth in Pure Metals and Model Alloys

Yoshiie

2005

Mater. Trans.

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For the development of materials in a fusion reactor environment without a fusion reactor, it is important to understand the generation and accumulation of point defects. This paper discusses five important factors in metals that influence the initial stage of defect clustering under cascade damage conditions. The effect of the PKA energy spectrum on damage evolution was explained from the viewpoint of subcascade formation. Two origins of damage rate dependence of defect cluster formation, direct mutual annihilation of point defects and annihilation of point defects at cascade-induced defect clusters, were mentioned. As the effect of motion of interstitial clusters, an example was given to illustrate the strong correlation between the mobility of interstitial clusters and void growth. Thermal activation processes depend on irradiation temperature. Varying irradiation temperature experiment was evaluated as a technique for investigating the point defect processes during irradiation. Migration of alloying elements during irradiation was reviewed from the standpoint of the interaction of alloying elements with point defects.

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“…However, in-situ electron microscope observations of the motion of defects in irradiated specimens 23,24 have not so far confirmed the actual occurrence of the long-range transport of interstitial atom clusters. Instead, these observations point to the possibly significant part played by thermal excitations giving rise to random changes in the direction of motion of clusters or interaction with trapping centers in the bulk of the material 25 that hinder the one-dimensional diffusion of clusters and enhance the three-dimensional character of their motion.…”

Section: Introductionmentioning

confidence: 99%

Segregation of voids in a spatially heterogeneous dislocation microstructure

2004

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We investigate the dynamics of nucleation and the growth of voids in an irradiated material in the presence of a spatially heterogeneous dislocation microstructure. We find that, due to the sensitivity of the void nucleation rate to the local vacancy supersaturation, voids nucleate and grow almost exclusively in the regions where the density of dislocations is low. Numerical simulations show that the relatively high void growth rates observed experimentally in the regions of low dislocation density, leading to segregated evolution of dislocations and voids, can be naturally described by solutions of a spatially heterogeneous reaction-diffusion model that takes continuous nucleation of voids into account but does not assume the occurrence of long-range one-dimensional transport of clusters of self-interstitial atoms through the material.

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Stability and mobility of defect clusters in copper under displacement cascade conditions

Cited by 38 publications

References 27 publications

Stability and Mobility of Interstitial-Type Defect Clusters Generated from Displacement Cascades in Copper and Gold by <I>In-Situ</I> Transmission Electron Microscopy

Stability and Mobility of Interstitial-Type Defect Clusters Generated from Displacement Cascades in Copper and Gold by <I>In-Situ</I> Transmission Electron Microscopy

Factors That Influence Cascade-Induced Defect Growth in Pure Metals and Model Alloys

Segregation of voids in a spatially heterogeneous dislocation microstructure

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