Ion-irradiation experiment for the fundamental studies of damage evolution of fusion materials

Kitagawa, K.; Yamakawa, Kohji; Fukushima, Hiroshi; Yoshiie, T.; Hayashi, Yoshihiko; Yoshida, Hiroyuki; Shimomura, Yoshiharu; Kiritani, M.

doi:10.1016/0022-3115(85)90175-8

Cited by 40 publications

(12 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fe yield at 300 K agrees rather well with some recently reported results of Kitagawa, et al [10]. However, our Ni yield disagrees with those of Robinson [11] and Kitagawa [10].…”

Section: Resultssupporting

confidence: 85%

See 1 more Smart Citation

The collapse of defect cascades to dislocation loops

Kirk

Robertson

Jenkins

et al. 1987

Journal of Nuclear Materials

100

View full text Add to dashboard Cite

We review a number of experiments that we have recently performed to investigate the collapse of defect cascades to dislocation loops. This important ion and neutron irradiation phenomenon has been studied with in situ ion bombardment in the Argonne National Laboratory High Voltage Electron Microscope -Ion Accelerator Facility at temperatures of 30 and 300 K in CugAu, Cu, and Fe, and 30, 300 and 600 K in Ni. These experiments have demonstrated that individual defect cascades collapse to dislocation loops athermally at 30 K in some materials (Ni, Cu and CU3AU), while in another material (Fe) only overlapped cascades produced dislocation loops. A slight sensitivity to the irradiation temperature is demonstrated in Cu-jAu and Fe, and a strong dependence on the irradiation temperature is seen in Ni. This phenomenon of cascade collapse to dislocation loops in metals at 30 K provides an understanding for previous neutron irradiation data. The more detailed dependencies of the collapse probability on material, temperature, bombarding ion dose, ion energy and ion mass contribute much information to a thermal spike model of the collision cascade which we will describe.

show abstract

“…Fe yield at 300 K agrees rather well with some recently reported results of Kitagawa, et al [10]. However, our Ni yield disagrees with those of Robinson [11] and Kitagawa [10].…”

Section: Resultssupporting

confidence: 85%

“…However, our Ni yield disagrees with those of Robinson [11] and Kitagawa [10]. Finally, a correlation can be made with the resistivity data of low temperature (5 K) fast neutron bombardment in these pure metals [4].…”

Section: Resultscontrasting

confidence: 72%

The collapse of defect cascades to dislocation loops

Kirk

Robertson

Jenkins

et al. 1987

Journal of Nuclear Materials

100

View full text Add to dashboard Cite

show abstract

“…However, if one assumes a linear defect accumulation up to 0.0026 dpa and that each atomic displacement results in a swelling corresponding to one atomic volume for perfect silicon carbide by then, as a very rough estimation, a surviving defect fraction to NRT-dpa can be derived to be 21%. 9) Since the fluences for apparent cascade overlapping onset in facecentered cubic metals are generally estimated to be within a lower milli-dpa range, 10) cascade overlapping should not impose a large error to this estimation with a power law index of 0.81. The production and recovery behavior of individual defect specie will be studied in more details in separate works.…”

Section: Resultsmentioning

confidence: 99%

Low Temperature Swelling in Beta-SiC Associated with Point Defect Accumulation

Katoh

Kishimoto

2002

Mater. Trans.

View full text Add to dashboard Cite

An experimental technique to characterize irradiation-induced swelling, or isotropic volume expansion, through a combined utilization of medium-to-high energy accelerators and interferometric surface profilometry, was established. The technique was successfully applied to a characterization of swelling behavior in beta-silicon carbide arising from the accumulation of point defects at relatively low temperatures, i.e., 333-873 K, as a function of fluence level, displacement damage rate and irradiation temperature. Swelling rate and swelling at any given fluence level exhibited a negative dependence on irradiation temperature. The saturated low temperature swelling fell on the lower edge of neutron irradiated swelling data band. The influence of displacement damage rate appeared unremarkable. An additional study on the synergistic effect of atomic displacement damage and helium production revealed an enhancement of low temperature swelling in silicon carbide in the presence of helium.

show abstract

“…12,[23][24][25] The areal number density of SFT increases with increasing ion dose until spatial overlapping of cascades occurs, suggesting that vacancy clusters are produced from cascade collisions. But the formation of SFT was not reported previously for ion-irradiated aluminum.…”

Section: B Ion and Neutron Irradiationmentioning

confidence: 99%

Formation of stacking-fault tetrahedra in aluminum irradiated with high-energy particles at low-temperatures

et al. 2004

Self Cite

View full text Add to dashboard Cite

Stacking-fault tetrahedra ͑SFT͒ are typical vacancy clusters in fcc metals. SFT have been, however, considered to be unstable in aluminum because of its high stacking-fault energy, until the recent finding of SFT in thin aluminum foils subjected to a tensile fracture. This study confirmed that SFT form in aluminum following irradiation with high-energy particles. In electron irradiation, SFT with an average size of 2 nm formed below 203 K, while a larger irradiation intensity at lower temperature induced SFT with a larger number density. Irradiation with 60-keV Al ϩ ions induced SFT below room temperature, although the defect yield ͑the ratio of the number of defect clusters to the number of incident ions͒ was about 10 Ϫ3 , considerably smaller than that in the other fcc pure metals. With neutron irradiation below 15 K to a fluence of 2ϫ10 21 neutrons m Ϫ2 , SFT were not observed at room temperature. Instead, dislocation loops were observed to form and to disappear during observation with 120-kV electrons that do not cause atomic displacements. Tensile fracture of aluminum thin foil induced SFT at up to 400 K, which is close to the temperature at which SFT become unstable in isochronal annealing experiments. These results suggest that a high concentration of vacancies at lower temperature tends to cause SFT to form rather than vacancy-type dislocation loops in aluminum.

show abstract

Ion-irradiation experiment for the fundamental studies of damage evolution of fusion materials

Cited by 40 publications

References 2 publications

The collapse of defect cascades to dislocation loops

The collapse of defect cascades to dislocation loops

Low Temperature Swelling in Beta-SiC Associated with Point Defect Accumulation

Formation of stacking-fault tetrahedra in aluminum irradiated with high-energy particles at low-temperatures

Contact Info

Product

Resources

About