Dose dependence of defect accumulation in neutron irradiated copper and iron

M. Eldrup; B. N. Singh; S. J. Zinkle; T. S. Byun; K. Farrell

doi:10.1016/S0022-3115(02)01160-1

Dose dependence of defect accumulation in neutron irradiated copper and iron

M. Eldrup, B. N. Singh, S. J. Zinkle, T. S. Byun, K. Farrell

Radiation Effects and Microstructural An

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Abstract

In order to investigate the difference in defect accumulation between fcc Cu and bcc Fe, tensile specimens were neutron irradiated at ≃70 °C in the HFIR reactor at Oak Ridge National Laboratory to fluences in the range of 4.5 × 10²⁰-4.7 × 10²⁴ n/m² (E >1 MeV) corresponding to displacement dose levels in the range of about 0.0001-0.8 dpa. Irradiated specimens were characterized using positron annihilation spectroscopy, transmission electron microscopy and electrical conductivity measurements. A limited number of iron specimens were also tensile tested. At 0.0001 dpa, a low density of very small vacancy clusters (1-3 vacancies) were detected in iron, while bigger three-dimensional cavities were observed at higher doses. Both their density and average size increased with increasing dose level. In contrast, no such cavities were observed in copper. Irradiation led to an increase in yield stress and a decrease in the uniform elongation for iron.

Original language	English
Pages (from-to)	912-917
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	307-311
Issue number	2 SUPPL.
DOIs	https://doi.org/10.1016/S0022-3115(02)01160-1
State	Published - Dec 2002

Funding

The present research was partly supported by the European Fusion Technology Programme and partly by the Office of Fusion Energy Sciences, Office of Basic Energy Sciences, US Department of Energy under contract DE-AC05-00OR22725 with UT-Battelle, LLC. We wish to thank G. Christiansen, B. Olsen and N.J. Pedersen for technical assistance.

Funders	Funder number
European Fusion Technology Programme
U.S. Department of Energy	DE-AC05-00OR22725
Basic Energy Sciences
Fusion Energy Sciences

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title = "Dose dependence of defect accumulation in neutron irradiated copper and iron",

abstract = "In order to investigate the difference in defect accumulation between fcc Cu and bcc Fe, tensile specimens were neutron irradiated at ≃70 °C in the HFIR reactor at Oak Ridge National Laboratory to fluences in the range of 4.5 × 1020-4.7 × 1024 n/m2 (E >1 MeV) corresponding to displacement dose levels in the range of about 0.0001-0.8 dpa. Irradiated specimens were characterized using positron annihilation spectroscopy, transmission electron microscopy and electrical conductivity measurements. A limited number of iron specimens were also tensile tested. At 0.0001 dpa, a low density of very small vacancy clusters (1-3 vacancies) were detected in iron, while bigger three-dimensional cavities were observed at higher doses. Both their density and average size increased with increasing dose level. In contrast, no such cavities were observed in copper. Irradiation led to an increase in yield stress and a decrease in the uniform elongation for iron.",

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AU - Singh, B. N.

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N2 - In order to investigate the difference in defect accumulation between fcc Cu and bcc Fe, tensile specimens were neutron irradiated at ≃70 °C in the HFIR reactor at Oak Ridge National Laboratory to fluences in the range of 4.5 × 1020-4.7 × 1024 n/m2 (E >1 MeV) corresponding to displacement dose levels in the range of about 0.0001-0.8 dpa. Irradiated specimens were characterized using positron annihilation spectroscopy, transmission electron microscopy and electrical conductivity measurements. A limited number of iron specimens were also tensile tested. At 0.0001 dpa, a low density of very small vacancy clusters (1-3 vacancies) were detected in iron, while bigger three-dimensional cavities were observed at higher doses. Both their density and average size increased with increasing dose level. In contrast, no such cavities were observed in copper. Irradiation led to an increase in yield stress and a decrease in the uniform elongation for iron.

AB - In order to investigate the difference in defect accumulation between fcc Cu and bcc Fe, tensile specimens were neutron irradiated at ≃70 °C in the HFIR reactor at Oak Ridge National Laboratory to fluences in the range of 4.5 × 1020-4.7 × 1024 n/m2 (E >1 MeV) corresponding to displacement dose levels in the range of about 0.0001-0.8 dpa. Irradiated specimens were characterized using positron annihilation spectroscopy, transmission electron microscopy and electrical conductivity measurements. A limited number of iron specimens were also tensile tested. At 0.0001 dpa, a low density of very small vacancy clusters (1-3 vacancies) were detected in iron, while bigger three-dimensional cavities were observed at higher doses. Both their density and average size increased with increasing dose level. In contrast, no such cavities were observed in copper. Irradiation led to an increase in yield stress and a decrease in the uniform elongation for iron.

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Dose dependence of defect accumulation in neutron irradiated copper and iron

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