Effects of neutron irradiation on properties of refractory metals

Gorynin, I. V.; Ignatov, V. A.; Рыбин, В. В.; Fabritsiev, S.A.; Казаков, В. А.; Chakin, V.; Tsykanov, V. A.; Barabash, V.; Prokofyev, Y.G.

doi:10.1016/s0022-3115(09)80079-2

Cited by 44 publications

(33 citation statements)

References 3 publications

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“…General trends in previously reported irradiated electrical resistivity data [12][13][14] after high dose exposure (100-610 · 10 24 n/m 2 , E > 0.1 MeV) are consistent with the results reported here: (1) the largest increase in electrical resistivity was observed at lower irradiation temperatures, and (2) small increases in electrical resistivity were observed at higher irradiation temperatures. However, decreases in electrical resistivity have been reported at relatively high irradiation temperatures (910°C and 1050°C).…”

Section: Change In Electrical Resistivity After Irradiationsupporting

confidence: 91%

“…Electrical resistivity measurements may also be used as an indirect measure of defect density, where larger increases in electrical resistivity are observed following irradiation at lower temperatures due to the presence of a higher number density of defects [12][13][14]. The purpose of this work is to determine the change in hardness and electrical resistivity of wrought LCAC molybdenum sheet following irradiation and post-irradiation annealing and to use this data as an indirect measure of defect density for determining the kinetics of recovery and defect annihilation following irradiation between 270°C and 1100°C.…”

Section: Introductionmentioning

confidence: 99%

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Hardness and electrical resistivity of molybdenum in the post-irradiated and annealed conditions

Cockeram

Hollenbeck

Snead

2005

Journal of Nuclear Materials

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Section: Change In Electrical Resistivity After Irradiationsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Hardness and electrical resistivity of molybdenum in the post-irradiated and annealed conditions

Cockeram

Hollenbeck

Snead

2005

Journal of Nuclear Materials

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“…1,2 It is a promising plasma facing material, for both the divertor and the first wall, principally because of its high melting temperature and resistance to sputtering by low-energy ions. 3,4 Second, recent advancements in nanoengineering have enabled a tailoring of microstructures and the production of ultrafine-grained and nanocrystalline tungsten with significantly enhanced mechanical behavior. 5 This nanoengineered material displays very high strength but localized shearing rather than uniform plastic deformation and/or cracking under loading.…”

Section: Introductionmentioning

confidence: 99%

Bond-order potential for simulations of extended defects in tungsten

et al. 2007

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We present a bond-order potential (BOP) for the bcc transition metal tungsten. The bond-order potentials are a real-space semiempirical scheme for the description of interatomic interactions based on the tight-binding approximation. In the hierarchy of atomic-scale-modeling methods the BOPs thus provide a direct bridge between electronic-structure and atomistic techniques. Two variants of the BOP were constructed and extensively tested against accurate first-principles methods in order to assess the potentials' reliability and applicability. A comparison of the BOP with a central-force potential is used to demonstrate that a correct description of directional mixed covalent and metallic bonds is crucial for a successful and fully transferable model. The potentials are applied in studies of low-index surfaces, symmetrical tilt grain boundaries, and dislocations. We present a bond-order potential ͑BOP͒ for the bcc transition metal tungsten. The bond-order potentials are a real-space semiempirical scheme for the description of interatomic interactions based on the tight-binding approximation. In the hierarchy of atomic-scale-modeling methods the BOPs thus provide a direct bridge between electronic-structure and atomistic techniques. Two variants of the BOP were constructed and extensively tested against accurate first-principles methods in order to assess the potentials' reliability and applicability. A comparison of the BOP with a central-force potential is used to demonstrate that a correct description of directional mixed covalent and metallic bonds is crucial for a successful and fully transferable model. The potentials are applied in studies of low-index surfaces, symmetrical tilt grain boundaries, and dislocations.

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“…Very often, the tungsten specimens break in the elastic region before reaching yield. 8,9) Therefore to avoid brittle fracture, the mechanical properties of tungsten in this study have been measured in compression after irradiation in a proton beam.…”

Section: Introductionmentioning

confidence: 99%

“…6,7,9,17) In these studies, the mechanical properties were either measured in bending or in tension or inferred through hardness measurements. When the properties were measured in bending or tension (at 300…”

Section: Introductionmentioning

confidence: 99%

The Effect of 800 MeV Proton Irradiation on the Mechanical Properties of Tungsten

et al. 2002

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For the Accelerator Production of Tritium (APT) and the Accelerator Driven Transmutation Facility (ADTF), tungsten is being proposed as a target material to produce neutrons. Previous work has shown that the mechanical properties of tungsten are degraded from irradiation in a fission neutron flux but little work has been performed on the irradiation of tungsten in a high energy proton beam. In this study, tungsten rods were irradiated at the 800 MeV Los Alamos Neutron Science Center (LANSCE) proton accelerator for six months. To avoid corrosion during irradiation, the rods were slip fit with thin (0.25 mm thick) 304L stainless steel (SS) or (0.125 mm thick) annealed Alloy 718 tubing. After irradiation to a maximum dose in the tungsten of 23.3 dpa at T irr = 50-270 • C, the clad rods were opened in the hot cells and the tungsten was removed. The tungsten was then sliced into short compression specimens (∼ 3 mm long). Hardness tests and compression tests were performed on the tungsten rods to assess the effect of irradiation on their mechanical properties. Results show an increase in hardness with dose and irradiation temperature and an increase in yield stress with dose.

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Effects of neutron irradiation on properties of refractory metals

Cited by 44 publications

References 3 publications

Hardness and electrical resistivity of molybdenum in the post-irradiated and annealed conditions

Hardness and electrical resistivity of molybdenum in the post-irradiated and annealed conditions

Bond-order potential for simulations of extended defects in tungsten

The Effect of 800 MeV Proton Irradiation on the Mechanical Properties of Tungsten

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