Effect of neutron irradiation on thermal diffusivity of tungsten–rhenium alloys

Fujitsuka, M.; Tsuchiya, B.; Mutoh, Isao; Tanabe, Tatsuhiko; Shikama, Tatsuo

doi:10.1016/s0022-3115(00)00170-7

Cited by 88 publications

(47 citation statements)

References 7 publications

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“…2,3) It was reported that the creep strength of W irradiated with thermal neutrons is higher than that of unirradiated W. This indicates that the substantial solid solution Re, transmuted from W, can increase the creep strength of W. 4) Re and Os also change the physical properties of W. For example, W has a high thermal conductivity, however it decreases to half of pure W by the addition of 5 mass% Re. 5,6) Despite the solubility limit of Re in W is about 26 mass%, 1 phase precipitates (Re 3 W) were formed in the W-5Re and W-10Re alloys after 0.5-0.7 dpa irradiation at 600-1500 C without void formation and affected the bulk properties. 7) Heavy neutron irradiation induced large irradiation hardening in the W-26Re alloy by irradiation induced precipitation.…”

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confidence: 99%

Microstructure Development in Neutron Irradiated Tungsten Alloys

et al. 2011

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The aim of this work is to investigate the influence of neutron irradiation condition, especially temperature, on irradiation hardening and microstructure development in irradiated tungsten-rhenium (W-Re) alloys. Neutron irradiations were carried out in JOYO at the range of 400 to 750 C, up to 1.54 dpa. Micro Vickers hardness tests and micro structural observations using a TEM were performed. Irradiation hardening of WRe alloys irradiated at 538 C were clearly larger than those irradiated at other temperatures. Fine voids and fine needle-or plate-like precipitates were observed in pure W and W-Re alloys irradiated at 538 C, respectively, with high number density. The fine complex microstructure seems to be the cause of the characteristic irradiation hardening.

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Section: )mentioning

confidence: 99%

Microstructure Development in Neutron Irradiated Tungsten Alloys

et al. 2011

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“…For example, tungsten has high thermal conductivity, however this decreases to half the value for pure tungsten by the addition of 5 mass% Re. 5,6) In terms of microstructural evolution, it has been reported that phase precipitates (Re 3 W) were formed in W-xRe alloys after 0.5-0.7 dpa irradiation at 600-1500 C without void formation, and the bulk properties were affected by this precipitation. 7) Heavy neutron irradiation induced large irradiation hardening in W26Re alloy by irradiation-induced precipitation.…”

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confidence: 99%

Precipitation of Solid Transmutation Elements in Irradiated Tungsten Alloys

et al. 2008

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Tungsten-based model alloys were fabricated to simulate compositional changes by neutron irradiation, performed in the JOYO fast test reactor. The irradiation damage range was 0.17-1.54 dpa and irradiation temperatures were 400, 500 and 750 C. After irradiation, microstructural observations and electrical resistivity measurements were carried out. A number of precipitates were observed after 1.54 dpa irradiation. Rhenium and osmium were precipitated by irradiation, which suppressed the formation of dislocation loops and voids. Structures induced by irradiation were not observed so much after 0.17 dpa irradiation. Electrical resistivity measurements showed that the effects of osmium on the electrical resistivity, related to impurity solution content, were larger than that of rhenium. Measurements of electrical resistivity of ternary alloys showed that the precipitation behavior was similar to that in binary alloys.

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“…In particular, the 14 MeV-peak neutron irradiation produces significant displacement damage of the lattice structure creating vacancies, interstitials, and their clusters, as well as generating significant concentrations of transmutation elements (i.e., Re, Os) [7]. Severe thermo-mechanical property degradation of tungsten is expected as a result of the irradiation-induced defect accumulation [8] [9,10]. In turn, the degradation of these properties could impact plasma materials interactions (PMI), such as the bulk tritium retention, temperature-dependentmechanisms (e.g., chemical sputtering) impacted by the change of thermal conductivity.…”

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confidence: 99%

Irradiation hardening of pure tungsten exposed to neutron irradiation

Koyanagi

Fukuda

et al. 2016

Journal of Nuclear Materials

208

103

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Pure tungsten samples have been neutron irradiated in HFIR at 90~850°C to 0.03~2.2 dpa. A dispersed barrier hardening model informed by the available microstructure data has been used to predict the hardness. Comparison of the model predictions and the measured Vickers hardness reveals the dominant hardening contribution at various irradiation conditions. For tungsten samples irradiated in HFIR, the results indicate that voids and dislocation loops contributed to the hardness increase in the low dose region (< 0.3 dpa), while the formation of intermetallic second phase precipitation, resulting from transmutation, dominates the radiation-induced strengthening beginning with a relatively modest dose (> 0.6 dpa). The precipitate contribution is most pronounced for the HFIR irradiations, whereas the radiation-induced defect cluster microstructure can rationalize the entirety of the hardness increase observed in tungsten irradiated in the fast neutron spectrum of Joyo and the mixed neutron spectrum of JMTR.

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Effect of neutron irradiation on thermal diffusivity of tungsten–rhenium alloys

Cited by 88 publications

References 7 publications

Microstructure Development in Neutron Irradiated Tungsten Alloys

Microstructure Development in Neutron Irradiated Tungsten Alloys

Precipitation of Solid Transmutation Elements in Irradiated Tungsten Alloys

Irradiation hardening of pure tungsten exposed to neutron irradiation

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