Effects of neutron irradiation on physical and mechanical properties of Mo-Re alloys

Fabritsiev, S.A.; Gosudarenkova, V.A.; Potapova, V. A.; Рыбин, В. В.; Kosachev, L.S.; Chakin, V.; Pokrovsky, A.S.; Barabash, V.

doi:10.1016/s0022-3115(09)80080-9

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…[1][2][3][4][5][6]. To improve the mechanical properties at high temperatures, rhenium (Re) addition to Mo and W was proposed [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural development and radiation hardening of neutron irradiated Mo–Re alloys

Nemoto

Hasegawa

Satou

et al. 2004

Journal of Nuclear Materials

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“…[1][2][3][4][5][6]. To improve the mechanical properties at high temperatures, rhenium (Re) addition to Mo and W was proposed [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…[6,[16][17][18]. Hasegawa et al studied about radiation embrittlement of Mo, Mo-5Re and Mo-41Re [17,18], and reported drastic embrittlement of Mo-41Re after neutron irradiation.…”

Section: Introductionmentioning

confidence: 99%

Microstructural development and radiation hardening of neutron irradiated Mo–Re alloys

Nemoto

Hasegawa

Satou

et al. 2004

Journal of Nuclear Materials

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“…This problem may be only of academic interest, however, since one consequence of such segregation is a strong embrittlement that probably disqualifies MoRe alloys for most uses in nuclear systems. For instance, studies by Gorynin et al [8] and Fabritsiev et al [9] have shown that relatively low levels of irradiation in the SM-2 mixed spectrum reactor lead to a severe embrittlement and also to a strong loss of electrical conductivity in a wide range of Mo-Re alloys. Hasegawa et al showed that, after irradiation of Mo-5Re in FFTF to 7-34dpa, it was possible to see the encroaching impact of radiation-induced precipitation on ductility even at that low level of Re [lo].…”

Section: Mo-re Alloysmentioning

confidence: 99%

Neutron irradiation effects in fusion or spallation structural materials: Some recent insights related to neutron spectra

Garner

Greenwood

1998

Radiation Effects and Defects in Solids

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A review is presented of recent insights on the role of transmutation in the development of radiation-induced changes in dimension or radiation-induced changes in physical or mechanical properties. It is shown that, in some materials and some neutron spectra, transmutation can significantly affect or even dominate a given property change process. When the process under study is also sensitive to displacement rate, and especially if it involves radiation-induced segregation and precipitation, it becomes much more difficult to separate the transmutation and displacement rate dependencies. This complicates the application of data derived from "surrogate" spectra to predictions in other flux-spectra environments. It is also shown in this paper that one must be sensitive to the impact of previously-ignored "small" variations in neutron spectra within a given reactor. In some materials these small variations have major consequences.

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“…Aside from a straight replacement for W, Mo has also been used as an interlayer between W and base carbon tiles in JET as part of the ITER-like wall project [7,8] because it has a good match with the thermal expansion coefficients of both W and C [6]. Mo and its alloys, particularly with rhenium (Re), also have a high strength and resistance to radiation swelling [9], and were once widely considered for the heat-sink of early divertor concepts for ITER (for example, see [9,10]).…”

Section: Introduction: Molybdenum As a Fusion Materialsmentioning

confidence: 99%

Experimental validation of inventory simulations on molybdenum and its isotopes for fusion applications

2020

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Molybdenum is a potential material for future nuclear fusion experiments and power plants. It has good thermo-mechanical properties and can be readily fabricated, making it attractive as an alternative material to tungsten (the current leading candidate) for high neutron flux and high thermal load regions of fusion devices. Unfortunately, exposure to fusion neutrons is predicted to cause significant radioactivity in elemental Mo for decades and centuries after exposure, which would be a problem during maintenance and decommissioning operations. Simulation predictions indicate that Mo activation could be reduced by isotopic adjustment (biasing). If these predictions are proven and validated, and if isotopic adjustment is technically and economically feasible, then Mo could be used in future demonstration and commercial reactors without significantly increasing the amount of long-term, higher-level radioactive waste. Transmutation (inventory) simulations used to predict activation rely on nuclear reaction data. The quality of these data impact on the confidence and uncertainty associated with predictions. Recently, UKAEA has developed benchmarks to test and validate the FISPACT-II inventory code and the input nuclear data libraries. Verification of molybdenum inventory simulations is performed against experimental decay-heat measurements from JAEA’s fusion neutron source (FNS) facility and using new data acquired from γ-spectroscopy measurements of Mo irradiated in the ASP 14 MeV facility in the UK. Results demonstrate that FISPACT-II predictions (with TENDL-2019 nuclear data) for Mo are accurate on the short-timescales (minutes, hours of irradiation and minutes, days, weeks of cooling) of these laboratory experiments. However, these kinds of experiments are limited in their coverage of the important radionuclides for decay radiation from Mo on the years, decades and beyond timescales. Further experiments with fusion relevant conditions and timescales, potentially with alternative measurement techniques, are still needed.

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Effects of neutron irradiation on physical and mechanical properties of Mo-Re alloys

Cited by 5 publications

References 2 publications

Microstructural development and radiation hardening of neutron irradiated Mo–Re alloys

Microstructural development and radiation hardening of neutron irradiated Mo–Re alloys

Neutron irradiation effects in fusion or spallation structural materials: Some recent insights related to neutron spectra

Experimental validation of inventory simulations on molybdenum and its isotopes for fusion applications

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