The competing effects of temperature and neutron irradiation on the microstructure and mechanical properties of ITER grade tungsten

Papadakis, Dimitrios; Dellis, Spilios; Mergia, K.; Chatzikos, V.; Terentyev, D.; Bonny, G.; Dubinko, A.; Renterghem, W. Van; Konstantinović, M.J.; Messoloras, S.; Pintsuk, G.

doi:10.1016/j.fusengdes.2021.112608

Cited by 15 publications

(7 citation statements)

References 65 publications

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“…The production route of the W polycrystalline (sheet and bar) materials used in the current study and their reference microstructure are presented in [17][18][19][20]. The cold rolled sheet and forged bar, with a purity of higher than 99.97 wt%, were produced by PLANSEE SE.…”

Section: Materials and Irradiationmentioning

confidence: 99%

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Neutron irradiation effects in different tungsten microstructures

et al. 2021

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In this work the correlation of the neutron radiation damage and tungsten (W) microstructure is investigated. Further, the modification of the structure as a result of the neutron irradiation is assessed and its effect on the mechanical properties is determined. Forged bar (ITER grade), cold rolled sheet, and single crystalline tungsten materials were neutron irradiated at 600 °C to a damage of 0.12 displacements per atom. Neutron irradiation results in the formation of voids of almost the same size (larger than 1 nm) and dislocations detected by positron annihilation lifetime spectroscopy. All W grades have similar total dislocation densities, in the range of (1.6-2.4)×10 14 m −2 , as determined by electrical resistivity measurements. After irradiation the hardness of all tungsten grades increases and the largest increase is that of the single crystal (47%), whereas the smallest that of the sheet (13%). Increase in the yield strength, correlated to the increase of the hardness, is also found. The largest increase is observed for the single crystal (25%) and the smallest for the sheet (6%). The different degrees of hardening and strengthening indicate that the microstructure of the different tungsten grades has a significant influence on their neutron radiation damage resistance.

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Section: Materials and Irradiationmentioning

confidence: 99%

“…The W(100) single crystal (SC) of 99.999% purity was supplied by MaTeck. Disks with a diameter of about 11 mm were sectioned from the three W materials and were polished to obtain mirror quality surface as described in [19]. The final thickness of the samples was about 0.5 mm.…”

Section: Materials and Irradiationmentioning

confidence: 99%

Neutron irradiation effects in different tungsten microstructures

et al. 2021

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“…It is noted that irradiation and annealing, as already mentioned in 3.1.1, have a competing role in the microstructure and as a result in the mechanical properties of the material. The competing effect of annealing and radiation damage on the elastic properties is investigated in [87] on ITER grade W, which is less heavily deformed in the as fabricated condition compared to the material of the current work.…”

Section: Elastic Propertiesmentioning

confidence: 99%

Evolution of microstructure in neutron irradiated cold rolled tungsten and its correlation with hardness

Mergia

Chatzikos

Manios

et al. 2021

Fusion Engineering and Design

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“…The results, including reported data [23,41,42], are depicted in Figure 16. Section 3.1 of our study yielded a migration energy of 0.11 eV.…”

Section: Rate Theory Calculation For Wmentioning

confidence: 99%

“…Gray symbols mean reported densities and sizes of TEM-observed defects in references (data from Refs. [23,41,42]).…”

Section: Rate Theory Calculation For Wmentioning

confidence: 99%

Evolution of Irradiation Defects in W and W-Re Systems: A Density Functional Theory and Rate Theory Study

Xin,

Yang,

Wang

et al. 2023

Metals

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In a fusion environment, tungsten, a plasma-facing material in a reactor, is subject to the irradiation of high-energy neutrons, generating a large amount of displacement damage and transmutation products (such as rhenium, Re). We studied the evolution of defects under irradiation in W and W-Re systems using the density functional theory (DFT) and rate theory (RT) method. The results indicate that the evolution of irradiation defects is mainly affected by the irradiation dose, dose rate, and temperature. During irradiation, loops form first in W, followed by the generation of voids, which are due to the different migration energies of point defects. Higher dose rates result in a higher density and larger size of defects in tungsten. Higher temperatures cause a decrease in void density and an increase in size. The results obtained at 600 °C were in good agreement with the reported TEM data. In W-Re alloys, it is indicated that the formation of loops is delayed because Re suppresses the nucleation of loops. The dynamic introduction of Re in W stabilizes the growth of defects compared to W-Re alloys, suggesting that transmuting elements have less detrimental effects on irradiation than alloying. As defect densities and sizes were quantified under different irradiation conditions, the results provide data for the multi-scale simulation of the radiation damage and thermal/mechanical properties in plasma-facing materials under fusion conditions.

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The competing effects of temperature and neutron irradiation on the microstructure and mechanical properties of ITER grade tungsten

Cited by 15 publications

References 65 publications

Neutron irradiation effects in different tungsten microstructures

Neutron irradiation effects in different tungsten microstructures

Evolution of microstructure in neutron irradiated cold rolled tungsten and its correlation with hardness

Evolution of Irradiation Defects in W and W-Re Systems: A Density Functional Theory and Rate Theory Study

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