TEM study of impurity segregations in beryllium pebbles

Klimenkov, M.; Chakin, V.; Moeslang, A.; Rolli, R.

doi:10.1016/j.jnucmat.2014.08.030

Cited by 10 publications

(7 citation statements)

References 16 publications

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“…Segregations of Al-Fe-Be phase to dislocation lines were observed in this work (marked with arrows in Fig. 10b) as well as previously 35 .…”

Section: Second Phase Precipitates and Segregation After Irradiationsupporting

confidence: 92%

“…www.nature.com/scientificreports www.nature.com/scientificreports/ previous publications 19,34 suggest that these complex structures are beryllium intermetallic compounds. The post irradiation examination of HIDOBE1 campaign also confirmed the presence of complex beryllide particles with Fe/Al/Mn or Fe/Al/Mn/Cr composition 35 . It was found that the particles were located along the line dislocations.…”

Section: Second Phase Precipitates and Segregation After Irradiationmentioning

confidence: 65%

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New insights into microstructure of irradiated beryllium based on experiments and computer simulations

Klimenkov

Vladimirov

Jäntsch

et al. 2020

Sci Rep

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The microstructural response of beryllium after neutron irradiation at various temperatures (643-923 K) was systematically studied using analytical transmission electron microscope that together with outcomes from advanced atomistic modelling provides new insights in the mechanisms of microstructural changes in this material. The most prominent feature of microstructural modification is the formation of gas bubbles, which is revealed at all studied irradiation temperatures. except for the lowest irradiation temperature, gas bubbles have the shape of thin hexagonal prisms with average height and diameter increasing with temperature. A high number density of small bubbles is observed within grains, while significantly larger bubbles are formed along high-angle grain boundaries (GB). Denuded zones (DZ) nearly free from bubbles are found along both high-and low-angle grain boundaries. Precipitations of secondary phases (mainly intermetallic Al-Fe-Be) were observed inside grains, along dislocation lines and at GBs. EDX analysis has revealed homogeneous segregation of chromium and iron along GBs. the observed features are discussed with respect to the available atomistic modelling results. in particular, we present a plausible reasoning for the abundant formation of gas bubbles on intermetallic precipitates, observation of various thickness of zones denuded in gas bubbles and precipitates, and their relation to the atomic scale diffusion mechanisms of solute-vacancy clusters.

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“…Segregations of Al-Fe-Be phase to dislocation lines were observed in this work (marked with arrows in Fig. 10b) as well as previously 35 .…”

Section: Second Phase Precipitates and Segregation After Irradiationsupporting

confidence: 92%

Section: Second Phase Precipitates and Segregation After Irradiationmentioning

confidence: 65%

New insights into microstructure of irradiated beryllium based on experiments and computer simulations

Klimenkov

Vladimirov

Jäntsch

et al. 2020

Sci Rep

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“…This has led to a damage of up to 34 dpa and a gas production of 5524 appm He and 596 appm 3 H. The HIDOBE-02 campaign is the continuation of the HIDOBE-01 program in which approximately half of the helium and tritium production was achieved. [11] Results of the microstructural investigations of the HIDOBE-01 samples can be found in [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of a high-dose irradiated beryllium microstructure

Zimber

Vladimirov

Klimenkov

et al. 2020

Journal of Nuclear Materials

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“…by analytical transmission electron microscopy. The main focus of the previous TEM studies was on the characterization of the bubbles, determination of their shapes, dimensions and number density as well as evaluation of the microscopic swelling (Klimenkov et al, 2013a(Klimenkov et al, , 2014Rabaglino et al, 2003). In Refs.…”

mentioning

confidence: 99%

“…In Refs. (Klimenkov et al, 2013a(Klimenkov et al, , 2014, it was reported that gas bubbles have a hexagonal coin like shape whose diameter and thickness strongly depend on the irradiation temperature. Neutron ir radiation at 648 K leads to the formation of bubbles with a diameter of typically 10 nm.…”

mentioning

confidence: 99%