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- W2022995304 abstract "Boron carbide is one of the current candidate materials for neutron absorbers in the control systems of various nuclear reactors because of its high neutron absorption cross-section over a broad spectrum of neutron energies. It is also one of the prime candidate materials for the first wall coating in fusion reactors because its low Z constituent atoms would lead to minimum plasma contamination. On the basis of this premise, a number of irradiation experiments have been carried out on boron carbide. Transmission electron microscope (TEM) observations of neutron irradiated boron carbide have revealed small disk-shaped cavities on /111/ and sometimes on /110/ and /100/ rhombohedral planes. These cavities have been identified as high-pressure He bubbles, since they are accompanied by surrounding strain fields. With increasing irradiation temperature, the size of these bubbles increases, while their density decreases. He bubbles induced by 100 keV He ion irradiation, on the other hand, were reported to have a spherical shape. Recently, it was established by the authors' group that a number of intermetallic compounds could be rendered amorphous by high energy electron irradiation as they could be by ion irradiation. This phenomenon is of interest not only from an engineering point of viewmore » but also from a scientific perspective to clarify the mechanism of the crystalline to amorphous (C-A) transition. As an extension of the work on the intermetallics, a systematic study of the electron irradiation induced C-A transition in ceramic materials was undertaken by the authors with some preliminary results showing the presence of an electron irradiation induced C-A transition in SiC. In the present paper, it is reported that boron carbide undergoes a C-A transition by electron irradiation at 2 MV, whereas BETA-rhombohedral boron remains crystalline during the irradiation.« less" @default.
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- W2022995304 date "1988-01-01" @default.
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- W2022995304 title "Electron irradiation induced crystalline to amorphous transition in boron carbide" @default.
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