Application of EBSD as a method for analyzing irradiation damage in ceramics

Fujimura, Yuki; Ishikawa, Norito; Kondo, Keietsu

JAEA-Technology 2024-012, 26 Pages, 2024/10

JAEA-Technology-2024-012.pdf:3.03MB

While ceramic materials exhibit high temperature strength and corrosion resistance, they are also chemically stable. Specifically, aluminum oxide (AlO) is recognized as one of the highly radiation resistant materials. On the other hand, the precise evaluation of irradiation damage in these materials poses a significant challenge because detecting radiation damage induced in highly radiation-resistant ceramics is difficult. The objective of this study is to evaluate irradiation-induced lattice strain using Electron BackScatter Diffraction (EBSD), a technique commonly employed for damage analysis in metals. Ion irradiation tests were conducted on AlO, a representative highly radiation-resistant ceramic, at various doses. Through lattice strain analysis using EBSD, we successfully identified irradiation-induced lattice strain in the direction parallel to the irradiation, consistent with previous XRD analysis results. Lattice strain in the direction perpendicular to the irradiation was also detected. It was observed that the lattice strain tends to increase with increasing irradiation damage. In conclusion, lattice strain analysis using EBSD proves to be an effective method for assessing the irradiation effects on ceramics.

Effect of hydrogenation conditions on the microstructure and mechanical properties of zirconium hydride

Muta, Hiroaki*; Nishikane, Ryoji*; Ando, Yusuke*; Matsunaga, Junji*; Sakamoto, Kan*; Harjo, S.; Kawasaki, Takuro; Oishi, Yuji*; Kurosaki, Ken*; Yamanaka, Shinsuke*

Journal of Nuclear Materials, 500, p.145 - 152, 2018/03

https://doi.org/10.1016/j.jnucmat.2017.12.027

Analysis of plastic deformation behavior at SCC crack tip by EBSP method

Kaji, Yoshiyuki; Miwa, Yukio; Tsukada, Takashi

Nihon Kikai Gakkai M&M 2005 Zairyo Rikigaku Kanfarensu Koen Rombunshu, p.175 - 176, 2005/12

From results of analysis of plastic deformation behavior at SCC crack tip by EBSP method, the conclusions was obtained as follows: (1)Regarding to basic data for quantitative evaluation of plastic deformation behavior at SCC crack tip, we obtained relationship between plastic deformation and misorientation of grain using SSRT result for SUS316L stainless steel in high temperature water and local plastic strain was able to estimate using this relationship. (2)From experimental results of plastic strain at SCC crack and ductile crack tips using relationship between misorientation and plastic deformation, plastic strain near ductile crack tip was larger than that at SCC crack tip. Plastic deformation region was, however, corresponded to region of about one grain at crack tip for both SCC and ductile cracks.

AFM evaluation of grain boundary corrosion behavior on ion irradiated stainless steel

Nemoto, Yoshiyuki; Miwa, Yukio; Tsukada, Takashi; Tsuji, Hirokazu

JAERI-Conf 2003-001, p.397 - 404, 2003/03

https://jopss.jaea.go.jp/pdfdata/JAERI-Conf-2003-001.pdf

It is essential to evaluate corrosion behavior at grain boundary of irradiated materials for mechanistic understanding of Irradiation assisted stress corrosion cracking (IASCC). However there is no suitable technique to evaluate grain boundary corrosion behavior of irradiated materials. The aim of this work is to develop the measurement method for the grain boundary corrosion behavior of irradiated materials using atomic force microscope (AFM). Ni ion was irradiated to solution annealed Fe-18Cr-12Ni alloy at about 573K. The peak damage level was estimated as 1 dpa. To study relationship of grain boundary character and corrosion behavior, orientation imaging microscope (OIM) observation was conducted. After potentiostatic corrosion procedure, the surface of the specimens were examined with AFM and OIM. Some of grain boundaries were corroded, and these were random coincidence grain boundaries. The depth of the corroded region at grain boundaries was successfully evaluated with AFM in nanometer scale.

Change in lattice spacing of sapphire single crystal irradiated with swift heavy ions

Ishikawa, Norito; Kondo, Keietsu; Fujimura, Yuki; Kitamura, Akane

no journal, , 

When ceramic materials are irradiated with swift heavy ions, radiation damages are created. In this study, AlO is irradiated with ions, and change in lattice spacing is analyzed for visualizing spatial mapping of the lattice change. As a result, the effect appeared near the boundary between irradiated are and unirradiated area, although the homogeneous irradiation is performed.

A Comparison between neutron diffraction and EBSD images for a TlBr crystal

Watanabe, Kenichi*; Hitomi, Keitaro*; Nogami, Mitsuhiro*; Maeda, Shigetaka; Ito, Chikara; Tanno, Takashi; Onabe, Hideaki*

no journal, , 

TlBr is a compound semiconductor with a high atomic number, high density and a wide bandgap, and is being developed as a gamma-ray detector material that can be operated at room temperature and has high detection efficiency. There is neutron diffraction in order to establish a crystal quality evaluation method for improving the yield in device fabrication, but the facilities that can be implemented are limited to large facilities such as J-PARC. The Electron Backscatter Diffraction (EBSD) image, which is one of the electron beam diffractions, can be obtained with an electron microscope, but only the information on the crystal surface can be obtained. In this study, the crystal orientation image was acquired for the TlBr crystal by neutron Bragg dip imaging, which is one of the neutron diffractions, and EBSD. By comparing both images, the applicability to a simple EBSD crystal quality evaluation method was examined.