Crystallite size measurement in standard samples using neutron bragg edge imaging

Su, Y. H.  ; Lau, W. S.*; 篠原 武尚   ; Parker, J. D.*; 及川 健一   ; 甲斐 哲也   ; 土川 雄介 ; 林田 洋寿*; 松本 吉弘*; Gao, S.*; Mao, W.; Gong, W.   ; Harjo, S.   ; 佐藤 博隆*; 鬼柳 善明*

Su, Y. H.; Lau, W. S.*; Shinohara, Takenao; Parker, J. D.*; Oikawa, Kenichi; Kai, Tetsuya; Tsuchikawa, Yusuke; Hayashida, Hirotoshi*; Matsumoto, Yoshihiro*; Gao, S.*; Mao, W.; Gong, W.; Harjo, S.; Sato, Hirotaka*; Kiyanagi, Yoshiaki*

Crystallite size is a crucial parameter in characterising the structural properties of materials, and accurate measurement techniques are essential for various applications in engineering materials science. The neutron Bragg edge imaging method offers a non-destructive and penetrating approach to measure crystallite size of each crystalline phase within a bulk material. Electron Backscatter Diffraction (EBSD) is a popular technique for determining grain sizes and orientations in crystalline materials. This experiment aimed to demonstrate the effectiveness of neutron Bragg edge imaging as a complementary technique to EBSD for grain size characterisation in crystalline materials. We conducted experiments using standard samples with known grain sizes from the EBSD measurements. Two materials were used in the study: pure iron with a ferrite phase and an Fe-24Ni-0.3C alloy with an austenite phase. The time-of-flight neutron transmission imaging experiment was performed at BL22 RADEN in J-PARC MLF. By analysing the obtained Bragg-edge spectra, we were able to obtain information regarding the crystallite size and texture of the samples. To validate the results, a comparison was made using data from both EBSD observations and neutron diffraction measurements from BL19 TAKUMI in J-PARC MLF.