title: Three-dimensional characterization of ODS ferritic steel using by FIB-SEM serial sectioning method.
abstract: Considerable attention has been paid to the research of the electron tomography due to determine the three-dimensional (3D) structure of materials [1]. One of the electron tomography techniques, focused ion beam/scanning electron microscopy (FIB-SEM) imaging has advantages of high resolutions (10 nm), large area observation (μm order) and simultaneous energy dispersive x- ray microanalysis (EDS)/ electron backscatter diffraction (EBSD) analysis. The purpose of this study, three-dimensional EBSD analysis of ODS ferritic steel which carried out cold work using FIB-SEM equipment was conducted, and it aimed at analyzing the microstructure obtained there. The zone annealing tests were conducted for ferritic steel [2,3], which were produced through mechanical alloying and hot-extrusion. After zone annealing, specimens were mechanically polished with #400∼4000 emery paper, 1 µm diamond paste and alumina colloidal silica. The serial sectioning and the 3D-electron backscattering diffraction (3D-EBSD) analysis were carried out. We made the micro pillar (30 x 30 x 15 µm). The EBSD measurements were carried out in each layer after serial sectioning at a step size and milling depth was 80 nm with 30 slices. After EBSD analysis, the series of cross-sectional images were aligned according to arbitrarily specified areas and then stacked up to form a volume. Consequently, we obtained the 3D-IPF maps for ODS ferritic steel. In this specimen, the {111} and {001} grains are layered by turns. In addition, the volume fraction value of both plane are similar. The aspect ratio increases with specimen depth. The 3D-EBSD mapping is useful to analysis of the bulk material since this method obtain many microstructure information, such a shape, volume and orientation of the crystal, grain boundary.
authors.affiliation: Dept. of Materials Science, Faculty of Engineering, Hokkaido University kita 13, Nishi 8, Kitaku, Sapporo, Hokkaido, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Endo
authors.affiliation: Dept. of Materials Science, Faculty of Engineering, Hokkaido University kita 13, Nishi 8, Kitaku, Sapporo, Hokkaido, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Sugino
authors.affiliation: Dept. of Materials Science, Faculty of Engineering, Hokkaido University kita 13, Nishi 8, Kitaku, Sapporo, Hokkaido, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Ohono
authors.affiliation: Dept. of Materials Science, Faculty of Engineering, Hokkaido University kita 13, Nishi 8, Kitaku, Sapporo, Hokkaido, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ukai
authors.affiliation: Dept. of Materials Science, Faculty of Engineering, Hokkaido University kita 13, Nishi 8, Kitaku, Sapporo, Hokkaido, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Miyazaki
authors.affiliation: Dept. of Materials Science, Faculty of Engineering, Hokkaido University kita 13, Nishi 8, Kitaku, Sapporo, Hokkaido, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Dept. of Materials Science, Faculty of Engineering, Hokkaido University kita 13, Nishi 8, Kitaku, Sapporo, Hokkaido, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ohnuki