title: In situ heating SEM observation of the bainitic transformation process in Cu-17Al-11Mn (at.%) alloys.
abstract: To understand the bainitic transformation behavior in Cu-17Al-11Mn (at.%) alloys, dynamicin situobservation during heating was carried out in a scanning electron microscope (SEM). In this study, after optimizing the sample preparation method and observation conditions, we successfully observed the transformation process with sufficient resolution and contrast. From the observation results, bainite is first formed preferentially at the grain boundaries of the parent phase. Bainite is also formed inside the grains to relax the elastic strain generated by the initial bainite. Regarding the growth mode, in the early stage of the transformation, bainite grows along the longitudinal direction, and in the late stage, it grows along the lateral direction. The growth rate of the bainite was also evaluated by continuous observation of the same plate. Dynamicin situobservation of a martensitic transformation in the same alloy was also performed to compare the growth mode with that of bainite, and it was found that the behavior is considerably different between bainitic and the martensitic transformations.
authors.affiliation: Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan motomura.shunichi@nims.go.jp.
authors.forename: Shunichi
authors.initials: S
authors.lastname: Motomura
authors.affiliation: Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Soejima
authors.affiliation: Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Miyoshi
authors.affiliation: Surface Physics and Structure Unit, Advanced Key Technologies Division, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan Faculty of Engineering Science, Department of Engineering Science for Electronics and Materials, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Hara
authors.affiliation: Department of Metallurgy, Materials Science and Materials Processing, Graduate School of Engineering, Tohoku University, Aoba-yama 02, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Omori
authors.affiliation: Department of Metallurgy, Materials Science and Materials Processing, Graduate School of Engineering, Tohoku University, Aoba-yama 02, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Kainuma
authors.affiliation: Faculty of Engineering Science, Department of Engineering Science for Electronics and Materials, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Nishida
keywords: Ar ion milling; Cu–Al–Mn alloy; bainitic transformation; in situ electron microscopy; martensitic transformation; scanning electron microscopy