title: Contactless electrical conductivity measurement of metallic submicron-grain material: Application to the study of aluminum with severe plastic deformation.
abstract: We measured the electrical conductivity σ of aluminum specimen consisting of submicron-grains by observing the AC magnetic susceptibility resulting from the eddy current. By using a commercial platform for magnetic measurement, contactless measurement of the relative electrical conductivity σn of a nonmagnetic metal is possible over a wide temperature (T) range. By referring to σ at room temperature, obtained by the four-terminal method, σn(T) was transformed into σ(T). This approach is useful for cylinder specimens, in which the estimation of the radius and/or volume is difficult. An experiment in which aluminum underwent accumulative roll bonding, which is a severe plastic deformation process, validated this method of evaluating σ as a function of the fraction of high-angle grain boundaries.
authors.affiliation: Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Mito
authors.affiliation: Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Matsui
authors.affiliation: Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yoshida
authors.affiliation: Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Anami
authors.affiliation: Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Tsuruta
authors.affiliation: Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Deguchi
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Iwamoto
authors.affiliation: Faculty of Engineering, Chiba Institute of Technology, Narashino 275-0016, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Terada
authors.affiliation: School of Materials and Chemical Technology, Tokyo Institute of Technology, Yokohama 226-8502, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Miyajima
authors.affiliation: Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Tsuji