title: Effect of cold rolling on the magnetic susceptibility of Zr-14Nb alloy.
abstract: The magnetic susceptibility of cold-rolled Zr-14Nb was evaluated to apply a new metallic medical device used for magnetic resonance imaging (MRI). The magnetic susceptibility of cold-rolled Zr-14Nb decreased up to the reduction ratio of 30%, then gradually decreased up to the ratio of 90%. Transmission electron microscopic observation revealed the strain-induced formation of ω phase after cold rolling at the reduction ratio of 5%, indicating that the initial decrease in magnetic susceptibility was caused by the formation of the ω phase. The ω phase was saturated at the reduction ratio of 30%. The formation of the ω phase could be explained on the basis of the increase in the Young's modulus and Vickers hardness of cold-rolled Zr-14Nb. The effect of texture formation on these properties was not obvious in the cold-rolled Zr-14Nb. Because of the strain-induced formation of the ω phase, the magnetic susceptibility of Zr-14Nb can be reduced by cold rolling to as low as that of as-cast Zr-9Nb, which is one-third that of Ti and Ti alloys. Therefore, cold-workable Zr-14Nb with low magnetic susceptibility could be a promising alloy for medical devices under MRI.
authors.affiliation: Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
authors.forename: Ryota
authors.initials: R
authors.lastname: Kondo
authors.forename: Ryota
authors.initials: R
authors.lastname: Shimizu
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Nomura
authors.forename: Hisashi
authors.initials: H
authors.lastname: Doi
authors.lastname: Suyalatu
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Tsutsumi
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Mitsuishi
authors.forename: Masayuki
authors.initials: M
authors.lastname: Shimojo
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Noda
authors.forename: Takao
authors.initials: T
authors.lastname: Hanawa
mesh_terms: D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry; D003080:Cold Temperature; D055119:Elastic Modulus; D006244:Hardness; D060328:Magnetic Phenomena; D046529:Microscopy, Electron, Transmission; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D001672:Biocompatible Materials