Effects of phase constitution of Zr-Nb alloys on their magnetic susceptibilities

Naoyuki Nomura, Yuko Tanaka, Suyalatu, Ryota Kondo, Hisashi Doi, Yusuke Tsutsumi, Takao Hanawa

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72 Citations (Scopus)


The magnetic susceptibilities and microstnictures of Zr-Nb binary alloys were investigated to develop a new metallic biomaterial with a low magnetic susceptibility for magnetic resonance imaging (MRI). The magnetic susceptibility was measured with a magnetic susceptibility balance, and the microstructure was evaluated with an X-ray diffractometer (XRD), an optical microscope (OM), and a transmission electron microscope (TEM). Zr-Nb alloys as-cast showed a minimum value of magnetic susceptibility between 3 and 9 mass% Nb, and the value abruptly increased up to 20 mass% Nb, followed by a gradual increase with the increase of the Nb content. XRD, OM, and TEM revealed that the minimum value of the susceptibility was closely related to the appearance of the athermal ω phase in the β phase. Since the magnetic susceptibility of Zr-3Nb alloy consisting of an α′ phase was as low as that of Zr-9Nb alloy consisting of the β and ω phases, that of the ω phase was lower than that of the α′ and β phases. When Zr-16Nb alloy was heat-treated, the isothermal ω phase appeared, and, simultaneously, the magnetic susceptibility decreased. Therefore, the ω phase contributes to the decrease of the magnetic susceptibility, independently of the formation process of the ω phase. The magnetic susceptibility of the Zr-3Nb alloy as-cast was almost one-third that of Ti-6A1-4V alloy, which is commonly used for medical implant devices. Zr-Nb alloys are useful for medical devices used under MRI.

Original languageEnglish
Pages (from-to)2466-2472
Number of pages7
JournalMaterials Transactions
Issue number10
Publication statusPublished - 2009 Oct


  • ω
  • Magnetic resonance imaging (MRI)
  • Magnetic susceptibility
  • Phase
  • Phase constitution
  • Zirconium-niobium alloy


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