Effect of Ta content on the magnetic susceptibility of Zr–Ta binary alloys preventing artefacts for MRI

Akane Takaku Tsuno, Yuta Tanaka, Ryota Kondo, Naoyuki Nomura, Yusuke Tsutsumi, Takao Hanawa

研究成果: Article査読

3 被引用数 (Scopus)


The microstructures and magnetic properties of Zr–Ta binary alloys were examined in the study presented here. The Zr–Ta alloys (Zr-(0–50) mass% Ta) were prepared from 99.5 mass% zirconium and 99.5 mass% tantalum by arc melting in an Ar atmosphere. Magnetic susceptibility was evaluated in air at room temperature. The phase constitutions were identified using an X-ray diffractometer (XRD), a scanning electron microscope (SEM), and a transmission electron microscope (TEM). The acicular martensitic phase formed mainly in the lower Ta composition. In Zr-25Ta and above, the volume fraction of the β-Ta phase increased as Ta concentrations increased. TEM observations showed phase separation due to spinodal decomposition in Zr-20Ta and 30Ta. The diffraction patterns for Zr-20Ta showed spots associated with the ω phase. Magnetic susceptibility gradually declined as Ta was added, falling to a minimum twice: near Zr-20Ta and 50Ta. The former minimum resulted from the high volume fraction of the ω phase having lower magnetic susceptibility than that of other phases. The latter resulted from the formation of the β-Ta phase with magnetic susceptibility lower than the β-Zr phase. As a result, Zr–Ta alloys showed about three times lower magnetic susceptibility than Ti alloys and would be suitable for use with medical devices in MRI environments.

ジャーナルAdvances in Materials and Processing Technologies
出版ステータスPublished - 2016 10月 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 産業および生産工学
  • 材料力学


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