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Metals 2018, 8(6), 454; https://doi.org/10.3390/met8060454

Effects of Cold Swaging on Mechanical Properties and Magnetic Susceptibility of the Zr–1Mo Alloy

1
Department of Metallic Biomaterials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo 101-0062, Japan
2
Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
3
Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
*
Author to whom correspondence should be addressed.
Received: 20 April 2018 / Revised: 23 May 2018 / Accepted: 12 June 2018 / Published: 13 June 2018
(This article belongs to the Special Issue Zirconium Alloys)
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Abstract

Zr alloy is expected to decrease the artifact volume of magnetic resonance imaging (MRI) due to its relatively small magnetic susceptibility. To improve the mechanical properties of a Zr–1mass%Mo alloy that yielded a reduced artifact volume during MRI, the alloy was melted, hot-forged, and cold-swaged with area reduction ratios of 30%, 50%, 60%, 70%, and 84%. The effects of cold swaging on the microstructure, mechanical properties, and magnetic susceptibility of the alloy were investigated. Before cold swaging, the microstructure consisted of laminated and layered α- and β-phases; however, after cold swaging, the α- and β-phases were bent and distorted, and the α-phase became oriented along the {10 1¯ 0} plane. The ultimate tensile strength and elongation to fracture of the Zr–1Mo alloy after cold swaging with an 84% area reduction were 1001 MPa and 10.7%, respectively. The alloy only experienced work-hardening when subjected to large deformations. On the other hand, the change in magnetic susceptibility with cold-swaging was small, from 13.85 × 10−9 to 14.87 × 10−9 m3·kg−1. Thus, a good balance of mechanical properties and low magnetic susceptibility in the Zr–1Mo alloy was obtained by cold swaging. Therefore, this alloy is suitable for utilization in medical devices and is expected to decrease the artifact volume. View Full-Text
Keywords: Zr–1Mo alloy; cold swaging; microstructure; mechanical properties; magnetic susceptibility Zr–1Mo alloy; cold swaging; microstructure; mechanical properties; magnetic susceptibility
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Ashida, M.; Morita, M.; Tsutsumi, Y.; Nomura, N.; Doi, H.; Chen, P.; Hanawa, T. Effects of Cold Swaging on Mechanical Properties and Magnetic Susceptibility of the Zr–1Mo Alloy. Metals 2018, 8, 454.

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