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Microstructure and mechanical properties of as-cast Zr–Nb alloys

Paper ID Volume ID Publish Year Pages File Format Full-Text
686 57 2011 7 PDF Available
Title
Microstructure and mechanical properties of as-cast Zr–Nb alloys
Abstract

On the basis of the microstructures and mechanical properties of as-cast Zr–(0–24)Nb alloys the effects of phase constitution on the mechanical properties and magnetic susceptibility are discussed in order to develop Zr alloys for use in magnetic resonance imaging (MRI). The microstructures were evaluated using an X-ray diffractometer, an optical microscope, and a transmission electron microscope; the mechanical properties were evaluated by a tensile test. The α′ phase was dominantly formed with less than 6 mass% Nb content. The ω phase was formed in Zr–(6–20)Nb alloys, but disappeared from Zr–22Nb. The β phase dominantly existed in Zr–(9–24)Nb alloys. The mechanical properties as well as the magnetic susceptibility of the Zr–Nb alloys varied depending on the phase constitution. The Zr–Nb alloys consisting of mainly α′ phase showed high strength, moderate ductility, and a high Young’s modulus, retaining low magnetic susceptibility. Zr–Nb alloys containing a larger volume of ω phase were found to be brittle and, thus, should be avoided, despite their low magnetic susceptibility. When the Zr–Nb alloys consisted primarily of β phase the effect of ω phase weakened the mechanical properties, thereby leading to an increase in ductility, even with an increase in magnetic susceptibility. The minimum value of Young’s modulus was obtained for Zr–20Nb, because this composition was the phase boundary between the β and ω phases. However, the magnetic susceptibility of the alloy was half that of Ti–6Al–4V alloys. Zr–Nb alloys consisting of α′ or β phase have excellent mechanical properties with low magnetic susceptibility and, thus, these alloys could be useful for medical devices used in MRI.

Keywords
Zr–Nb alloy; Microstructure; Phase constitution; Mechanical properties; Magnetic susceptibility
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Microstructure and mechanical properties of as-cast Zr–Nb alloys
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 7, Issue 12, December 2011, Pages 4278–4284
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us