The cold-rolling behaviour of AZ31 tubes for fabrication of biodegradable stents

Yaowu Zhang; Damon Kent; Gui Wang; David St John; Matthew Dargusch

doi:10.1016/j.jmbbm.2014.07.026

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The cold-rolling behaviour of AZ31 tubes for fabrication of biodegradable stents

Journal article

Open access

Peer reviewed

The cold-rolling behaviour of AZ31 tubes for fabrication of biodegradable stents

Yaowu Zhang, Damon Kent, Gui Wang, David St John and Matthew Dargusch

Journal of the Mechanical Behavior of Biomedical Materials, Vol.39, pp.292-303

2014

DOI: https://doi.org/10.1016/j.jmbbm.2014.07.026

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Abstract

Biomedical Engineering

Materials Engineering

Mechanical Engineering

AZ31 tubes

processing

cold rolling

mechanical behaviour

twinning

Mg alloys are receiving considerable attention for biomedical stents due to their combination of good mechanical properties and high biodegradability. Cold rolling is necessary to process Mg alloy tubes before final drawing and fabrication of the magnesium stents. In this paper, cold-rolled tubes were subjected to a cross-sectional reduction rate (Îµ) of up to 19.7%, and were further processed at various ratios of wall-thickness to diameter reduction (Q) from 0 to 2.24 with a constant Îµ of 19.7%. The results show that the cold-rolled tubes exhibited a rise in ultimate tensile strength (UTS), yield strength (YS), and a reduction in elongation as Îµ increased from 5.5% to 19.7%. UTS, YS and elongation decreased when Q was increased from 0 to 2.24. Mechanical twinning was observed and analysed. Extension twins increased with increasing Îµ and were almost saturated at a Îµ of 16.5%. Extension twins play an important role in determining the evolution of mechanical behaviour in the case of increasing Îµ, whilst contraction/double twins and secondary extension twins have a large effect on mechanical behaviour in the case of varying Q. The results indicate that the proportions and types of twins play a major role in determining the mechanical behaviour of the AZ31 tubes.

Details

Title: The cold-rolling behaviour of AZ31 tubes for fabrication of biodegradable stents
Authors: Yaowu Zhang (Author) - University of Queensland
Damon Kent (Author) - University of Queensland
Gui Wang (Author) - University of Queensland
David St John (Author) - University of Queensland
Matthew Dargusch (Author) - University of Queensland
Publication details: Journal of the Mechanical Behavior of Biomedical Materials, Vol.39, pp.292-303
Publisher: Elsevier Ltd.
Date published: 2014
DOI: 10.1016/j.jmbbm.2014.07.026
ISSN: 1751-6161
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99449084102621
Output Type: Journal article

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Web Of Science research areas: Engineering, Biomedical; Materials Science, Biomaterials