Processing and properties of magnesium alloy micro-tubes for biodegradable vascular stents

Materials Science & Engineering. C, Materials for Biological Applications
Jianfeng WangShaokang Guan

Abstract

Magnesium alloys are considered to be one of the most promising stent materials due to their good biological compatibility and biodegradable properties. However, the poor workability at room temperature restricts the processing of high-precision micro-tubes for the application as stent materials. In this study, Mg-Zn-Y-Nd alloy tube blank was firstly produced through hot extrusion. By multi-pass cold drawing combining with interpass annealing, the extruded tube blank can be processed into high-precision micro-tube with an outer diameter of about 2.0 mm and a wall thickness of about 0.15 mm. The drawn micro-tube after annealing exhibits improved mechanical properties with an ultimate tensile strength of about 298 MPa and a large breaking elongation of up to 20%. Meanwhile, the micro-tube shows good corrosion resistance with a trend of uniform corrosion in simulated body fluid solution. The investigation revealed that a significant improvement in the mechanical properties is mainly attributed to grain refinement and texture weaken, while the good biodegradable properties is related with the low density of crystallographic defects as well as fine and homogeneous microstructure. As a result, the successful processing of magnesium a...Continue Reading

References

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Aug 16, 2016·Materials Science & Engineering. C, Materials for Biological Applications·Sankalp AgarwalSwarna Jaiswal

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Citations

Dec 28, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Shuo WangZhenqing Hu
Apr 8, 2021·Journal of Materials Science. Materials in Medicine·Jingan LiShaokang Guan

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