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	Forming of magnesium alloy microtubes in the fabrication of biodegradable stents
	Lixiao Wang ; Gang Fang ; Lingyun Qian ; Sander Leeflang ; Jurek Duszczyk ; Jie Zhou ; Lixiao Wang ; Gang Fang ; Lingyun Qian ; Sander Leeflang ; Jurek Duszczyk ; Jie Zhou
	2016-03-30 ; 2016-03-30
关键词	gas turbines wireless MEMS sensing system real-time monitor harsh environment high-temperature high-pressure R318.08
其他题名	Forming of magnesium alloy microtubes in the fabrication of biodegradable stents
中文摘要	Magnesium alloys have, in recent years, been recognized as highly promising biodegradable materials, especially for vascular stent applications. Forming of magnesium alloys into high-precision thin-wall tubes has however presented a technological barrier in the fabrication of vascular stents, because of the poor workability of magnesium at room temperature. In the present study, the forming processes, i.e., hot indirect extrusion and multi-pass cold drawing were used to fabricate seamless microtubes of a magnesium alloy. The magnesium alloy ZM21 was selected as a representative biomaterial for biodegradable stent applications. Microtubes with an outside diameter of 2.9 mm and a wall thickness of 0.2 mm were successfully produced at the fourth pass of cold drawing without inter-pass annealing. Dimensional evaluation showed that multipass cold drawing was effective in correcting dimensional non-uniformity arising from hot indirect extrusion. Examinations of the microstructures of microtubes revealed the generation of a large number of twins as a result of accumulated work hardening at the third and fourth passes of cold drawing, corresponding to the significantly raised forming forces. The work demonstrated the viability of the forming process route selected for the fabrication of biodegradable magnesium alloy microtubes.; Magnesium alloys have, in recent years, been recognized as highly promising biodegradable materials, especially for vascular stent applications. Forming of magnesium alloys into high-precision thin-wall tubes has however presented a technological barrier in the fabrication of vascular stents, because of the poor workability of magnesium at room temperature. In the present study, the forming processes, i.e., hot indirect extrusion and multi-pass cold drawing were used to fabricate seamless microtubes of a magnesium alloy. The magnesium alloy ZM21 was selected as a representative biomaterial for biodegradable stent applications. Microtubes with an outside diameter of 2.9 mm and a wall thickness of 0.2 mm were successfully produced at the fourth pass of cold drawing without inter-pass annealing. Dimensional evaluation showed that multipass cold drawing was effective in correcting dimensional non-uniformity arising from hot indirect extrusion. Examinations of the microstructures of microtubes revealed the generation of a large number of twins as a result of accumulated work hardening at the third and fourth passes of cold drawing, corresponding to the significantly raised forming forces. The work demonstrated the viability of the forming process route selected for the fabrication of biodegradable magnesium alloy microtubes.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/143830]
专题	清华大学
推荐引用方式 GB/T 7714	Lixiao Wang,Gang Fang,Lingyun Qian,et al. Forming of magnesium alloy microtubes in the fabrication of biodegradable stents[J],2016, 2016.
APA	Lixiao Wang.,Gang Fang.,Lingyun Qian.,Sander Leeflang.,Jurek Duszczyk.,...&Jie Zhou.(2016).Forming of magnesium alloy microtubes in the fabrication of biodegradable stents..
MLA	Lixiao Wang,et al."Forming of magnesium alloy microtubes in the fabrication of biodegradable stents".(2016).

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