付军健,杜文博,杜宪,刘轲,李淑波,付金龙,王朝辉.血管支架用镁合金微细管制备工艺与性能研究[J].稀有金属材料与工程,2020,49(10):3576~3581.[Fu Junjian,Du Wenbo,Du Xian,Liu Ke,Li Shubo,Fu Jinlong,Wang Zhaohui.Study on the Fabrication and Properties of Magnesium Alloy Microtubes for Vascular Stent[J].Rare Metal Materials and Engineering,2020,49(10):3576~3581.]
血管支架用镁合金微细管制备工艺与性能研究
投稿时间:2019-11-06  修订日期:2019-12-03
中文关键词:  Mg-Zn-Mn-Ca镁合金  挤压  拉拔  组织演变  机械性能
基金项目:北京市教委资助项目(KZ201810005005);北京市自然科学基金资助项目(2172013);北京市教委资助项目(KM201710005005)
中文摘要:
      镁合金作为新型可降解医用金属材料,在血管支架领域具有广阔的应用前景。由于镁合金晶体结构为密排六方结构,塑性变形能力差,导致镁合金微细管制备困难。本文针对作者开发的新型可降解Mg-4Zn-0.2Mn-0.2Ca镁合金,采用热挤压-拉拔复合工艺成功制备出外径3.1~3.6 mm、壁厚0.25~0.4 mm的微细管。针对外径3.6 mm,壁厚0.4 mm微细管组织演变及机械性能开展的研究结果表明:微细管材的塑性变形经过了滑移、孪生及再结晶等过程,并产生了显著的加工硬化现象;管材的抗拉强度为427.3 MPa,屈服强度为383.4 MPa,伸长率为5.2%;经300 ℃,30 min的退火处理,管材组织变得相对均匀,强度有所降低,但伸长率增加到18.0%,有利于后期支架的精密加工。
Study on the Fabrication and Properties of Magnesium Alloy Microtubes for Vascular Stent
英文关键词:Mg-Zn-Mn-Ca alloy  extrusion  drawing  microstructure evolution  mechanical properties
英文摘要:
      Magnesium alloys, as a new type of biodegradable medical metal material, have a promising application in the field of vascular stents. However, the poor deformability of Mg alloys due to hexagonal close-packed (hcp) structure makes it difficult to fabricate their thin tube. In this study, the micro-tubes of Mg-4Zn-0.2Mn-0.2Ca alloy, a new type of degradable magnesium alloy, with 3.1~3.6 mm in outer diameter and 0.25~0.4 mm in thickness were prepared by hot extrusion-drawing composite process. The microstructure evolution and mechanical properties of the one with 3.6 mm in outer diameter, 0.4 mm in thickness showed that the crystal slip, twins and recrystallization occurred during the plastic deformation of the tubes, and the work hardening was significant. This drawn tube exhibited a tensile strength of 427.3 MPa, yield strength of 383.4 MPa, and elongation of 5.2%. After annealing at 300℃ for 30 min, the microstructure became uniform and the elongation increased to 18.0%, which is conducive to the fabrication of vascular stents.
作者单位E-mail
付军健 北京工业大学 fujunjian@emails.bjut.edu.cn 
杜文博 北京工业大学 duwb@bjut.edu.cn 
杜宪 北京工业大学 duxian@bjut.edu.cn 
刘轲 北京工业大学 lk@bjut.edu.cn 
李淑波 北京工业大学 lishubo@bjut.edu.cn 
付金龙 北京工业大学 fujinlong@bjut.edu.cn 
王朝辉 北京工业大学 wangzhaohui@bjut.edu.cn 
摘要点击次数: 52
全文下载次数: 34
查看全文  查看/发表评论  
关闭