J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (7): 1211-1217.DOI: 10.1016/j.jmst.2019.01.007

• Orginal Article •     Next Articles

Microstructure, mechanical properties and deformation mechanisms of an as-cast Mg-Zn-Y-Nd-Zr alloy for stent applications

Jianfeng Wang, Hongbo Zhou, Liguo Wang, Shijie Zhu*(), Shaokang Guan*()   

  1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
  • Received:2018-10-10 Accepted:2018-11-28 Online:2019-07-20 Published:2019-06-20
  • Contact: Zhu Shijie,Guan Shaokang
  • About author:

    1These authors contributed equally to this work.

Abstract:

A new Mg-2Zn-0.2Y-0.5Nd-0.4 Zr (wt%) alloy designed specially for stent applications has been developed. The as-cast alloy is featured with equiaxed grains with a mean size of about 40 μm and a small amount of second phase (T phase) distributed discontinuously either at the grain boundaries or inside the grains. This alloy exhibits a tensile elongation of up to 35%, which is much larger than that of most reported other as-cast Mg alloys. The tensile deformation mechanisms have also been investigated. The results show that, besides basal slip, {10 - 12} extension twining and non-basal pyramidal slips can also be observed at initial stage and later stage during tensile deformation, respectively, which are responsible for the good room-temperature ductility.

Key words: Magnesium alloys, Vascular stents, Microstructure, Mechanical properties, Deformation mechanisms