Influence of fine-grain and solid-solution strengthening on mechanical properties and in vitro degradation of WE43 alloy.
As one of the most important potential candidate alloys for vascular stent application, Mg-Y-Zr based Mg-4.2wt%Y-2.4wt%Nd-0.6wt%Ce(La)-0.5wt%Zr (WE43) alloys were investigated in combination with the forming processes of micro-tubes with 2.0 mm diameter and 0.1 mm wall thickness. Orthogonal experimental design for alloy composition, vacuum melting ingot, heat treatment, integrated plastic deformation and micro-tube forward extrusion are included in the processing procedures. Significant improvements in both the mechanical properties and corrosion resistance in phosphate buffered saline solution for WE43 alloys were achieved through this processing sequence. The influence of the heat treatment and hot extrusion on in vitro degradation and plasticity was found to be associated with grain size reduction and the redistribution of intermetallic particles within the microstructure. As a result, the mechanical properties and the corrosion resistance of Mg alloys can be improved through fine-grain strengthening and solid-solution strengthening to some extent.
State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou 730050, People's Republic of China. Department of Mechanical and Aerospace Engineering, University of California, San Diego, CA 92093-0411, USA.
Dexue
D
Liu
Yutian
Y
Ding
Tingbiao
T
Guo
Xiaoqiong
X
Qin
Chenggong
C
Guo
Shankun
S
Yu
Shengling
S
Lin
D000497:Alloys / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry*; D003343:Corrosion; D006358:Hot Temperature; D008274:Magnesium / Q000737:chemistry; D008422:Materials Testing; D008670:Metals / Q000737:chemistry; D011312:Pressure; D015607:Stents; D013314:Stress, Mechanical; D013718:Tensile Strength; D014652:Vascular Diseases / Q000628:therapy; D015019:Yttrium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
D000497:Alloys; D001672:Biocompatible Materials; D008670:Metals; D015019:Yttrium; D015040:Zirconium; D008274:Magnesium