Microstructure, mechanical and corrosion properties of Mg-Dy-Gd-Zr alloys for medical applications

作者：Yang L^*; Huang Y; Feyerabend F; Willumeit R; Mendis C; Kainer K U; Hort N

来源：Acta Biomaterialia, 2013, 9(10): 8499-8508.

DOI：10.1016/j.actbio.2013.03.017

• Mg-Dy-Gd-Zr alloys
• Microstructure Mechanical properties
• Corrosion properties

In previous investigations, a Mg-10Dy (wt.%) alloy with a good combination of corrosion resistance and cytocompatibility showed great potential for use as a biodegradable implant material. However, the mechanical properties of Mg-10Dy alloy are not satisfactory. In order to allow the tailoring of mechanical properties required for various medical applications, four Mg-10(Dy + Gd)-0.2Zr (wt.%) alloys were investigated with respect to microstructure, mechanical and corrosion properties. With the increase in Gd content, the number of second-phase particles increased in the as-cast alloys, and the age-hardening response increased at 200 degrees C. The yield strength increased, while the ductility reduced, especially for peak-aged alloys with the addition of Gd. Additionally, with increasing Gd content, the corrosion rate increased in the as-cast condition owing to the galvanic effect, but all the alloys had a similar corrosion rate (similar to 0.5 mm year(-1)) in solution-treated and aged condition.

• 出版日期2013-11