中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 21 No. 4 April 2011 |
β-TCP reinforced Mg-Zn-Zr composites
（1. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;
2. Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin 300384, China）
Abstract:Magnesium alloys have good biocompatibility, but their mechanical properties and corrosion resistance may not be satisfied for using as degradable materials within bone due to its high corrosion rate in the physiological environment. Nano β-TCP particles were added into Mg-Zn-Zr alloy to improve its microstructure and the properties. As-extruded Mg-3Zn-0.8Zr alloy and Mg-3Zn-0.8Zr/xβ-TCP (x=0.5%, 1.0% and 1.5%) composites were respectively fabricated. The grains of Mg-Zn-Zr/β-TCP composites were significantly refined. The results of the tensile tests indicate that the ultimate tensile strength and the elongation of composites were improved with the addition of β-TCP. The electrochemical test result in simulation body fluid shows that the corrosion resistance of the composites was strongly enhanced comparing with that of the alloy. The corrosion potential of Mg-3Zn0.8-Zr/1.0β-TCP composite is −1.547 V and its corrosion current density is 1.20×10−6 A/cm2.
Key words: β-tricalcium phosphate; magnesium composite; microstructure; mechanical properties; biodegradation
