Microstructure and Properties of Mg-3Zn-0.2Ca Alloy for Biomedical Application

作者：Yang Min; Liu Debao^*; Zhang Runfang; Chen Minfang

来源：Rare Metal Materials and Engineering, 2018, 47(1): 93-98.

DOI：10.1016/s1875-5372(18)30078-x

• Mg-Zn-Ca alloy
• microstructure
• mechanical property
• bio-corrosion behavior

Microstructure, mechanical properties and bio-corrosion properties of Mg-3Zn-0.2Ca alloys were investigated for biomedical application by X-ray diffraction (XRD), optical microscopy (OM), scanning electronic microscopy (SEM), mechanical properties testing, electrochemical and immersion measurement. The XRD shows that the main second phases in the alloy are Mg-Zn intermetallic compounds such as Mg7Zn3, Mg2Zn3, and Mg4Zn7. In comparison with the cast alloy, the average grain size of the extruded Mg-3Zn-0.2Ca alloy is significantly decreased by 47.6 times from 119.1 mu m to 2.5 mu m after extrusion ratio 56:1 deformation. The tensile yield strength (0.2%TYS), ultimate tensile strength and elongation of the extrude alloys are 205 MPa, 336 MPa and 17.85%, respectively. The electrochemical and the immersion tests show that the corrosion resistance of the extruded alloy is obviously higher than that of the cast alloy due to the fine grained microstructure. The newly designed Mg-3Zn-0.2Ca alloy exhibits the good combination of mechanical performance and corrosion resistance for biomedical application.

• 出版日期2018-1
• 单位天津理工大学