Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 31    No. 2    February 2021

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Microstructure, anticorrosion, biocompatibility and antibacterial activities of extruded Mg-Zn-Mn strengthened with Ca
Bao-sheng LIU1, Miao-miao CAO1, Yue-zhong ZHANG2, Yong HU1, Chang-wei GONG1, Li-feng HOU3, Ying-hui WEI1,3

1. College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;
2. College of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;
3. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Abstract:To find suitable biodegradable materials for implant applications, Mg-6Zn-0.3Mn-xCa (x=0, 0.2 and 0.5, wt.%) alloys were prepared by semi-continuous casting followed by hot-extrusion technique. The microstructure and mechanical properties of Mg-6Zn-0.3Mn-xCa alloys were investigated using the optical microscope, scanning electron microscope and tensile testing. Results indicated that minor Ca addition can slightly refine grains of the extruded Mg-6Zn-0.3Mn alloy and improve its strength. When 0.2 wt.% and 0.5 wt.% Ca were added, the grain sizes of the as-extruded alloys were refined from 4.8 to 4.6 and 4.2 μm, respectively. Of the three alloys studied, the alloy with 0.5 wt.% Ca exhibits better combined mechanical properties with the ultimate tensile strength and elongation of 334 MPa and 20.3%. The corrosion behaviour, cell viability and antibacterial activities of alloys studied were also evaluated. Increasing Ca content deteriorates the corrosion resistance of alloys due to the increase of amount of effective cathodic sites caused by the formation of more Ca2Mg6Zn3 phases. Cytotoxicity evaluation with L929 cells shows higher cell viability of the Mg-6Zn-0.3Mn-0.5Ca alloy compared to Mg-6Zn-0.3Mn and Mg-6Zn-0.3Mn- 0.2Ca alloys. The antibacterial activity against Staphylococcus aureus is enhanced with increasing the Ca content due to its physicochemical and biological performance in bone repairing process.

 

Key words: magnesium alloy; bio-corrosion; antibacterial activities; microstructure; mechanical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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