Microstructures and Properties of Biomedical Mg-Zn-Sn-Zr Rolled Alloys

Abstract

The as-cast Mg-2.0Zn-1.5Sn-xZr(x= 0,0.4, 0.6, 0.8, 1.0 wt%) alloy was rolled with the pressure less than 5% each time. The microstructure, mechanical properties, corrosion properties and biocompatibility of the alloy were investigated. The microstructure of the alloy was observed and analyzed by scanning electron microscope, and the tensile test was carried out by universal tensile machine. The corrosion resistance of the alloy in Hank’s solution was studied by hydrogen evolution experiment and electrochemical test, and the biocompatibility of the alloy was tested by L929 cells. The results show that Mg-2Zn-1.5Sn-xZr alloy has excellent mechanical properties. The elongation of Mg-2Zn-1.5Sn-xZr alloy decreases with the increase of Zr content, but the tensile strength first increases and then decreases with the increase of Zr concentration. When the Zr content is 0.8 wt%, the maximum tensile strength of the alloy is 235 MPa. The results of hydrogen evolution experiment and electrochemical analysis show that the corrosion resistance of the alloy is the best when the Zr content is 0.8 wt%, and all the five alloys have high biocompatibility. In conclusion, the rolled alloy has good properties and has broad application prospects in the field of biomaterials.

Keywords

magnesium alloy / corrosion performance / mechanical properties / biocompatibility

References

[1] Cicek S, Karaca A, Torun I, et al. The Relationship of Surface Roughness and Wettability of 316L Stainless Steel Implants with Plastic Deformation Mechanisms. Mater. Today Proc., 2019, 7: 389-393. J]

[2] Alipal J, Nayan NHM, Sahari N, et al. An Updated Review on Surface Functionalisation of Titanium and Its Alloys for Implants Applications. Mater. Today Proc., 2021, 42: 270-282. J]

[3] Fu J, Su Y, Qin Y, et al. Evolution of Metallic Cardiovascular Stent Materials: A Comparative Study among Stainless Steel, Magnesium and Zinc. Biomater., 2019, 230: 119 641. J]

[4] Pokharel DB, Wu L, Dong J, et al. Effect of Glycine Addition on the In-vitro Corrosion Behavior of AZ31 Magnesium Alloy in Hank’s Solution. J. Mater. Sci. Technol., 2021, 81: 97-107. J]

[5] Im SH, Jung Y, Kim SH. Current Status and Future Direction of Biodegradable Metallic and Polymeric Vascular Scaffolds for Next-generation Stents. Acta. Biomater., 2017, 60: 3-22. J]

[6] Song GL, Atrens A. Corrosion Mechanisms of Magnesium Alloys. Adv. Eng. Mater., 2010, 1(1): 11-33. J]

[7] Zhao W. Preparation, Bioactivity and Antibacterial Properties of New Magnesium Alloy (Mg-1.5Sn-xZn) for Osteology, 2020 Chongqing: Chongqing. Med. Univ.. [D]

[8] Lu S. Nonferrous Casting Alloys and Smelting, 1983 Beijing: Natl. Def. Ind. Press. [M]

[9] American Society for Materials and Testing. Standard Practice for Laboratory Immersion Corrosion Testing of Metals[S]. ASTM G31-1972, 2004

[10] Abidin NIZ, Rolfe B, Owen H, et al. The in Vivo and in Vitro Corrosion of High-purity Magnesium and Magnesium Alloys WZ21 and AZ91. Corros. Sci., 2013, 75: 354-366. J]

[11] Zhou S, Tian C, Alzoabi S, et al. Performance of an Al-0.08Sn-0.08Ga-xMg Alloy as an Anode for Al-air Batteries in Alkaline Electrolytes. J. Mater. Sci., 2020, 55: 11 477-11 488. J]

[12] Pekguleryuz Kainer K. Fundamentals of Magnesium Alloy Metallurgy, 2013 Harbin: Harbin. Inst. Technol. Press.

[13] Li C. Metallic Principle, 1996 Harbin: Harbin. Inst. Technol. Press. [M]

[14] Sun S, Weng K, Yuan G. Effect of Sn on Microstructure and Mechanical Properties of Magnesium Alloy. Chin. Sci. Nonferrous. Met., 1999, 9: 55-58. [J]

[15] Meng F, Wang J, Liu L, et al. Thermodynamic Modeling of the Mg-Sn-Zn Ternary System. J. Alloy. Compd., 2010, 508(2): 570-581. J]

[16] Yamashita A, Horita Z, Langdon TG. Improving the Mechanical Properties of Magnesium and a Magnesium Alloy Through Severe Plastic Deformation. Mater. Sci. Eng. A, 2001, 300(1–2): 142-147. J]

[17] Long M, Rack HJ. Titanium Alloys in Total Joint Replacement-a Materials Science Perspective. Biomater., 1998, 19(18): 1 621-1 639. J]

[18] Li Z, Gu X, Lou S, et al. The Development of Binary Mg-Ca Alloys for Use as Biodegradable Materials Within Bone. Biomater., 2008, 29: 1 329-1 344. J]

[19] Li J, Jiang Q, Sun H, et al. Effect of Heat Treatment on Corrosion Behavior of AZ63 Magnesium Alloy in 3.5 wt% Sodium Chloride Solution. Corros. Sci., 2016, 111: 288-301. J]

[20] Wu P, Xu F, Deng K, et al. Effect of Extrusion on Corrosion Properties of Mg-2Ca-xAl (x=0,2,3,5) Alloys. Corros. Sci., 2017, 127: 280-290. J]

[21] Zhou Y, Li Y, Luo D, et al. Microstructures, Mechanical and Corrosion Properties and Biocompatibility of as Extruded Mg-Mn-Zn-Nd Alloys for Biomedical Applications. Mater. Sci. Eng. C-Mater., 2015, 49: 93-100. J]