Preparation, microstructure and degradation behavior of Mg-2Zn-0.4Sc-0.2Zr alloy wire
(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China;
3. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China;
4. Department of Hepatobiliary Surgery, Human Provincial People’s Hospital/The First-affiliated Hospital of Hunan Normal University, Changsha 410005, China)
2. Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China;
3. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China;
4. Department of Hepatobiliary Surgery, Human Provincial People’s Hospital/The First-affiliated Hospital of Hunan Normal University, Changsha 410005, China)
Abstract: A biodegradable Mg-2Zn-0.4Sc-0.2Zr (ZK20-0.4Sc) alloy wire with a diameter of 0.5 mm was prepared by a combination of hot extrusion and cold-drawing. The average grain size of ZK20-0.4Sc alloy wire on the longitudinal section along the drawing direction is approximately 7.3 mm. The texture results show relatively strong á ？ and weak á ？ fiber texture components parallel to the drawing direction. The ZK20-0.4Sc alloy wire exhibits better mechanical properties with the tensile strength, yield strength and elongate of (329±2) MPa, (287±2) MPa and (14.2±0.5)%, respectively. The better mechanical properties are mainly attributed to the grain refinement strengthening, dislocation strengthening and precipitation strengthening. With the immersion time increasing to 14 d, the corrosion type transfers from filament corrosion and pitting corrosion to severe localized corrosion.
Key words: Mg alloy wire; cold drawing; microstructure; mechanical properties; degradation behavior