ABSTRACT

The application of biodegradable Magnesium (Mg) alloy implants is limited due to their insufficient corrosion fatigue resistance. This work investigated the influence of double extrusion on the microstructure, mechanical properties and corrosion fatigue behaviour of Mg–Zn–Y–Nd alloy. The results showed that, after double extrusion, the texture intensity was significantly weakened and a more uniform microstructure with fine grain size was obtained. The double extruded alloy showed improved mechanical properties with a yield strength of 196.5 MPa, an ultimate tensile strength of 241.8 MPa and an elongation up to 29.7%. As compared to that of single extruded Mg–Zn–Y–Nd alloy, the fatigue tests indicated that double extrusion improved the fatigue strength of the alloy by 23% in air and 20% in simulated body fluid. Based on the results, the mechanisms of fatigue and corrosion fatigue of double extruded Mg–Zn–Y–Nd alloy were presented.

摘要

可生物降解的镁（Mg）合金植入物由于其抗腐蚀疲劳性不足而限制了其应用。本工作研究了双挤压对 Mg-Zn-Y-Nd 合金显微组织、力学性能和腐蚀疲劳行为的影响。结果表明，双挤压后，织构强度明显减弱，获得更均匀、晶粒细小的显微组织。双挤压合金显示出改进的机械性能，屈服强度为 196.5 MPa，极限抗拉强度为 241.8 MPa，伸长率高达 29.7%。疲劳试验表明，与单次挤压的 Mg-Zn-Y-Nd 合金相比，双挤压使合金在空气中的疲劳强度提高了 23%，在模拟体液中提高了 20%。根据结果​​，