(1. 南京工程学院材料工程学院，南京 211167；
2. 江苏省先进结构材料与应用技术重点实验室，南京 211167；
3. 江苏康尚医疗器械有限公司，丹阳 212300)
摘 要: 为提高生物镁合金的力学和腐蚀性能，对挤压态Mg-3Gd-1Nd-0.3Sr-0.2Zn-0.4Zr镁合金进行不同温度的时效处理，研究时效温度对合金显微组织、室温力学性能和在模拟体液中腐蚀性能的影响。结果表明：合金的析出相呈针状且富含Zr元素。时效处理后合金的显微硬度和屈服强度均比挤压态的高，且随时效温度的升高先升高后降低，当时效温度为185 ℃时，合金的显微硬度和屈服强度最高。腐蚀速率随着时效温度的升高先降低后升高，时效温度为230 ℃时，其质量损失腐蚀速率为挤压态的52%±7%。
关键字: 时效处理；生物镁合金；力学性能；腐蚀性能
（1. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, China;
3. Jiangsu Konsung Equipment Co., Ltd, Danyang 212300, China）
Abstract:In order to improve the mechanical and corrosion properties of biomagnesium alloy, the aging treatments at different temperatures were conducted on the as-extruded Mg-3Gd-1Nd-0.3Sr-0.2Zn-0.4Zr alloy. The effects of the aging temperature on microstructure, room-temperature mechanical properties and corrosion properties in simulated body fluid of the alloy were studied. The results show that the Zr-rich needle-like precipitate is observed. The microhardness and yield strength of the alloy after aging treatment are higher than those of the as-extruded alloy, and they first increase and then decline with increasing aging temperature. The highest microhardness and yield strength are obtained at the aging temperature of 185 ℃. The corrosion rate of the alloy first decreases and then increases with increasing aging temperature, and the lowest corrosion rate of the alloy is acquired aged at 230 ℃, which is only 52%±7% compared to that of the as-extruded alloy obtained by mass loss test.
Key words: aging treatment; biomagnesium alloy; mechanical property; corrosion property
