摘要
Mg−Nd−Zn−Zr生物可降解镁合金(JDBM)作为一种生物医用材料得到了广泛的关注和研究。为了加工高质量的JDBM丝材,通过显微镜观察、拉伸试验和浸没试验研究退火对拉拔后JDBM线材力学性能和降解行为的影响。对于直径为3 mm的挤压态合金丝,室温拉拔加工最多可连续进行9道次而无需退火,累积拉伸变形为125%。对拉拔后的合金丝分别在325℃退火30 min、350℃退火5 min或450℃退火3 min后发生完全再结晶。室温拉伸试验和模拟体液浸没试验结果表明,在稍高的温度下进行短时间退火后,由于晶粒细小和沉淀物的分散分布,合金丝可以获得更好的性能。在本研究中,在350℃下退火5 min是拉拔后最佳的退火参数,可用于进一步制造更细的合金丝材。
Mg−Nd−Zn−Zr magnesium alloy(JDBM)has been studied widely as biodegradable medical material.To process high quality JDBM wires,effects of annealing on the mechanical properties and degradation behavior after drawing were studied by microscopic observations,tensile and immersion tests.The as-extruded wires with a diameter of 3 mm could be drawn up to 9 passes without annealing until 125%cumulative drawing deformation.Complete recrystallization occurred after annealing at 325℃ for 30 min,350℃ for 5 min or 450℃for 3 min,respectively.Room temperature tensile tests and simulated body fluid immersion tests showed that annealing at slightly elevated temperature for short time could obtain better properties due to the finer grain size and more dispersive distribution of precipitates.For this study,annealing at 350℃ for 5 min is the best parameters which can be utilized to further fabricate fine wires.
作者
田圆
苗宏卫
牛佳林
黄华
康斌
曾晖
丁文江
袁广银
Yuan TIAN;Hong-wei MIAO;Jia-lin NIU;Hua HUANG;Bin KANG;Hui ZENG;Wen-jiang DING;Guang-yin YUAN(National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite,Shanghai Jiao Tong University,Shanghai 200240,China;National&Local Joint Engineering Research Center of Orthopedic Biomaterials,Department of Bone&Joint Surgery,Peking University Shenzhen Hospital,Shenzhen 518036,China)
基金
This work was financially supported by the National Natural Science Foundation of China(No.U1804251)
the Shanghai Municipal Commission of Economy and Information,China(No.GYQJ-2019-1-27)
the Science and Technology Commission of Shanghai Municipality,China(Nos.18441908000,19441906300,19441913400)
the Shenzhen’s Three Renowned Project,China(No.SZSM201612092)
the Shanghai Jiao Tong University Medical-engineering Cross Fund,China(No.YG2019ZDA02).
