水下搅拌摩擦加工Mg-Y-Nd合金的生物腐蚀性能  

Biocorrosion properties of Mg-Y-Nd magnesium alloy prepared by submerged friction stir processing

作　　者：曹耿华[1] 罗锡才[2] 张大童[2] 刘一雄[1] 郑振兴[1] 高吉祥[1] 

机构地区：[1]广东技术师范学院机电学院,广东广州510665 [2]华南理工大学广东省金属新材料制备与成形重点实验室,广东广州510641

出　　处：《材料热处理学报》2017年第8期28-34,共7页Transactions of Materials and Heat Treatment

基　　金：广东省自然科学基金团队项目(2015A030312003);广东省金属新材料制备与成形重点实验室开放课题(GJ201602)

摘　　要：为研究细晶镁合金的生物腐蚀性能,本研究采用水下搅拌摩擦加工技术(SFSP)制备了晶粒尺寸约为1.3μm、细小第二相颗粒弥散分布的细晶Mg-Y-Nd合金。通过质量损失测试研究其在模拟体液中的生物腐蚀性能,通过拉伸性能测试研究其腐蚀后的力学性能变化,利用扫描电镜观察其腐蚀后的表面及拉伸断口形貌。结果表明:SFSP技术有助于提高镁合金在模拟体液中的耐腐蚀性能;由于微观组织的细化和均匀化,细晶Mg-Y-Nd合金在模拟体液中呈现的是均匀腐蚀行为,在浸泡12 d后还保持了一定的承载强度。In order to investigate the biocorrosion properties of fine-grained magnesium alloys,the Mg-Y-Nd alloy with an average grain size of about 1.3 μm and the fine dispersed particle size distribution was prepared by submerged friction stir processing（SFSP）.The biocorrosion properties of the alloy in simulated body fluid（SBF） were evaluated by mass loss experiments,and the mechanical properties of the alloy after immersion were measured by tensile test,the corrosion surface and fracture morphology were observed by scanning electron microscopy.The results show that SFSP can improve the biocorrosion properties of the Mg-Y-Nd alloy in SBF,due to the refinement and homogenization of the microstructure,the fine-grained Mg-Y-Nd alloy shows uniform corrosion behavior in simulated body fluid,and maintained a certain bearing strength after immersion in SBF for 12 d.

关 键 词：Mg-Y-Nd合金 搅拌摩擦加工 生物腐蚀性能 力学性能 均匀腐蚀 

分 类 号：TG146.22[一般工业技术—材料科学与工程]