论文部分内容阅读
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 study the bio-corrosion of fine-grained magnesium alloy, a fine-grained Mg-Y-Nd alloy with a grain size of about 1.3μm and fine second-phase particles dispersed was prepared by underwater friction stir processing (SFSP). The bio-corrosion performance in simulated body fluid was studied by mass loss test. The changes of mechanical properties after corrosion were studied by tensile test. The corrosion surface and tensile fracture morphology were observed by SEM. The results show that SFSP technology can improve the corrosion resistance of magnesium alloys in simulated body fluids. Due to the refinement and homogenization of microstructure, the fine-grained Mg-Y-Nd alloys exhibit uniform corrosion behavior in simulated body fluids. After soaking for 12 days, the bearing strength was also maintained.