中文摘要：

铁基材料由于其可降解性和无毒性，在血管支架材料领域具有潜在的应用前景。采用40kV的氮离子注入工业纯铁，注入剂量为1×10^17～7×10^17ions／cm^2，X射线衍射表征了材料袁面的物相结构，采用原子力显微镜研究了离子注入剂量对材料表面形貌的影响，并用Ra、RMS和Rz定量研究了离子注入后的表面粗糙度。结果表明，氮离子注入对纯铁表面形貌产生了一定的影响，随着注入离子剂量的增加，材料表面的粗糙度也随之增加。

英文摘要：

Pure iron and iron-based alloy are potential materials applying for coronary artery stents based on their biodegradable and nontoxic properties. In this paper, pure iron specimens were implanted by nitrogen ions at various doses from 1×10^17 to 7 × 10^17 ions/cm^2 using ion beam implanter at an extracted voltage of 40kV. Surface phase structure was investigated by X-ray diffraction. The atomic force microscopy was used to investigate the surface morphology of nitrogen ion implanted pure iron and quantitatively analyze the surface roughness with Ra, RMS and Rz. The results showed that, the surface morphology was changed since nitrogen ions implantation, with the increase of the implanted dosage of nitrogen ions, the surface roughness increased.