Jurgeleit Till, Jessen Lea Katharina, Quandt Eckhard, Zamponi Christiane
Institute for Materials Science, Faculty of Engineering, University of Kiel, Kaiserstrasse 2, 24143 Kiel, Germany.
Materials (Basel). 2018 Mar 23;11(4):482. doi: 10.3390/ma11040482.
FeMn alloys show a great potential for the use as a biodegradable material for medical vascular implants. To optimize the material properties, with respect to the intended application, new fabrication methods also have to be investigated. In this work different Fe-FeMn32 multilayer films were deposited by magnetron sputtering. The deposition was done on a substrate structured by UV lithography. This technique allows the fabrication of in-situ structured foils. In order to investigate the influence of the Mn content on the material properties foils with an overall Mn content of 5, 10, 15, and 17 wt % were fabricated. The freestanding foils were annealed post-deposition, in order to homogenize them and adjust the material properties. The material was characterized in terms of microstructure, corrosion, mechanical, and magnetic properties using X-ray diffraction, electron microscopy, electrochemical polarization, immersion tests, uniaxial tensile tests, and vibrating sample magnetometry. Due to the unique microstructure that can be achieved by the fabrication via magnetron sputtering, the annealed foils showed a high mechanical yield strength (686-926 MPa) and tensile strength (712-1147 MPa). Owing the stabilization of the non-ferromagnetic ε- and γ-phase, it was shown that even Mn concentrations of 15-17 wt % are sufficient to distinctly enhance the magnetic resonance imaging (MRI) compatibility of FeMn alloys.
铁锰合金在用作医用血管植入物的可生物降解材料方面具有巨大潜力。为了根据预期应用优化材料性能，还必须研究新的制造方法。在这项工作中，通过磁控溅射沉积了不同的Fe-FeMn32多层膜。沉积是在通过紫外光刻结构化的基板上进行的。这种技术允许制造原位结构化箔。为了研究锰含量对材料性能的影响，制备了总锰含量为5、10、15和17 wt%的箔。独立箔在沉积后进行退火，以使其均匀化并调整材料性能。使用X射线衍射、电子显微镜、电化学极化、浸泡试验、单轴拉伸试验和振动样品磁强计对材料的微观结构、腐蚀、机械和磁性能进行了表征。由于通过磁控溅射制造可以实现独特的微观结构，退火后的箔显示出高机械屈服强度（686-926 MPa）和拉伸强度（712-1147 MPa）。由于非铁磁性ε相和γ相的稳定，结果表明，即使锰浓度为15-17 wt%也足以显著提高铁锰合金的磁共振成像（MRI）兼容性。
