Feng Yu Ping, Blanquer Andreu, Fornell Jordina, Zhang Huiyan, Solsona Pau, Baró Maria Dolors, Suriñach Santiago, Ibáñez Elena, García-Lecina Eva, Wei Xinquan, Li Ran, Barrios Lleonard, Pellicer Eva, Nogués Carme, Sort Jordi
Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain.
J Mater Chem B. 2016 Oct 21;4(39):6402-6412. doi: 10.1039/c6tb01951j. Epub 2016 Sep 21.
Two new Fe-based alloys, Fe-10Mn6Si1Pd and Fe-30Mn6Si1Pd, have been fabricated by arc-melting followed by copper mold suction casting. The Fe-30Mn6Si1Pd alloy mainly consists of ε-martensite and γ-austenite Fe-rich phases whereas the Fe-10Mn6Si1Pd alloy primarily contains the α-Fe(Mn)-ferrite phase. Additionally, Pd-rich precipitates were detected in both alloys. Good mechanical response was observed by nanoindentation: hardness values around 5.6 GPa and 4.2 GPa and reduced Young's moduli of 125 GPa and 93 GPa were measured for the as-prepared Fe-10Mn6Si1Pd and Fe-30Mn6Si1Pd alloys, respectively. Both alloys are thus harder and exhibit lower Young's modulus than 316L stainless steel, which is one of the most common Fe-based reference materials used for biomedical applications. Compared with the ferromagnetic Fe-10Mn6Si1Pd alloy, the paramagnetic Fe-30Mn6Si1Pd alloy is more appropriate to be used as an implant since it would be compatible for nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) analyses. Concerning biocompatibility, the more hydrophilic Fe-10Mn6Si1Pd alloy shows improved cell adhesion but its pronounced ion leaching has a negative effect on the proliferation of cells. The influence of immersion in a simulated body fluid on the composition, microstructure, mechanical and magnetic properties of both alloys is assessed, and the correlation between microstructure evolution and physical properties is discussed.
通过电弧熔炼然后铜模吸铸制备了两种新型铁基合金，Fe-10Mn6Si1Pd和Fe-30Mn6Si1Pd。Fe-30Mn6Si1Pd合金主要由ε-马氏体和γ-奥氏体富铁相组成，而Fe-10Mn6Si1Pd合金主要包含α-Fe(Mn)-铁素体相。此外，在两种合金中均检测到富Pd析出物。通过纳米压痕观察到良好的力学响应：对于制备态的Fe-10Mn6Si1Pd和Fe-30Mn6Si1Pd合金，分别测得硬度值约为5.6 GPa和4.2 GPa，约化杨氏模量为125 GPa和93 GPa。因此，这两种合金都比316L不锈钢更硬且杨氏模量更低，316L不锈钢是用于生物医学应用的最常见的铁基参考材料之一。与铁磁性的Fe-10Mn6Si1Pd合金相比，顺磁性的Fe-30Mn6Si1Pd合金更适合用作植入物，因为它与核磁共振（NMR）和磁共振成像（MRI）分析兼容。关于生物相容性，亲水性更强的Fe-10Mn6Si1Pd合金显示出改善的细胞粘附，但明显的离子浸出对细胞增殖有负面影响。评估了在模拟体液中浸泡对两种合金的成分、微观结构、力学和磁性能的影响，并讨论了微观结构演变与物理性能之间的相关性。
