磁兼容Au-25Pt合金的组织结构及综合性能

Au-Pt合金具有优异的MRI磁兼容性、良好的生物兼容性、高的耐蚀性等优点，在医用材料领域具有巨大的应用前景。采用X射线衍射仪、金相显微镜、维氏显微硬度仪和综合物性测量系统等，研究冷加工过程Au-25Pt合金丝材的组织结构演变及其对体积磁化率和维氏硬度的影响，为制备综合性能优异的Au-Pt合金探索有效途径。结果表明，固溶处理后的Au-25Pt合金为面心立方结构的单相固溶体，经30%~70%冷变形后，没有其它相产生。冷加工变形显著增加了Au-25Pt合金的维氏硬度，尤其在冷加工初期(<30%变形量)，但对磁化率影响很小。冷变形Au-25Pt合金不仅具有接近人体组织的体积磁化率(?8.5×10^?6)，还有较高的维氏硬度(HV0.1=160)。

Microstructure and comprehensive properties of MR-compatible Au-Pt alloy

Au-Pt alloy has great application prospects in the field of biomedical materials due to its advantages of excellent MR-compatibility, good biocompatibility and high corrosion resistance, etc. Its microstructure evolution and its effect on bulk magnetic susceptibility and hardness of Au-25Pt alloy wire during cold deformation were studied by X-ray diffraction (XRD), metallographic microscope, Vickers microhardness tester and comprehensive physical properties measurement system, and effective ways to prepare Au-Pt alloy with excellent comprehensive properties were explored. The results show that the Au-25Pt alloy is a single-phase solid solution with a face centered cubic structure after solution treatment, and that no other phase forms during 30%~70% cold deformation. Cold deformation significantly increases the Vickers hardness of Au-25Pt alloy, especially at the initial stage of cold deformation (<30%), but has little effect on the magnetic susceptibility. The cold-deformed Au-25Pt alloy not only has a volume magnetic susceptibility of ?8.5×10^?6 which is close to that of human tissue, but also has a higher Vickers hardness (HV0.1=160).