Effect of silver additions on the microstructure, mechanical properties and corrosion behavior of biodegradable Fe-30Mn-6Si

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • N. Babacan - , Sivas Science and Technology University (Author)
  • F. Kochta - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • K.-H. Hoffmann - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • T. Gemming - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • U. Kuehn - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • L. Giebeler - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • A. Gebert - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • J. Hufenbach - , Freiberg University of Mining and Technology (Author)

Abstract

FeMn-based alloys are promising materials for vascular implant applications, especially due to their superior mechanical properties and excellent processability. However, a further increase of the biodegradation rate of these metallic materials is desired. The addition of silver was reported to be a promising approach for accelerating the corrosion rate of those FeMn-based alloys by promoting local corrosion due to galvanic coupling, besides improving their antibacterial properties. On the other hand, the corrosion mechanisms occurring due to silver addition in various FeMn-based systems have not been understood completely. In this study, the effect of different silver contents (0.6 wt% and 1.2 wt%) on the microstructure, mechanical and corrosion properties of a cast biodegradable Fe-30Mn-6Si (wt%) is presented. By silver addition, finely distributed Ag-rich precipitates are formed in the matrix composed of austenite and epsilon-martensite, which could be detected by investigations with scanning electron and transmission electron microscopy as well as X-ray diffraction. Furthermore, an enhanced epsilon-martensite fraction was observed with rising Ag content. These changes in the microstructure significantly influence the corrosion properties. By means of potentiodynamic polarization measurements in a simulated body fluid (SBF) at 37 degrees C, it was revealed that the Ag additions reduce the corrosion current density, which indicates a decreased corrosion rate in comparison to Fe-30Mn-6Si. However, the alloy modifications still show higher corrosion current densities than a cast Fe-30Mn reference system. In addition, higher yield strengths for Agadded alloys were detected by quasi-static tensile and compression tests.

Data availability: The processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

Details

Original languageEnglish
Article number102689
Number of pages11
JournalMaterials today communications
Volume28
Publication statusPublished - Sept 2021
Peer-reviewedYes
Externally publishedYes

External IDs

Scopus 85111711645

Keywords

Keywords

  • Iron-based alloy, Biodegradable, Microstructure, Mechanical properties, Corrosion behavior, IN-VITRO DEGRADATION, MN-AG ALLOYS, SHAPE-MEMORY ALLOY, FE-BASED ALLOYS, CRYSTAL-STRUCTURE, DESIGN, IRON, BIOMATERIALS, VIVO, PD