Impact of ruthenium on microstructure and corrosion behavior of β-type Ti-Nb-Ru alloys for biomedical applications

Arne Biesiekierski, D. H. Ping, Y. Yamabe-Mitarai, Cuie Wen

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Corrosion behavior and microstructure of as-cast metastable β-type Ti-20Nb- xRu (x= 0, 0.5, 1.0, 1.5. at.%) have been investigated using linear polarization and transmission electron microscopy (TEM), respectively. Ruthenium (Ru) was confirmed to be a β-phase stabilizer as a titanium (Ti) alloying element which served to suppress both ω precipitation and elemental segregation; the prominence and degree of elemental segregation between the Nb-rich primary dendrites and the interdendritic areas rapidly decreased with minor Ru addition, yielding a more homogenous microstructure overall. Additionally, even minimal Ru additions significantly altered the corrosion potential (Ecorr), yielding a 0.3V shift in the noble direction over the Ru-free controls, along with a comparable shift in the potential at which the initial passive region begins to fail (Einc). The present result suggests Ru addition can confer a greater resistance to corrosion in β-Ti alloys.

Original languageEnglish
Pages (from-to)303-309
Number of pages7
JournalMaterials and Design
Volume59
DOIs
Publication statusPublished - 2014 Jul

Keywords

  • Biomaterials
  • Corrosion
  • Microstructure
  • Transmission electron microscopy
  • β-Titanium alloys

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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