Exploring the role of Fe in the wear and corrosion resistance of Ti-based alloys produced with conventional powder metallurgy

GÖLBAŞI Z., İÇİN K., Sünbül S. E., ÖZTÜRK B.

Tribology International, vol.200, 2024 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 200
  • Publication Date: 2024
  • Doi Number: 10.1016/j.triboint.2024.110177
  • Journal Name: Tribology International
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Corrosion resistance, Mechanical properties, Powder metallurgy, Ti-based alloys, Wear
  • Karadeniz Technical University Affiliated: Yes

Abstract

In this study, the Ti-6Al-XFe alloy was produced by conventional powder metallurgy at varying Fe contents (3.5, 7.0, 10.5, 14.0, 17.5, and 21.0 wt%) to investigate its potential as a substitute for Nb and V. The primary aim was to assess the impact of Fe content on the mechanical, tribological, and electrochemical properties of the alloys, focusing on their suitability for biomedical implants. XRD and SEM analyses revealed a decrease in the α-Ti phase and an increase in the β-Ti and FeTi phases with higher Fe content. The lowest porosity (0.8 %) and highest hardness (348.4 Hv0.2) were observed in the Ti-6Al-17.5Fe alloy. Tensile and flexural strengths peaked at 238.3 MPa and 680 MPa, respectively, in the 17.5Fe alloy. The Ti-6Al-14.0Fe alloy showed the smallest change in specific wear rate (0.274 × 10−6 mm3/N·m) under dry conditions, while the Ti-6Al-7.0Fe alloy had the smallest change (0.565 × 10−6 mm3/N·m) under wet conditions. The 7.0Fe alloy demonstrated the highest corrosion resistance, with the lowest Icorr (1.02 × 10−8 mm3/N·m) and corrosion rate (14.02 × 10−3 mpy), and the highest charge transfer resistance in EIS analysis.