ELECTROCHEMICAL CHARACTERISTIC AND MICROSTRUCTURE OF Ti-6Al-7Nb ALLOY BY CENTRIFUGAL CASTING FOR ORTHOPEDIC IMPLANT BASED ON AGEING TIME VARIATIONS

Anjar Oktikawati, Rini Riastuti, Damisih Damisih, I. Nyoman Jujur, Agus Paul Setiawan Kaban

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The alternative Ti-6Al-7Nb alloy has gained extensive progression due to its ability to eliminate the cytotoxicity of vanadium (V) in Ti-6Al-4V alloy for orthopedic implants. The production of titanium alloys by centrifugal casting shows significant potential to reduce costs. Heat treatment and aging can tailor the microstructure and improve the corrosion resistance of titanium alloys. This study examines the effects of various ageing times on the microstructure and corrosion resistance of a centrifugal cast Ti-6Al-7Nb alloy that has previously been heated and treated at a temperature of 1050 °C, and subsequently cooled to room temperature in argon atmosphere gas. Ageing was carried out at a temperature of 550 °C with variable times of 0, 4, 6, and 8 hours. The surface morphology, metal phase changes, and electrochemical characterization were tested using an optical microscope (OM), X-ray diffraction (XRD), potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS). The basket-weave microstructure is formed where globularization oc-curs in some phases as ageing time increases. Increasing the FWHM α value is correlated with increasing the amount of α′ martensite phase. As an ageing time enhances, the temperature might offer a greater driving constrain for the nucleation and expansion of the lamellar phase (α). Ageing of 8 hours has the lowest corrosion rate, 0.0023 mpy and highest corrosion resistance, 90457 Ω∙cm2, due to the partially bimodal structure and grain refinement with a smallest grain size of 327.87 μm. Tafel polarization results show that all passivated samples are stable in the Solution Body Fluid (SBF).

Original languageEnglish
Pages (from-to)6-15
Number of pages10
JournalEastern-European Journal of Enterprise Technologies
Volume2
Issue number12-128
DOIs
Publication statusPublished - 2024

Keywords

  • ageing time
  • corrosion resistance
  • microstructure
  • orthopedic implant
  • titanium alloy

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