Electrochemical characteristic and microstructure of Ti-6Al-7Nb alloy by centrifugal casting for orthopedic implant based on ageing time variations

Authors

DOI:

https://doi.org/10.15587/1729-4061.2024.302614

Keywords:

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

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 occurs 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). This work can be used as a starting point for developing microstructural evolution in titanium alloys

Author Biographies

Anjar Oktikawati, Universitas Indonesia

Postgraduate Student

Department of Metallurgy and Material Engineering

Rini Riastuti, Universitas Indonesia

Profesor of Engineering, Lecturer

Department of Metallurgy and Material Engineering

Damisih Damisih, National Research and Innovation Agency (BRIN)

Master of Engineering, Researcher

Center of Technology for Material

I Nyoman Jujur, National Research and Innovation Agency (BRIN)

Doctor of Engineering, Researcher

Center of Technology for Material

Agus Paul Setiawan Kaban, Universitas Indonesia

Doctoral student, Researcher

Prof. Johny Wahyuadi Laboratory

Department of Metallurgical and Materials Engineering

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Electrochemical characteristic and microstructure of Ti-6Al-7Nb alloy by centrifugal casting for orthopedic implant based on ageing time variations

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Published

2024-04-30

How to Cite

Oktikawati, A., Riastuti, R., Damisih, D., Nyoman Jujur, I., & Paul Setiawan Kaban, A. (2024). Electrochemical characteristic and microstructure of Ti-6Al-7Nb alloy by centrifugal casting for orthopedic implant based on ageing time variations. Eastern-European Journal of Enterprise Technologies, 2(12 (128), 6–15. https://doi.org/10.15587/1729-4061.2024.302614

Issue

Vol. 2 No. 12 (128) (2024): Materials Science

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Materials Science

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Copyright (c) 2024 Anjar Oktikawati, Rini Riastuti, Damisih Damisih, I Nyoman Jujur, Agus Paul Setiawan Kaban

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