Microstructure evolution and corrosion behaviour of a high Mo containing α + β titanium alloy for biomedical applications

Mahadule, Diksha and Khatirkar, Rajesh K and Gupta, Saurabh K and Gupta, Aman and Dandekar, Tushar R (2022) Microstructure evolution and corrosion behaviour of a high Mo containing α + β titanium alloy for biomedical applications. In: Journal of Alloys and Compounds, 912 . ISSN 09258388

PDF jou_all_com_912_2022.pdf - Published Version Restricted to Registered users only Download (12MB) | Request a copy

Abstract

In the present work, effect of heat treatment on microstructure and corrosion behaviour of a high Mo containing α + β titanium alloy (Ti-6Al-1 V-4Mo-0.1Si) has been investigated. Heat treatment results in the formation of wide variety of microstructure depending on the heating temperature (below or above the β transus) and cooling conditions. Martensite was observed after oil quenching (OQ), Widmanstatten α (αWS) + β after air cooling (AC) and lamellar α (αL) + β after furnace cooling (FC). The corrosion behaviour of the heat-treated specimens were studied in simulated body fluid (SBF) at 37 °C using open circuit potential-time (OCP), electrochemical impedance spectroscopy (EIS) and potentio-dynamic polarization tests. X-ray photoelectron spectroscopy (XPS) was used to investigate the chemical nature of the corroded surfaces. The study revealed that, in general, OQed samples had increased corrosion resistance than the ACed and FCed samples. XPS confirmed the presence of TiO2 and Al2O3 on the corroded sample. The alloy's improved corrosion resistance was attributed to stable inert TiO2 film. Samples heat treated at 950 °C were found to have better corrosion resistance in general.

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to the Elsevier Ltd.
Keywords:	Corrosion; EIS; Microstructure; Potentio-dynamic polarization; Titanium alloys
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	20 May 2022 10:18
Last Modified:	20 May 2022 10:18
URI:	https://eprints.iisc.ac.in/id/eprint/72312

Actions (login required)

View Item