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

In the present work, effect of heat treatment on microstructure and corrosion behaviour of a high Mo containing alpha + beta 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 beta transus) and cooling conditions. Martensite was observed after oil quenching (OQ), Widmanstatten alpha (alpha(WS)) + beta after air cooling (AC) and lamellar alpha (alpha(L)) + beta after furnace cooling (FC). The corrosion behaviour of the heat-treated specimens were studied in simulated body fluid (SBF) at 37 degrees 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 degrees C were found to have better corrosion resistance in general.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

The study investigated the effect of heat treatment on the microstructure and corrosion behavior of a high Mo containing titanium alloy. Different microstructures were observed depending on the heating temperature and cooling conditions. Heat-treated samples showed improved corrosion resistance, attributed to the presence of stable TiO2 film on the corroded surfaces. Samples treated at 950 degrees Celsius exhibited the best corrosion resistance overall.