Speaker
Description
Ti6Al4V is the most widely used material for implant applications among titanium alloys that offer unique advantages over 316L stainless steels and Co-based alloys because of its low weight and high corrosion resistance. However, various interactions between implants and the biological environment can lead to the release of Al and V ions into the body fluid and raise long-term biocompatibility concerns.
With the fast development of new technologies and theories for exploring advanced materials, researchers have been attempted to discover a suitable alternative to conventional biomaterials. High entropy alloys (HEAs) with different compositional characteristics have attracted a lot of attention due to their potentially interesting properties for biomedical fields. Among different types of HEAs, the alloys consisting of non-toxic and non-allergenic refractory elements such as Ti, Ta, Hf, Nb, Zr, and Mo, known as refractory HEAs (RHEAs), could be potential candidates for biomedical applications.
This investigation was initiated to develop and study microstructure, mechanical properties, and corrosion behavior of non-equimolar Ti1.5ZrTa0.5Hf0.5Nb0.5 RHEA as bulk and coating in the simulated biological environment and to compare with those of the bare Ti6Al4V alloy. Bulk RHEAs were prepared by arc melting high purity elements on a water-cooled copper furnace in an Ar atmosphere. Ti1.5ZrTa0.5Hf0.5Nb0.5 RHEA thin films with a thickness of about 1.100 micron were deposited on Ti6Al4V substrate by RF magnetron sputtering. Phase and microstructural studies are carried out using XRD, SEM, and AFM. The hardness and elastic modulus of examines specimens were systematically investigated by nanoindentation with a Berkovich indenter. The corrosion behavior of the specimens was assessed using potentiodynamic polarization tests in the PBS electrolyte. The findings demonstrate that RHEAs, as a bulk and coating, could be prosperously used in biomedical applications.
| Speaker Country | Turkey |
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