High Entropy Alloys for Medical Applications

A wide variety of metallic biomaterials have been developed so far, including various types of alloys. However, there is a strong need in the medical field for new solutions in what concerns metallic biomaterials with superior biocompatibility and mechanical properties in order to meet future requirements, including the recently developed high entropy alloys (HEAs). This chapter presents some characteristics of high entropy biocompatible metallic alloys produced in an electric-arc remelting furnace in argon inert atmosphere. The effects of the chemical elements used, the microstructural features, and some mechanical characteristics, both in the cast state or after some heat treatments, are highlighted

Synthesis, Processing, and Characterization of the Cobalt Alloys with Silicon Addition

The composition of the cobalt alloys contains only noncytotoxic elements (Cr, Si, and Mo) that ensure its biocompatibility, and consequently, the development and proliferation of cells at the implant/tissue interface. The cobalt alloy has an original composition with silicon addition and the proportion of the alloying elements was established so as to ensure a high biocompatibility and adequate physical-chemical characteristics for it to be used in various applications. Silicon is known to be a metal with a high biocompatibility; it can replace noble/non-noble metals in commercial alloys, thereby excluding the occurrence of any toxic corrosion products. We chose it as an alloying element because it confers good casting properties, has double role as hardener and oxidant, ensures an increase in the resistance to tear, and offers a proper fluidity in the liquid phase

Comparative study of Ti and Ti alloy for possible medical application

In the realm of modern medicine, the quest for innovation and improvement is relentless. One significant development that has transformed the landscape of medical devices and implants is the use of titanium and titanium alloys. Just as Titan stands as a resilient moon in the outer reaches of our cosmic neighborhood, titanium and its alloys have emerged as robust and versatile materials for a wide array of medical applications. From orthopedic implants to dental prosthetics, and even in cutting-edge biomedical engineering, titanium's exceptional combination of strength, biocompatibility, and corrosion resistance has made it an indispensable asset in modern medicine. Titanium and its alloys are not just elements on the periodic table; they are key elements in the quest for stronger, longer-lasting, and more effective medical treatments and devices

Effect of silicon contents on the properties of new titanium alloy

The use of prostheses promotes the increase of well-being in the population and that is why nowadays we are trying to better understand the results and success in achieving osseointegration of these elements. This gives way to the use of biomaterials. In order to define the characteristics of these materials, analyses and tests are required to determine their behaviour when the material is to be used and applied as an implant. So this research mainly aims to evaluate how silicon influences the mechanical characteristics by comparing two novel titanium alloys

Corrosion behavior of new titanium alloy for biomedical applications

The biomedical field is in constant evolution and improvement, for such reason we’ve decided to search for a possible material to overcome the limitations of some of the most common biomaterials utilized, such as Titanium, known for its high biocompatibility and corrosion resistance and used for bone implants and bone fixation parts, or such as Zirconium, a material wuth good chemical stability and mechanical properties, with orthopedical and dental applications, our proposal is a material called R4, an alloy composed of Ti15Mo7Zr15TaSi, which we belive could one day overcome the previous materials in the biomedical field

Study of molybdenum stable oxide film in simulated body fluid

This study's main goal is to thoroughly compare the mechanical attributes and biocompatibility of the recently created titanium alloy Ti15Mo7Zr15Ta1Si (62% Ti, 15% Mo, 7% Zr, 15% Ta, 1% Si) to that of the pure metal Mo. The samples underwent a series of meticulous preparation procedures, including chip preparation, polishing, grinding, and cutting, to enable a thorough evaluation. These preparation steps were essential for ensuring the samples' consistency and uniformity, which allowed for accurate and reliable analyses of their mechanical and corrosionrelated properties. The samples' microstructure and surface morphology were also investigated using metallographic techniques, allowing a thorough examination of any potential flaws, grain boundaries, or phase compositions. Additionally, electrochemical tests were used to investigate the materials' corrosion resistance and electrochemical characteristics in environments that mimicked physiological conditions. The samples were subjected to a variety of electrochemical analyses, such as polarization curves and impedance spectroscopy, in order for the researchers to fully comprehend the corrosion behavior of the materials and their suitability for biomedical applications

Influence of silicon addition on the properties of new titanium alloys

The mechanical characteristics and electrochemical behavior of the new titanium alloys TiMoZr, TiMoZrSi0.5, TiMoZrSi0.75 and TiMoZrSi1 were studied to determine their microstructure, corrosion behavior and mechanical properties. Following the use of the appropriate procedures, metallographic analysis showed that both samples had biphasic and dendritic structures. According to electrochemical tests in body simulation fluid, the samples' corrosion resistance increases with decreasing silicon content since silicon-containing samples corrode more quickly. Electrochemical Impedance Spectroscopy measurements were performed at various potentials, and the acquired spectra show a two-time constant system, due to the presence of a double-layer passive film on the samples. The three-point bending test for both samples demonstrated that the values of modulus of elasticity are lower than those commercial alloys and nearly to the cortical human bone, and the microhardness test showed that the samples' surfaces had soft and hard phases

Preliminary studies of new Ti alloys with different Mo content

This work aims to investigate the mechanical characteristics and biocompatibility of two novel titanium alloys, Ti15Mo7Zr15Ta1Si and Ti20Mo7Zr15Ta0,75Si.These samples have previously undergone cutting, grinding, polishing, and chipping. The studied samples were subjected to electrochemical, metallographic and corrosion behavior. Ti15Mo7Zr15Ta1Si and Ti20Mo7Zr15Ta0.75Si, the study samples, have demonstrated high corrosion potentials, lower corrosion rates, and consequently higher corrosion resistance. In summary, this study's data indicates that both alloys exhibit good corrosion behavior