A Fresh Perspective on Medium Entropy Alloys Applications as Coating and Coating Substrate

Abstract

In order to evolve as a society we need increasingly efficient technologies and implicitly materials with great performance that promote safety and sustainability. The discovery of high entropy alloys was received with much enthusiasm due to the possibility of designing new materials with improved properties, that could be used in applications that require extreme conditions or a very specific combination of properties. As the research in this area is continuously increasing and the results are very promising, this review focuses on the most recent investigations on medium entropy alloys (MEAs) applications, highlighting their properties, but taking into consideration other factors, such as economic and environmental factors. Additionally, considering the high cost associated with MEAs fabrication, MEA coatings are also explored, as they are nowadays regarded as a more convenient procedure to obtain the required properties for various substrate materials.

Technological Aspects and Performance of High Entropy Alloys with Potential Application in Dental Restorations and Reducing Implant Failure

“…Incorporating less common elements with unique properties in a small amount, typically less than 5%, generates a state of local disorder that contributes to exceptional properties such as enhanced resistance to corrosion, oxidation and abrasion [52,53]. These alloys, composed of multiple elements, exhibit special mechanical and thermal properties, including high strength, hardness, toughness and ultra-high fracture toughness [42]. The well-selected combination of elements in specific ratios leads to properties such as unique corrosion resistance in bioliquids and superior biocompatibility [54].…”

“…In the case of HEA implant materials, there are not only obvious drawbacks related to the costs of such materials but also technical, such as poor castability [26] and elemental segregation [39]. Several strategies are being researched and evaluated to address these issues, such as HEA coatings on cheaper substrates and different fabrication methods with highly controlled parameters [40][41][42][43][44].…”

A Modern Approach to HEAs: From Structure to Properties and Potential Applications

“…Traditional methods like severe plastic deformation (via cold rolling or equal channel angular pressing) enhance strength at the cost of ductility, suggesting the possibility of developing superfunctional materials that surpass traditional engineering materials in performance [16]. This advancement points towards a future where HEAs could play a critical role in various high-efficiency, advanced material applications, demonstrating the field's growing maturity and potential for innovation [8,17,18].…”

Complex Bioactive Chitosan–Bioglass Coatings on a New Advanced TiTaZrAg Medium–High-Entropy Alloy

“…The introduction of multi-principal metal alloys (MPEAs) [1] as new materials with high performance properties has been an answer to the needs involved in the development of new technologies. Initially, such alloys were divided based on their entropy values into high-entropy alloys (HEA) and medium-entropy alloys (MEAs) [2,3]. The research design concept of such materials permits the development of alloys with proposed desired characteristics that promote safety and sustainability in a large variety of scientific fields, despite the fact that they were initiated for use in extreme conditions.…”