Caracterização microestrutural e atividade antimicrobiana da liga equiatômica multicomponente MoNbNiTiZr

Abstract

In order to attend the growth of the biomaterials market, scientific research and technological advances involving these materials are in evidence, with the objective of complementing the use of existing alloys and materials. From 2022 to date, more than 2500 papers have been published in PubMed involving biomaterials, according to the National Library of Medicine - National Center for Biotechnology Information. It is known that traditional biomaterials, such as CoCrMo alloys, Ti and stainless steel, have limitations and thermodynamic instability in biological environments. One of the alternatives for better mechanical properties along with biocompatibility is the development and study of multicomponent alloys, for their microstructural characteristics and promising properties. As a result, researchs has reported interesting results for multicomponent alloys, such as better anticorrosive performance compared to traditional biomedical alloys, in addition to more adequate Young’s modulus and hardness and good cell viability. This work proposed the feasibility study of the equiatomic MoNbNiTiZr high-entropy alloy (multicomponent) for biomedical applications. For this purpose, microstructural characterization by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM/EDS), Vickers microhardness test and evaluation of the behavior evaluation of the high-entropy alloy compared to cp-Ti in antimicrobial activity assays with S. aureus and S. aureus HU25 bacteria. The results indicated that the MoNbNiTiZr alloy is biphasic formed by dendritic and interdendritic regions, with BCC and HCP structures, respectively. As for microhardness, the alloy showed 576.5 HV. This value stands out among other multicomponent alloys in the literature for biomedical applications. For antimicrobial activity, the equimolar alloy showed greater resistance to S. aureus and S. aureus HU25 biofilm than cp-Ti.