Resumo:
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.
