## 4 Conclusions  
Focusing on the electrochemical and mechanical performances of B\({}_{4}\)C ceramics doped with varying concentrations (0.5%, 1%, 2% and 3%) of CoCrFeNiMo HEA, the principal findings are described as follows:  
* When CoCrFeNiMo high-entropy alloy is added to the B\({}_{4}\)C ceramic matrix, a denser structure is obtained. A more refined grain structure was obtained because of this doping procedure. HEA addition leads to a more compact configuration and the inhibition of grain expansion in comparison to monolithic B\({}_{4}\)C, resulting in notable microstructure alterations. Of all the samples studied, the smaller average grain size and the denser configuration were achieved in the 2% HEA concentration sample.
* Electrochemical tests revealed that corrosion resistance improved progressively with higher HEA content. The 3% HEA-doped B\({}_{4}\)C demonstrates the highest resistance in artificial seawater conditions. The enhanced performance is attributed to the formation of a more compact and protective passive layer, effectively mitigating material corrosion.
* The statistical microhardness analysis of all composites revealed that even though every sample followed a normal distribution (suggesting a homogeneous structure), the 0.5% and 3% HEA concentrations had a less uniform and predictable hardness distribution, which suggests ongoing microstructural adjustments. The Vickers hardness of the B4C-doped composites were higher as the HEA percentage increased, indicating a strict relation between doping and hardness.  
All the tests carried out clearly determine that increasing the HEA content implies better performance regarding corrosion resistance and mechanical properties. The 3% HEA B\({}_{4}\)C composite exhibited the best results across all different tests, while the 0.5% HEA B\({}_{4}\)C sample showed the poorest performance. The study finally determines the potential of CoCrFeNiMo HEA-doped B\({}_{4}\)C ceramics for applications that involve mechanical strength and corrosion resistance. It highlights the outstanding behavior of all composites in aggressive environments, especially the 3% HEA-doped composite.  
Conceptualization A.D.R.-C.; methodology, A.D.R.-C.; software, A.D.R.-C.; validation, J.C.M.-R. and G.G.; formal analysis, A.D.R.-C. and B.C.O.; investigation, A.D.R.-C.; resources, J.C.M.-R. and G.G.; data curation, A.D.R.-C.; writing--original draft preparation, A.D.R.-C.; writing--review and editing, A.D.R.-C.; visualization, A.D.R.-C.; supervision, J.C.M.-R. and G.G. All authors have read and agreed to the published version of the manuscript.  
This research was funded by European project 2023-1-RO01-KA220-HED-000159985: Smart Healthcare Engineering and Government of Gran Canaria project, with the reference PROID2024010003.  
Not applicable.  
The original contributions presented in this study are included in the article. Further inquiries can be directed to the corresponding author.  
We hereby acknowledge the European project 2023-1-RO01-KA220-HED-000159985: Smart Healthcare Engineering and Government of Gran Canaria project, with the reference PROID2024010003.  
The authors declare no conflicts of interest.