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Title: Effects of nickel content on the microstructure, microhardness and corrosion behavior of high-entropy AlCoCrFeNix alloys
Authors: López Ríos, Miguel 
Socorro Perdomo, Pedro Pablo 
Voiculescu, I.
Geanta, V.
Crăciun, V.
Boerasu, I.
Mirza Rosca, Julia Claudia 
UNESCO Clasification: 330307 Tecnología de la corrosión
331103 Instrumentos para odontología
331110 Instrumentos médicos
Keywords: Chemistry
Materials science
Issue Date: 2020
Journal: Scientific Reports 
Abstract: In this study the effect of three different nickel concentration on the microstructure, hardness and corrosion properties of high entropy alloys (HEAs) from AlCrFeCoNi system as an alternative material for medical instruments fabrication was investigated. The analyzed HEAs were AlCrFeCoNix obtained by vacuum arc remelting from high purity raw materials and having nickel atomic ratio x = 1.0, 1.4 and 1.8. The microscopy examination revealed the dendritic morphology for the reference alloy (AlCrFeCoNi) and that the extent of the interdendritic areas increased with the concentration of nickel while Cr was more segregated in the interdendritic areas than in dendrites. Hardness values decreased as the percentage of nickel increased due to the dissolution of the precipitates in a nickel-rich matrix and consequently the formation of continuous solid solutions. The corrosion properties of the synthesized HEAs were evaluated using a potentiodynamic polarization method. The alloys were immersed in Simulated Body Fluid during one week and the corrosion parameters were recorded. The low corrosion rates, low corrosion currents and high polarization resistance attest the good stability of these HEAs in simulated biological environment indicating their possible use for surgical and dental instruments.
ISSN: 2045-2322
DOI: 10.1038/s41598-020-78108-5
Source: Scientific Reports [EISSN 2045-2322], v. 10 (1), 21119, (Diciembre 2020)
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