Structure, corrosion resistance and nanomechanical properties of CoCrFeNiX (X=Nb,Mo,B,Si) high entropy alloys
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22350%2F25%3A43934250" target="_blank" >RIV/60461373:22350/25:43934250 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.electacta.2025.145933" target="_blank" >https://doi.org/10.1016/j.electacta.2025.145933</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.electacta.2025.145933" target="_blank" >10.1016/j.electacta.2025.145933</a>
Alternative languages
Result language
angličtina
Original language name
Structure, corrosion resistance and nanomechanical properties of CoCrFeNiX (X=Nb,Mo,B,Si) high entropy alloys
Original language description
In this work, the four high entropy CoCrFeNiX alloys (X=Nb,Mo,B,Si) were prepared by induction melting to comparatively analyze their structure, nanomechanical properties, and corrosion resistance. The CoCrFeNiNb and CoCrFeNiMo alloys were composed of FCC solid solution and intermetallic phases (TM)<inf>2</inf>Nb and Cr-Mo-TM. In the case of the CoCrFeNiB alloy, a complex phase structure was revealed, consisting of FCC solid solution and three types of borides. In turn, the addition of Si substantially altered the phase composition of the CoCrFeNi alloy, resulting in the formation of two intermetallic phases. The corrosion behaviour of the alloys was studied in 3.5 and 5% NaCl solutions. The highest corrosion resistance was characteristic for the CoCrFeNiSi alloy, which showed the most uniform chemical element distribution, showing the lowest corrosion current density and the highest positive corrosion potential values in both environments used. For measurements in a 5% NaCl solution, i<inf>corr</inf> and E<inf>corr</inf> were equal to 0.24 μA/cm2 and -0.136 V. The least favourable corrosion parameters were recorded for the CoCrFeNiMo alloy. The results of EIS measurements confirmed the high protective abilities of the passive film formed on the CoCrFeNiSi alloy surface. The SKPFM map of the Volta potential differences showed that the Cr-Mo-TM phase with a high molybdenum content was less noble than the FCC solid solution. Similarly, the Ni-rich FCC phase was more noble compared to the (TM)<inf>2</inf>Nb phase with a high niobium content for the CoCrFeNiNb alloy. The highest strength properties were shown by the alloys with the addition of metalloids. For the CoCrFeNiSi alloy, the highest nanohardness value was obtained (above 15 GPa), while the CoCrFeNiB showed the highest Young's modulus (above 275 GPa). © 2025 Elsevier Ltd
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10400 - Chemical sciences
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ELECTROCHIMICA ACTA
ISSN
0013-4686
e-ISSN
1873-3859
Volume of the periodical
525
Issue of the periodical within the volume
Neuveden
Country of publishing house
GB - UNITED KINGDOM
Number of pages
17
Pages from-to
145933
UT code for WoS article
001458442100001
EID of the result in the Scopus database
2-s2.0-105001016936