Structure, corrosion resistance and nanomechanical properties of CoCrFeNiX (X=Nb,Mo,B,Si) high entropy alloys

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Structure, corrosion resistance and nanomechanical properties of CoCrFeNiX (X=Nb,Mo,B,Si) high entropy alloys

Popis výsledku v původním jazyce

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)&lt;inf&gt;2&lt;/inf&gt;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&lt;inf&gt;corr&lt;/inf&gt; and E&lt;inf&gt;corr&lt;/inf&gt; 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)&lt;inf&gt;2&lt;/inf&gt;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&apos;s modulus (above 275 GPa). © 2025 Elsevier Ltd

Název v anglickém jazyce

Structure, corrosion resistance and nanomechanical properties of CoCrFeNiX (X=Nb,Mo,B,Si) high entropy alloys

Popis výsledku anglicky

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)&lt;inf&gt;2&lt;/inf&gt;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&lt;inf&gt;corr&lt;/inf&gt; and E&lt;inf&gt;corr&lt;/inf&gt; 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)&lt;inf&gt;2&lt;/inf&gt;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&apos;s modulus (above 275 GPa). © 2025 Elsevier Ltd

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10400 - Chemical sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ELECTROCHIMICA ACTA

ISSN

0013-4686

e-ISSN

1873-3859

Svazek periodika

525

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

145933

Kód UT WoS článku

001458442100001

EID výsledku v databázi Scopus

2-s2.0-105001016936