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Registration Number

0224U002969, 0121U109213 , R & D reports

Title

Physico-chemical regularities of processes of obtaining castings from high-entropy alloys

Head

Verkhovliuk Anatolii M., Доктор технічних наук

Registration Date

19-03-2024

Organization

Physico-technological institute of metals and alloys National academy of Sciences of Ukraine

Description

 The technique of FeNiCrCuAl and FeNiCrCuMn systems high-entropy alloys melting in air has been developed. X-ray phase analysis shows that the FeNiCrCuAl system high-entropy alloys consist of two solid solutions based on fcc and ordered bcc (B2) lattices, and high-entropy alloys of the FeNiCrCuMn system contain two or three fcc (A1) based solid solutions. Complex (Fe,Cr)7C3 carbides of hexagonal structure are also formed when the carbon content in these alloys is from 0.7 wt. %. It was determined that the HEAs, containing carbon and aluminum, have the highest hardness and the lowest plasticity among the alloys studied in the work. The high-entropy alloys, which have aluminum in their composition, demonstrate the best resistance to oxidation due to the formation of a dense Al2O3 oxide film. The Fe24.7Ni19.8Cr18.5Mn0.1Al12Cu21C3.2Si0.8 alloy has higher resistance to oxidation than the 08X18Н10 (AISI 304) corrosion-resistant high-alloy steel. The studied high-entropy alloys have a higher wear resistance than the standard wear-resistant steel of the 75ХФТЛ grade. The Fe24Ni20.4Cr14.5Mn18.5Cu22C0.4Si0.3 high-entropy alloy has the lowest coefficient of sliding friction among the alloys studied in the work, i.e. 0.243, and the counterbody material wear, which works in tandem with this HEA, has a minimum value of 0.060 mg/cm2.

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Kanibolotskyi Dmytro S.
Serhiienko Ruslan A.
Shcheretskyi Oleksandr A.