Microstructure and Mechanical Properties of Al–Co–Cr–Fe–Ni Base High Entropy Alloys Obtained Using Powder Metallurgy

Łukasz Rogal; Zbigniew Szklarz; Piotr Bobrowski; Damian Kalita; Grzegorz Garzeł; Anna Tarasek; Marcin Kot; Maciej Szlezynger

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자료유형: 학술저널

저자정보: Łukasz Rogal (Polish Academy of Sciences) Zbigniew Szklarz (AGH University of Science and Technology) Piotr Bobrowski (Polish Academy of Sciences) Damian Kalita (Polish Academy of Sciences) Grzegorz Garzeł (Polish Academy of Sciences) Anna Tarasek (Polish Academy of Sciences) Marcin Kot (AGH-University of Science and Technology) Maciej Szlezynger (Polish Academy of Sciences)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.25 No.4

발행연도: 2019.1

수록면: 930 - 945 (16page)

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Four diff erent compositions of high entropy alloys based on Al–Co–Cr–Fe and Al–Co–Cr–Fe–Ni systems were preparedusing mechanical alloying and consolidation by spark plasma sintering. The chemical compositions of the studied alloyswere experimentally selected to obtain a BCC solid solution and mixtures of BCC with FCC. The microstructure of theAl25Co25Cr25Fe25 (all in at%) high entropy alloy consisted of a matrix with a high concentration of Al, Co and Fe, in whichspherical grains (50–200 nm) enriched in Cr were embedded. Both the matrix and grains had body centered cubic structures. The addition of nickel to a four-element system led to the formation of a multiphase composition. The microstructure of theAl20Co20Cr20Fe20Ni20, Al10Co30Cr20Fe35Ni5 and Al15Co30Cr15Fe40Ni5 HEAs consisted of fi ne grains measuring50–500 nm composed of: AlNi-B2, BCC phase, FCC or BCC solid solutions and σ-sigma phase, respectively. The complexstructure of the studied samples resulted in changeable mechanical properties. The highest compression strength of 3920 MPawas accompanied by an increased yield strength of 3500 MPa, and a low strain of 0.7%, for the Al25Co25Cr25Fe25 alloy. The addition of Ni led to the formation of plastic FCC phases responsible for a decrease in strength with increases in ductility,which, in the new non-equiatomic Al10Co30Cr20Fe35Ni5 high entropy alloy reached 6.3% at a yield strength of 1890 MPaand compression strength of 2230 MPa. The conducted abrasion studies revealed that non-equilibrium high entropy alloyshave the highest abrasion resistance.

#High entropy alloy · TEM studies · Mechanical properties · Mechanical alloying

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