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New Eutectic High-Entropy Alloys Based on Co–Cr–Fe–Mo–Ni–Al: Design, Characterization and Mechanical Properties

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Abstract

New eutectic high-entropy alloys based on novel (CoqCrvFewMoyNiz)100−xAlx alloy systems were designed using both thermodynamic and computational approaches. After considering 324 equilibrium diagrams, ten potential eutectic compositions were determined to possess a eutectic point comprising FCC and B2 phases. (Co40Cr10Fe5Mo5Ni40)82,2Al17.8 was found to have a fully eutectic structure through experimental analysis, which had a negligible error (0.23%) compared to that of the computational modeling. The XRD patterns showed that the alloy was composed of only FCC and B2 phases (with volume fractions of 73.4% and 26.6%, respectively) and did not contain σ phase, which was predicted by the computational model to appear at low temperatures. Among all other alloys, the hypereutectic (18 at% Al) alloy exhibited the highest compressive yield strength (729 MPa) and ultimate compressive strength (2844 MPa), and the hypoeutectic (16 at% Al) alloy had the highest compressive ductility (~ 39%). For all fabricated alloys (hypoeutectic, eutectic, and hypereutectic), the compressive strength and strain exceeded 2514 MPa and 27%, respectively.

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Acknowledgements

Financial assistance from The Scientific and Technological Research Council of Turkey is gratefully acknowledged (Project No: MAG 216M063).

Author information

Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Eskisehir Osmangazi University, Eskisehir, 26480, Turkey

    Hakan Gasan

  2. Institute of Science, Eskisehir Osmangazi University, Eskisehir, 26480, Turkey

    Akin Ozcan

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  1. Hakan Gasan
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  2. Akin Ozcan
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Correspondence to Hakan Gasan.

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Appendices

Appendix 1

Appendix 1 includes the equilibrium phase diagrams of 10 EHEAs based on (CoqCrvFewMoyNiz)100−xAlx system designed by TCHEA2 database of Thermo-Calc program using console mode. See Figs. 9, 10, 11, 12, 13, 14, 15, 16, 17 and 18.

Fig. 9
figure 9

Calculated equilibrium phase diagram of (Co15Cr20Fe20Mo5Ni40)84.89Al15.11 EHEA

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Fig. 10
figure 10

Calculated equilibrium phase diagram of (Co20Cr20Fe15Mo5Ni40)84,61Al15,39 EHEA

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Fig. 11
figure 11

Calculated equilibrium phase diagram of (Co20Cr20Fe20Mo5Ni35)85,33Al14,67 EHEA

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Fig. 12
figure 12

Calculated equilibrium phase diagram of (Co25Cr20Fe15Mo5Ni35)85,02Al14,98 EHEA

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Fig. 13
figure 13

Calculated equilibrium phase diagram of (Co30Cr15Fe10Mo5Ni40)83,72Al16,28 EHEA

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Fig. 14
figure 14

Calculated equilibrium phase diagram of (Co35Cr10Fe10Mo5Ni40)83,24Al16,76 EHEA

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Fig. 15
figure 15

Calculated equilibrium phase diagram of (Co35Cr15Fe5Mo5Ni40)83,01Al16,99 EHEA

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Fig. 16
figure 16

Calculated equilibrium phase diagram of (Co35Cr15Fe10Mo5Ni35)84,09Al15,91 EHEA

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Fig. 17
figure 17

Calculated equilibrium phase diagram of (Co40Cr10Fe5Mo5Ni40)82,43Al17,57 EHEA

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Fig. 18
figure 18

Calculated equilibrium phase diagram of (Co40Cr15Fe5Mo5Ni35)83,35Al16,65 EHEA

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Appendix 2

The Scheil solidification simulation and property diagrams helps to understand the phase content and solidification sequence of HEAs. The Scheil solidification simulation and property diagrams of designed EHEAs have been prepared using TCHEA2 database of Thermo-calc program. See Figs. 19, 20, 21, 22, 23, 24, 25, 26, 27 and 28.

Fig. 19
figure 19

a Property diagram and b solidification simulation of (Co15Cr20Fe20Mo5Ni40)84.89Al15.11 EHEA

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Fig. 20
figure 20

a Property diagram and b solidification simulation of (Co20Cr20Fe15Mo5Ni40)84,61Al15,39 EHEA

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Fig. 21
figure 21

a Property diagram and b solidification simulation of (Co20Cr20Fe20Mo5Ni35)85,33Al14,67 EHEA

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Fig. 22
figure 22

a Property diagram and b solidification simulation of (Co25Cr20Fe15Mo5Ni35)85,02Al14,98 EHEA

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Fig. 23
figure 23

a Property diagram and b solidification simulation of (Co30Cr15Fe10Mo5Ni40)83,72Al16,28 EHEA

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Fig. 24
figure 24

a Property diagram and b solidification simulation of (Co35Cr10Fe10Mo5Ni40)83,24Al16,76 EHEA

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Fig. 25
figure 25

a Property diagram and b solidification simulation of (Co35Cr15Fe5Mo5Ni40)83,01Al16,99 EHEA

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Fig. 26
figure 26

a Property diagram and b solidification simulation of (Co35Cr15Fe10Mo5Ni35)84,09Al15,91 EHEA

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Fig. 27
figure 27

a Property diagram and b solidification simulation of (Co40Cr10Fe5Mo5Ni40)82,43Al17,57 EHEA

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Fig. 28
figure 28

a Property diagram and b solidification simulation of (Co40Cr15Fe5Mo5Ni35)83,35Al16,65 EHEA

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Gasan, H., Ozcan, A. New Eutectic High-Entropy Alloys Based on Co–Cr–Fe–Mo–Ni–Al: Design, Characterization and Mechanical Properties. Met. Mater. Int. 26, 1152–1167 (2020). https://doi.org/10.1007/s12540-019-00515-9

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