Cost-effective synthesis and thermomechanical processing of AlxCoCrFeNiCuy (x&y=0.5,1) high-entropy alloys

Faruk Kaya, A. Albek Erşan, Esra Çayır, Tuğçe Kırım, Özgür Duygulu, G. İpek Selimoğlu*, Bora Derin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study investigates the cost-effective synthesis and thermomechanical processing of AlxCoCrFeNiCuy (x&y = 0.5,1) high-entropy alloys through cold (CR) and hot rolling (HR). The alloys were synthesized using a thermochemical modelling-assisted aluminothermic non-centrifugal, self-propagating high-temperature synthesis (SHS) method, which is reported for the first time in the literature. Remelting and suction casting were conducted via vacuum arc melting upon the compositional verification through x-ray fluorescence (XRF) and energy dispersive spectroscopy (EDS) analyses. The deformabilities and hardness values of the alloys were correlated with microstructural changes that were analysed through scanning and transmission electron microscopy (SEM, TEM). Among the master alloys, FCC-A1 based Al0.5CoCrFeNiCu0.5 (Al0.5Cu0.5) and Al0.5CoCrFeNiCu (Al0.5Cu1.0) alloys exhibited highest cold deformability (145% and 170%, respectively), accompanied by significant work hardening (114% and 108% increase in hardness, respectively), primarily attributed to dislocation-dislocation interactions. It has been demonstrated for the first time that equiaxed single phase (FCC-A1) Al0.5CoCrFeNiCu0.5 high-entropy alloy can be obtained through the CR + annealing. The alloys exhibited reduced hot formability (62% and 85%, respectively) partly due to the formation of Cr-rich sigma phase instead of the Al-Ni rich B2 phase, most notable in the Al0.5Cu0.5 alloy, contrary to the CALPHAD simulations. This led to increased hardness in the alloys through precipitation hardening, achieving similar hardness values as those obtained through cold rolling (CR) with less deformation. The findings support the conclusion that the presented integrated processing strategy offers a cost-efficient means of producing Al0.5CoCrFeNiCuy alloys with enhanced mechanical and chemical properties for various engineering applications by the selection of cold and hot rolling routes.

Original languageEnglish
Article number128554
JournalMaterials Chemistry and Physics
Volume311
DOIs
Publication statusPublished - 1 Jan 2024

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Funding

The authors would like to thank to M.Sc. Sajjad Aliakbarlu for his support throughout this study. Additionally, the authors are pleased to acknowledge the financial support from The Scientific and Technological Research Council of Turkey (TUBITAK, Project No: 119M086 and 1919B012107247 ).

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu1919B012107247, 119M086

    Keywords

    • Combustion synthesis
    • Hardness
    • High-entropy alloys
    • Microstructure
    • Rolling
    • SHS
    • Thermochemical modelling
    • Thermomechanical treatment

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