Phase Composition, Microstructure and Mechanical Properties of AlCrCoCuFeNiх High-Entropy Alloys System
DOI:
https://doi.org/10.20535/1810-0546.2014.2.60399Keywords:
High-entropy alloy, Solid solution, Electron concentration, Microstructure, MicrohardnessAbstract
In this study, the AlCrCoCuFeNiх (where х = 0; 0,5; 1; 2 and 3) high-entropy alloys were prepared by vacuum arc melting and their phase composition, microstructures and mechanical properties were investigated. According to X-Ray analysis data, phase composition of alloys depending on Ni content. It was found that the structure transformed from mixture B2+FCC solid solutions into FCC solid solution with the increase of Ni content. Quantity of BCC phase solid solution is decreased with increasing Ni content, and, respectively, the quantity of FCC phase solid solution increases. Also, the lattice period of the FCC solid solution increases with decreasing Nickel content. Microstructure and chemical composition of dendritic and interdendritic regions were investigated by using scanning electron microscopy. Interdendritic region depending on the contents of Ni has a high content of Cu. Cu-rich phase has the FCC solid solution structure, and depleted Cu phase has the BCC solid solution structure. The maximum hardness has an alloy that contains no nickel.References
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