Abstract
CoCrFeNiX (X = Cu, Mn) equiatomic high-entropy alloys (HEAs) were prepared through mechanical alloying (MA) followed by sintering at moderate temperature. The prepared HEAs were subjected to X-ray diffraction and microscope techniques to evaluate their phase evolution, microstructure, and elemental composition. Alloyed CoCrFeNiCu powder consists of two face centered cubic (FCC) phases (FCC1 and FCC2), whereas, CoCrFeNiMn powder showed a major FCC phase with a minor body centered cubic (BCC) phase. After sintering, bulk CoCrFeNiMn alloy showed only a single solid solution FCC phase, and the bulk CoCrFeNiCu still contained dual FCC phases. The elemental composition analysis revealed that both HEAs are equiatomic in composition. The average microhardness of CoCrFeNiCu and CoCrFeNiMn HEAs was 85 ± 15 HV and 147 ± 20 HV, respectively. It was observed that the presence of Cu in CoCrFeNiCu reduces the hardness of the HEA due to segregation. This study demonstrates the influence of the fifth metal on the phase evolution, microstructure, and mechanical properties of the HEAs.
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