Effect of milling agent (methanol) on phase composition and structure of AlCoCrFeNiTi0,5 high entropy alloy powders

Igor Moravčík, Petra Hanusová, Jan Čupera, Ivo Dlouhý


In the last decade, high-entropy alloys (multi-principal element alloys) were developed as a new family of materials with high application potential. The effects of anti-agglomeration milling agent on the phase composition, structure, and size of non-equiatomic AlCoCrFeNiTi0,5 mechanically milled powders were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) with an energy dispersive spectroscopy (EDS) detector were utilized for microstructural analyses. During mechanical alloying (MA), a supersaturated Cr-based solid solution with BCC structure with significantly reduced grain size was formed after 10 hours of milling. During the annealing of milled powders, this solid solution decomposed into a mixture of four different phases. It was found that the use of milling agent had an extensive influence on the milled powders’ properties. Significant differences in phase composition, microstructure, and powder particle size were observed, with more favourable results in the case of milling in the presence of the milling agent.


High entropy alloys; Mechanical alloying; Annealing

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