Multi-component alloys containing at least five elements in equimolar or near equimolar ratio are commonly known as High-Entropy Alloys. Despite the complex chemical composition, with the fulfilment of specific thermodynamic parameters, they are characterized by the existence of simple phases. During designing process of such materials VEC (Valance Electron Concentration) parameter is commonly used to predict the crystallographic structure of the alloy. Calculations are based on the percentage of individual elements and the number of each valence electron. Research presents the effect of chromium addition on the structure and microstructure of alloys from Al-Ti-Co-Ni-Fe-(Cr) system. The assumption is, that the addition of chromium will lower the value of the VEC parameter, and will results in the transition from FCC structure to FCC + BCC structure. Such crystallographic change should additionally lead to significant changes in the properties of these alloys, e.g. by hardness increasing.Keywords: High-Entropy Alloys, VEC parameter, structure, microstructure
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