ВПЛИВ ВМІСТУ ВОЛЬФАРМУ НА ЗАКОНОМІРНОСТІ ФОРМУВАННЯ МІКРОСТРУКТУРИ ТА ФАЗОВОГО СКЛАДУ ПОРОШКІВ СПЛАВУ WXFECONI ПІД ЧАС МЕХАНІЧНОГО ЛЕГУВАННЯ

Abstract

This work investigates the synthesis of heavy high-entropy alloys WₓFeCoNi (x = 1, 1.5, 2) produced by mechanical alloying in a gasoline medium. It is shown that the equiatomic alloy WFeCoNi forms a dual-phase BCC/FCC structure without intermetallic compounds, whereas increasing the tungsten content to x = 1.5 reduces the configurational mixing entropy and enhances phase segregation. For the composition x = 2, the formation of tungsten carbide (WC) is established, resulting from the exceeded carbon solubility limit and the diffusion activation occurring during milling. The obtained results highlight the importance of controlling the W concentration and mechanical alloying conditions to tailor the microstructure and phase stability of heavy HEAs, which is promising for applications in high-temperature and highly loaded components.