Magnetic and corrosion properties of Co35Cr5Fe10Ni30Ti5Al7.5Mn7.5 high entropy alloy

High Entropy Alloys (HEAs) exhibit exceptional mechanical properties, corrosion resistance, better high temperature stability, and higher electrical resistivity than conventional alloys due to the presence of multiple principal elements. In this study, we synthesized Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_7.5Mn_7.5 HEA through the mechanical alloying technique and investigated the effect of Mn addition for Al on the phase formation, magnetic, and corrosion properties. A single fcc phase has formed for Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_7.5Mn_7.5 HEA. After vacuum annealing at 700 °C for 2 h followed by RT cooling, a slight amount of new σ phase is formed along with the initial fcc phase for Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_7.5Mn_7.5 HEA. The saturation magnetization and coercivity value is 83 emu/g and 6 Oe for as-synthesized Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_7.5Mn_7.5 HEA. After annealing at 700 °C, the saturation magnetization significantly increased to 109 emu/g, whereas the value of coercivity remains the same. We also found good corrosion resistance for synthesized Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_7.5Mn_7.5 HEA in 1 M NaCl solution, and the corrosion rate is found to be 0.028 mm/y. Thus, the found the high value of Ms and extremely low corrosion rate makes the developed Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_7.5Mn_7.5 HEA a promising soft magnetic material for industrial applications.