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 Co 35 Cr 5 Fe 10 Ni 30 Ti 5 Al 7.5 Mn 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 Co 35 Cr 5 Fe 10 Ni 30 Ti 5 Al 7.5 Mn 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 Co 35 Cr 5 Fe 10 Ni 30 Ti 5 Al 7.5 Mn 7.5 HEA. The saturation magnetization and coercivity value is 83 emu/g and 6 Oe for as-synthesized Co 35 Cr 5 Fe 10 Ni 30 Ti 5 Al 7.5 Mn 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 Co 35 Cr 5 Fe 10 Ni 30 Ti 5 Al 7.5 Mn 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 Co 35 Cr 5 Fe 10 Ni 30 Ti 5 Al 7.5 Mn 7.5 HEA a promising soft magnetic material for industrial applications. • Synthesized single fcc phase for Co 35 Cr 5 Fe 10 Ni 30 Ti 5 Al 7.5 Mn 7.5 HEAs. • Enhanced Soft magnetic property found with the addition of Mn. • Significant enhancement in the value of Ms after annealing. • Better corrosion resistance with the addition of Mn in Co 35 Cr 5 Fe 10 Ni 30 Ti 5 Al 15 HEA.