Magnetostriction and corrosion resistance of Tb0.3Dy0.7(Fe1−xSix)1.95 alloys

Magnetostriction and corrosion resistance in 3.5% NaCl solution of as-cast Tb0.3Dy0.7(Fe1−xSix)1.95 (x = 0, 0.025 and 0.10) alloys were studied. With little Si addition, Tb0.3Dy0.7(Fe0.975Si0.025)1.95 alloy possesses both giant magnetostriction and improved corrosion resistance. The reason for improved corrosion resistance is suggested to be the increased natural corrosion potential Ecorr for the rare earth-rich phase and the reduced electrochemical potential difference between the rare earth-rich phase and the matrix phase in TbDyFeSi alloys.