Comparison of magnetoelastic properties between the [110] oriented Tb-x Dy1-xFe1.95 polycrystalline alloys with different Tb/Dy composition ratio under magnetomechanical loading

摘要

This paper presents comparison of magnetoelastic properties between the h [110] oriented TbxDy1-xFe1.95 polycrystalline alloys for x = 0.27, 0.3, 0.45 under coupled loading of magnetic field and compressive stress. The simultaneously measure are investigated for the magnetization and magnetostriction under applied magnetic field from -200 to 200 kA/m and compressive stress from 0 to 50 MPa along the rod axis at room temperature. The results show that, according to the increase of Tb concentration and compressive stress, the hysteresis, coercive force and magnetostriction hysteresis loops of TbxDy1-xFe1.95 allys increase rapidly and the distortion of the hysteresis loops occurs at higher compressive stress, especially Tb0.45Dy0.55Fe1.95 alloys, while the maximum relative permeability of Tb-x Dy1-x Fe-1.95 aloys mnotonously decrease. Meanwhile, the higher the Tb concentration the stronger is magnetostrictive "jump'' effect. For these experimental results, the effect of compressive stress and Tb/Dy ratio on magnetoelastic properties of TbxDy1- x Fe-1.95 alloys are coupling and remarkable. A tradeoff and optimization are very important for many engineering designs and applications.