The nonlinear magnetoelastic properties of < 110 > oriented Tb0.27Dy0.73Fe1.95 polycrystalline alloys under coupled magnetomechanical loading

Abstract

In the paper, the nonlinear magnetoelastic properties of composition Tb0.27Dy0.73Fe1.95 < 110 > oriented polycrystalline alloys are investigated under coupled loads of high magnetic field and compressive stress. The magnetization and magnetostriction are measured simultaneously under applied magnetic field from −800 to 800 kA/m and compressive stress from 0 to 25 MPa at room temperature. The strain coefficient and relative permeability are obtained by differential calculation from the experimental curves. The results show that the values of saturation magnetization (Ms) under different compressive stresses remain invariably constant in the region of the high magnetic field. The saturation magnetostriction (λs) increases with increasing compressive stress and reaches 1680 × 10−6 under 25 MPa. According to the increase of the compressive stress, the hysteretic loop area of magnetization and magnetostriction increases, while the maximum relative permeability and strain coefficient decrease. Additionally, the influence of the bias magnetic field on the mechanical property is taken into account. The stress-strain relationship is nonlinear and sensitive to the applied external magnetic fields along the axis of rod. The results obtained are a useful complement to the existing experiments for theoretical approaches and engineering applications.