Measurement of Magnetic Field dependent Young's Modulus of Iron- Gallium Alloy in Flexural Mode

摘要

Iron-Gallium alloys have demonstrated high compressive stress sensitivity (～ 30 T/GPa) along with considerable tensile strength (～ 515 MPa) and Young's modulus (～ 65 GPa) thus making them attractive materials for magnetostrictive sensors. In this work, four-point bending test was performed on single crystal Fe_(84)Ga_(16) (Galfenol) under magnetic field to characterize its magneto-mechanical response in bending mode. The longitudinal and transverse strains (ε_([100]) and ε_([010])) obtained under different mechanical loads (P) and DC magnetic bias fields (H) were used to estimate material properties like average Young's modulus (E_([100])) and Poisson's ratio (v_([010])). The stress-dependent change in magneticinduction (B) at constant bias fields was obtained for different bending loads. The results of this study helps in understanding the behavior of and challenges related to Galfenol based magnetostrictive sensors which work in bending (flexural) mode.