快淬Fe81Ga19合金薄带的相结构和磁致伸缩

Phase Structure and Magnetostriction of Fe81Ga19 Melt-Spun Ribbons

摘要:

采用熔体快淬法制备Fe81Ga19合金薄带，研究薄带试样的相结构和磁致伸缩性能。XRD和M-TG结果表明，快淬态Fe81Ga19合金基体为Fe(Ga)无序固溶体相，并有微量非对称结构的DO3相析出，且薄带厚度方向[100]择优取向。当测量磁场垂直带面时，薄带试样沿带长方向的饱和磁致伸缩达–1830×10-6。Fe81Ga19合金薄带的巨磁致伸缩与其大的形状各向异性、熔体快淬时合金内部形成的非对称结构的DO3相及薄带厚度方向[100]择优取向相关

Abstract:

Fe81Ga19 alloy ribbons were prepared by melt-spinning. The phase structure and magnetostriction of ribbon samples were investigated by XRD and M-TG. The results show that the matrix of Fe81Ga19 ribbons was disordered Fe(Ga) solid solution, accompanied with a small amount of the second phase maintaining an unsymmetrical DO3 structure. The [100] preferred orientation was formed along the thickness direction. The maximum magnetostricton of –1830×10-6 was obtained when the magnetic field was applied normal to the ribbon plane. The shape anisotropy of ribbons, the unsymmetrical DO3 structure and the [100] preferred orientation are suggested to be responsible for the giant magnetostriction.