Fe－(4∼6 wt%)Si-(2∼5 wt%)Al系合金単結晶の磁気異方性と磁歪

Temperature dependences of magnetocrystalline anisotropy constant K1 and magnetostriction constants λ100 and λ111 were measured for Fe-Si-Al alloy single crystals annealed at 1200°C or quenched from 1200°C around the composition region 4∼6 wt%Si, 2∼5 wt%Al, bal. Fe. The crystal structure of these single crystals was determined by electron diffraction. The large difference in the magnitude of K1=9.1×103 erg/cm3 for 4.8 wt% Si, 5.0 wt% Al, bal. Fe alloy and K1=1.1×105 erg/cm3 for 4.7 wt%Si, 3.8 wt%Al, bal. Fe alloy at room temperature was found to be connected with the difference in their crystal structures. The lines of λ100=0 and λS=0 were determined as a function of composition. The concentration of second peak alloy for μm locates along the line of λ100=0. Moreover, the second peak alloy may have the D03 structure.