Elastic properties and linear magnetostriction of Fe-P amorphous Invar alloys

Abstract

Fe100-xPx(13<or=x<or=20) amorphous ribbons were prepared by rapid quenching from the melt. The Delta E effect and the magnetostriction were measured in order to discuss the magnetoelastic properties. Young's modulus at zero field is almost independent of the temperature, indicating the Elinvar characteristics over a wide temperature range. On the other hand, Young's modulus at saturated field shows some anomalous temperature dependence and its magnitude is larger than the paramagnetic Young's modulus extrapolated linearly above the Curie temperature. The room-temperature values of Young's modulus for Fe-P amorphous alloys are smaller than those for Fe-B amorphous alloys. The concentration dependence of the saturation magnetostriction lambda s at room temperature indicates a broad maximum around 16 at.% P. The values of lambda s is slightly smaller than it is for Fe-B amorphous alloys, even though the Delta E effect of the former alloys is several times smaller than that of the latter alloys.