Magnetostriction of Fe–Cr and Fe–Cr–B Alloys.

The room temperature magnetostriction of polycrystalline Fe100–xCrx alloys annealed at 800 °C was investigated as a function of Cr content varying from 10 to 30 at.% Cr. All alloys exhibited a single bcc \alpha -Fe–Cr phase with a disordered A2 structure. With increasing Cr concentration, the grain shape became very elongated. The greatest total magnetostriction value of 70 \times 10^{-6} was obtained in the direction of the elongated grains for 30% of Cr. We also investigated the effect of B addition on the magnetostriction and structural properties of the alloy Fe80Cr20. Although the addition of B was expected to form the Fe2B phase, the B-added Fe–Cr alloy forms a ternary phase (FezCr1–z)2B ( 0 < z < 0.55$ ), a weak magnetic phase. [ABSTRACT FROM AUTHOR]