Development of Fe_100-x(NiCoMn)_x magnetostrictive alloys with good mechanical properties

In this work, a series of Fe_100-x (NiCoMn)_x (13 ≤ x ≤ 45, at.%) cast alloys are developed. The mechanical properties and magnetostriction are intimately related to the phase constituent and crystal structure of these alloys. In the body-centered-cubic phase region (x < 25), the magnetostriction and tensile strength are increasing monotonically with increasing x value, both of which drop when the face-centered-cubic phase appears. The crystallography relationship between the face-centered-cubic and body-centered-cubic phase satisfies the Kurdjumov-Sachs relationship. In Fe₇₅(NiCoMn)₂₅ polycrystalline alloy, a magnetostriction of 50 ppm with a tensile strength more than 1000 MPa is achieved.