Abstract
Abstract X-ray diffraction studies carried out on the Tb 0.27 Dy 0.73 Fe 2− x Al x (0 ≤ X ≤ 0.20) alloy system revealed that all the compositions investigated retained the C-15 cubic Laves phase structure. The alloys were prepared by arc melting followed by zone melting using an induction furnace. The d.c. field dependence of the magnetostrictive strain has been measured at room temperature. The incremental relative permeability and the magnetomechanical coupling coefficient have been obtained as functions of the external static magnetic field at room temperature. A comparison of the magnetostrictive responses indicates that the saturation magnetostriction as well as the magnetomechanical coefficient decrease with increasing Al concentration. A slight lowering of the dynamic strain coefficient with Al content is attributed to a reduction in magnetoelastic coupling, also seen in a lower magnetomechanical coupling coefficient.
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