Crystallogrphic Orientation and Magnetostrictive Properties of Directionally Solidified Laves-phase Tb_0.3Dy_0.7(Fe,M)_1.95 Alloys

The crystallographic orientation, morphologies and the relationship between the orientation and magnetostrictive properties of directionally solidified Laves-phasee Tb_0.3Dy_0.7 (Fe,M)_1.95 alloys by zone melting with high thermal gradient G_L wre studied.With increasing in Laves-phase growth vilocity at a high G_L given, it is shown that the solidification structure of alloys are from planar to cellular and to final dentritic structure,and meanwhile the crystallographic orientation of the Laves-phase are various correspondently. The optimum magnetostrictive properties of the alloys with perfect <112> axial orientation are obtained.