The Effect Of Growth Velocity And Melting Zone Temperature On The Microstructure And Property Of The Tb_0.3Dy_0.7Fe_1.95 Magnetostrictive Alloy

The directionally solidified Tbo.3Dyo.7Fc 1.95 magnetostrictive alloy was prepared by The Zone Melting Directional Solidification Device. And the feature of the solid-liquid interface, the preferred orientation and the magnetostriction of the Tbo.3Dyo.7Fei.95 alloy with different growth velocities and different melting zone temperature were studied.The experimental results demonstrated that the solid-liquid interface of the TbQ.3Dyo.7Fe 1.95 alloy, was under the control of the factor of the crystal growth velocity and melting zone temperature, which has crucial influence on the preferred orientation. The preferred orientation can be obtained without difficulty by the float zone melting method. The low melting zone temperature is adverse to competitive growth, which can be speeded up with increasing the melting zone temperature. Homogenizing anneal is a requirement to attain the 'jump effect' of the magnetostriction. The 'Whole' magnetostriction value is higher than the 'local' magnetostriction value at large. The magnetostriction of Tbo.3Dyo.vFei.95 alloy presents hysteresis generally. Tbo.3Dyo.vFe 1.95 magnetostrictive alloy with unitary <110> orientation towards axis and homogeneous structure was achieved.