Effect of Cooling Rate on Crystal Orientation, and Magnetic and Magnetostrictive Properties of TbFe2-Based Alloy Treated in Semisolid State Under a High Magnetic Field

The effect of cooling rate on crystal orientation, and the magnetic and magnetostriction properties of TbFe₂-based alloy treated in semisolid state, were investigated experimentally with and without the application of a 11.5-T high magnetic field. With this high-field application at low cooling rates, the preferred orientation of TbFe₂ phase changed direction from 〈113〉 to 〈110〉, which is parallel to the field direction, and the degree of 〈110〉 orientation of TbFe₂ phase F_〈110〉 decreased with increasing cooling rate. At a 60 °C/min rate, the orientation of TbFe₂ phase was randomly distributed. The maximum magnetization at 20 kOe of samples was almost the same whenever they were treated from the semisolid state with and without the high magnetic field at the same cooling rate. The maximum magnetization at 20 kOe of the sample increased with increasing cooling rate. Compared with the sample treated from the semisolid state without high magnetic field, the maximum magnetostriction at 10 kOe of the alloy was much higher when treated under the high magnetic field at the same cooling rate, and the magnetostriction of the samples at 10 kOe decreased with increasing cooling rate when the alloy was treated under high magnetic field.