Crystal orientation induced by high magnetic fields during peritectic reaction of alloys

Using Tb_0.27Dy_0.73Fe_1.95 as a model alloy, we generate (Tb, Dy)Fe₂ and (Tb, Dy)Fe₃ phases with preferred orientations. We study the mechanism that determines the preferred crystal orientation of a peritectic alloy under high magnetic fields. Adjusting the preparation parameters yields four Tb_0.27Dy_0.73Fe_1.95 alloys with respective 〈110〉, 〈111〉, 〈112〉, and 〈113〉 directions of the peritectic (Tb, Dy)Fe₂ phase parallel to the high magnetic field. The 〈112¯0〉, 〈0001〉, 〈101¯0〉, and 〈101¯3¯〉 directions of the corresponding primary (Tb, Dy)Fe₃ phase are parallel to the magnetic field. We deduce the orientation relationships (1¯11)//(0001) and [110]//[112¯0] for the (Tb, Dy)Fe₃ and (Tb, Dy)Fe₂ phases. The growth velocity and high magnetic field do not change the orientation relationships of these two phases. The high magnetic field induces the rotation of the primary (Tb, Dy)Fe₃ phase and then affects the orientation of the peritectic (Tb, Dy)Fe₂ phase. Magnetic torque induces stacking of the {0001} plane perpendicular to the magnetic field, meaning the c-axis of the primary (Tb, Dy)Fe₃ phase aligns parallel to the field. At this time, the {111} plane of the (Tb, Dy)Fe₂ phase grows perpendicular to the magnetic field, as reflected in the preferred orientation of the (Tb, Dy)Fe₂ phase along the 〈111〉 direction.