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Deformation and grain orientation of polycrystalline hexagonal Ba-ferrite under uniaxial compressive load were studied. The polycrystalline Ba-ferrite deformed smoothly under a load of 200kg/cm2 at the temperatures ranging from 1100°C to 1300°C. For example, polycrystalline Ba-ferrite with the reduction ratio of height of 63% did not show any failure. In a polycrystalline Ba-ferrite with reduction ratio of 6.5%, any microstructural change was not observed. However, the microstructure of the polycrystalline Ba-ferrite changed with increasing reduction ratio. In the reduction ratio of 47.7%, the largely deformed grains which located near the outer surface of the pellet elongated to the perpendicular direction to the load. The polycrystalline Ba-ferrite with reduction ratio of 56.8% showed both grain elongation and grain growth. The orientation degree of c-plane of Ba-ferrite crystal to the perpendicular direction to the load axis increased with increasing reduction ratio. But, the contribution of grain elongation to the orientation degree of c-plane was less than the contribution of grain growth. When the polycrystalline Ba-ferrite with elongated grains was annealed at a higher temperature, the elongated grains grew topotaxially and showed the high orientation of c-plane, although the grains had not the original elongated shape after grain growth. These results showed that well-oriented polycrystalline Ba-ferrite with orientation degree more than F=0.9 could be obtained by the topotaxial grain growth of the elongated grains after annealing.

Deformation and Grain Orientation of Polycrystalline Hexagonal Ferrite under Uniaxial Compressive Load