Investigation on the formation of the preferred orientations in a TbDyFe alloy with directional solidification

The formation of the preferred orientations in a TbDyFe alloy was studied by transmission electron microscopy (TEM). It was found that there were several different preferred orientations in the experimental TbDyFe alloy with directional solidification. 〈110〉, 〈112〉 and 〈113〉 preferred orientations were observed in this alloy solidified by our self-made super high gradient temperature directional solidification device. The preferred orientations changed with the variation of the solidification conditions. Two {111} twinning systems resulted in the 〈110〉 preferred orientation and a single {111} twinning system resulted in the 〈112〉 preferred orientation. The twinning displacement was observed and this formatted the 〈113〉 preferred orientation.