〈112〉-Oriented crystals of the highly magnetostrictive alloys Tb 0.36 Dy 0.64 (Fe 1−x Co x ) 2 (x=0–0.20) and Tb 0.3 Dy 0.7 Fe 2 have been prepared by zone melting directional solidification method with growth velocities of 240 and 600mm/h. It is found that 〈112〉-oriented crystals were formed with dendritic-solidified morphologies. Narrower lamellar spacing is observed in samples obtained with higher growth velocity. Magnetostrictive properties were measured under various compressive pre-stresses at room temperature (20°C), elevated temperature (100°C) and cryogenic temperature (−80°C). Magnetostriction “jump” effect is less obvious in all Tb 0.36 Dy 0.64 (Fe 1−x Co x ) 2 〈112〉-oriented crystals at −80°C than at 20 and 100°C. The measurement results reveal that large magnetostriction in the 〈112〉-oriented polycrystalline materials of Tb 0.36 Dy 0.64 (Fe 1−x Co x ) 2 can be retained in a wide temperature range from −80 to 100°C.