Abstract
In this paper, we investigated the possibility of preparation of TbFe2 giant magnetostrictive alloys under a microgravity condition using 6 m drop-tube system on basis of a feasibility study by JAMIC drop-tower. The diameters of TbFe2 alloy droplets varied from 1.1 to 2.1 mm were obtained. The magnetostriction of 1.1 mm droplet shows the highest value of about 1600 ppm at external magnetic field of 15 kOe. The magnetostriction of TbFe2 droplets increased with decreasing diameter. It was suggested that a cooling rate during free-fall in helium gas atmosphere and oil quenching influenced the magnetostriction of the samples. We concluded that 6 m drop-tube system could be potential the continuous preparation process for high performance TbFe2 giant magnetostrictive alloys.
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