Unidirectional solidification of Tb-Fe giant magnetostrictive alloys under microgravity conditions

Kazuyoshi Ishida; Takeshi Haraki; Hirohisa Uchida; Yoshihito Matsumura; Toshiro Kuji; Hideki Minagawa; Takeshi Okutani; Keiji Kamada

doi:10.1117/12.469179

13 November 2002 Unidirectional solidification of Tb-Fe giant magnetostrictive alloys under microgravity conditions

Kazuyoshi Ishida, Takeshi Haraki, Hirohisa Uchida, Yoshihito Matsumura, Toshiro Kuji, Hideki Minagawa, Takeshi Okutani, Keiji Kamada

Author Affiliations +

Proceedings Volume 4934, Smart Materials II; (2002) https://doi.org/10.1117/12.469179
Event: SPIE's International Symposium on Smart Materials, Nano-, and Micro- Smart Systems, 2002, Melbourne, Australia

Abstract

The crystal growth of Tb-Fe giant magnetostrictive materials under microgravity (μG) and terrestrial gravity (1G) was investigated. The microgravity conditions were obtained by free fall in drop tower facility at the Japan Microgravity Center (JAMIC). TbFe_1.83 alloy with 1 gram and cubic form was prepared for unidirectional solidification under microgravity environment. The samples were melted just before drop and solidified by contact chill against a sample at the period of microgravity after dropping. The microstructure of μG sample was columnar structure and growth direction was aligned in thermal gradient. In 1G sample, the microstructure was weak aligned in thermal gradient. The composition was measured by EDX. The TbFe₃ phase was observed in 1G sample, and no TbFe₃ phase was observed in μG sample, caused by reduction of thermal convection in microgravity environment. In μG sample, the columnar structure that aligned thermal gradient was oriented orientation. The magnetostriction of parallel direction to the thermal gradient was larger than perpendicular direction in μG and 1G. The magnetostriction of μG sample, the measurement direction was parallel to the thermal gradient, was larger than 1G sample caused by microstructure.

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Kazuyoshi Ishida, Takeshi Haraki, Hirohisa Uchida, Yoshihito Matsumura, Toshiro Kuji, Hideki Minagawa, Takeshi Okutani, and Keiji Kamada "Unidirectional solidification of Tb-Fe giant magnetostrictive alloys under microgravity conditions", Proc. SPIE 4934, Smart Materials II, (13 November 2002); https://doi.org/10.1117/12.469179

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