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Proceedings Paper

Unidirectional solidification of Tb-Fe giant magnetostrictive alloys under microgravity conditions
Author(s): Kazuyoshi Ishida; Takeshi Haraki; Hirohisa Uchida; Yoshihito Matsumura; Toshiro Kuji; Hideki Minagawa; Takeshi Okutani; Keiji Kamada
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Paper 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). TbFe1.83 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.

Paper Details

Date Published: 13 November 2002
PDF: 8 pages
Proc. SPIE 4934, Smart Materials II, (13 November 2002); doi: 10.1117/12.469179
Show Author Affiliations
Kazuyoshi Ishida, Tokai Univ. (Japan)
Takeshi Haraki, Tokai Univ. (Japan)
Hirohisa Uchida, Tokai Univ. (Japan)
Yoshihito Matsumura, Tokai Univ. (Japan)
Toshiro Kuji, Mitsui Mining and Smelting Co., Ltd. (Japan)
Hideki Minagawa, National Institute of Advanced Industrial Science and Technology (Japan)
Takeshi Okutani, National Institute of Advanced Industrial Science and Technology (Japan)
Keiji Kamada, Japan Space Utilization Promotion Ctr. (Japan)

Published in SPIE Proceedings Vol. 4934:
Smart Materials II
Alan R. Wilson, Editor(s)

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