Unidirectional solidification of magnetostrictive materials using a magnetic field in microgravity.
Unidirectional solidification experiments of magnetostrictive materials of Tb(0.3)Dy(0.7)Fe(2-x), (Terfenol-D) alloy in a static magnetic field and microgravity were performed using the Japan Microgravity Center (JAMIC) free-fall facilities. When the magnetic field strength was increased from 0T to 3.7 x 10(-2) T during unidirectional solidification in microgravity, a <111> crystallographic alignment of the grains dominated, and the maximum magnetostriction constant increased from 500 ppm to 2,000ppm. For unidirectional solidification in normal gravity, the maximum magnetostriction constant remained at 1,000 ppm for increases in the magnetic field.
Minagawa
Hideki
H
Microgravity Materials Laboratory, National Institute of Advanced Industrial Science and Technology, Tsukisamu-Higashi, Toyohira-ku, Sapporo, Japan. h-minagawa@aist.go.jp
Kamada
Keiji
K
Nagai
Hideaki
H
Nakata
Yoshinori
Y
Okutani
Takeshi
T