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Iguchi, Yusuke*; Shibata, Yasuhiro*; Uchida, Yuta*; Huang, X.*; Ono, Masao; Okayasu, Satoru; Mashimo, Tsutomu
Advanced Materials Research, 15-17, p.639 - 642, 2007/00
Times Cited Count：2 Percentile：59.61(Thermodynamics)In this study, we investigate the crystalline states and conditions for the grain-refinement of Bi
Sb
alloy. It was considered under an ultra strong gravity field, the crystals were fine-grained from the primary grain sizes of several mm to several tens of mm, and the crystal growth followed with formation of graded-composition structure due to sedimentation of atoms along the direction of gravity. It was found that for the crystal-grain refinement in BiSb alloy the minimum gravitational field and the minimum time duration were at least 160,000 G and 10 hours, respectively at about 200 
C.
MnGa systemInoue, Kazuko*; Yamaguchi, Yasuo*; Ishii, Yoshinobu; Yamauchi, Hiroki; Shishido, Toetsu*
Materials Science Forum, 539-543, p.3267 - 3272, 2007/00
Magnetic field effect on a Heusler-type NiMnGa off-stoichiometric alloy having a martensitic transformation temperature around room temperature which is coincident with a Curie temperature has been investigated. The precess of martensitic transforation of a single crystal was investigated by neutron diffraction under the magnetic field up to 8 Tesla. It was found that the magnetic field, which is applied at a temperature near the transformation temperature, causes the martensitic transformation. The process of the transformation caused by the increase of magnetic field is quite similar to the process caused by the decrease of temperature.
