Directionally solidified TbxDy1−x(MyFe1−y) giant magnetostrictive materials and their applications in transducer

Progress in bulk MgCu2-type rare-earth iron magnetostrictive compounds

“…[16] Much research work has been done on the substitution of Mg, Al, Ga, Si and almost all the 3d transition metals for Fe in Terfenol-D, in an effort to further improve its magnetic and magnetostrictive properties. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] However, few of the substitutions essentially improve the desired properties; conversely, most of them decrease the magnetostriction of Terfenol-D at RT. Indeed, the superexcellent magnetostriction properties of the Terfenol-D are difficult to surpass, but a further reason might be that, in Terfenol-D, the anisotropy is minimized by modulating the Tb/Dy ratio, and a substitution for Fe induces an increase of anisotropy.…”

Magnetostriction of 〈110〉 oriented crystals in Tb0.36Dy0.64(Fe1−xCox)2 (x = 0–0.30) alloys

“…Our group has prepared 1 1 0 oriented (Tb,Dy)Fe 2 crystals by zone melting unidirectional solidification with a large velocity range [11]. Shi et al reported that 1 1 0 oriented crystals of the quaternary alloy Tb 0.5 Dy 0.5 (Fe 0.95 Mn 0.05 ) 2 can be grown by directional solidification [12]. In the present paper, we have prepared grain-aligned Tb 0.36 Dy 0.64 (Fe 1−x Co x ) 2 materials with high growth velocity of 240 mm/h and 900 mm/h and measured their magnetostrictive properties in the temperature range from −80 to 100 • C. Distinct dendritic morphologies were observed and the grains were regularly aligned along the solidification direction (the axial direction of the rod).…”

Magnetostriction Increase of Tb0.3Dy0.7Fe1.95Alloy Prepared by Solidification in High Magnetic Fields

“…Generally, the directional solidification method can only obtain ⟨110⟩ or ⟨112⟩ orientation. [12,13] By using seed crystal technology, the ⟨111⟩ preferred growth orientation can be obtained. However, this orientation is strongly sensitive to directional solidification conditions.…”