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

Microstructure and magnetostriction of Tb0.3Dy0.7Fe1.95 prepared under different solidification conditions by zoning and modified Bridgman techniques

“…The improvement brought about in magnetostriction by directional solidification is remarkably high compared to that obtained in the conventionally cast condition. This is attributed to ͑i͒ the preferred grain orientation as a result of directional solidification and in accordance with the earlier reported values by several investigators [9][10][11][18][19][20] and ͑ii͒ suppression of ͑Tb, Dy͒Fe 3 phase.…”

Magnetostriction and hysteresis of (Tb 0.36 Dy 0.64 ) 1-x Ho x Fe 1.95 alloys

“…Giant magnetostrictive materials can be used only in the operating temperature range from the spin orientation temperature to the Curie temperature. In the recent years, considerable work has been done to enlarge the operating temperature range of the (Tb, Dy)Fe 2 alloys by partly substituting other rare earth elements for Tb or Dy, or other transition metal for Fe, or shift the ratio of Tb/Dy 3,4 . In this laboratory, Tb/Dy ratio has been changed from 0.3/0.7 to 0.36/0.64 to enlarge the operating temperature range of giant magnetostriction material while the anisotropy constant K1 was increased with the shifting of Tb/Dy ratio 4 .…”

A kind of wide operating temperature range giant magnetostrictive alloys

“…Zone-melting unidirectional solidification was regarded as an effective method to prepare grain-aligned rods with axial preferred orientation [12,13]. Fig.…”

“…The second rare-earth rich phase was distributed at the boundaries of the matrix phase to form dendritic morphologies, similar to Tb 0.36 Dy 0.64 (Fe 1−x Co x ) 2 grain-aligned rods with 1 1 0 and 1 1 2 preferred orientations prepared with growth velocities of 240 and 600 mm/h [12,13]. Previously, we have prepared 1 1 0 oriented crystals Tb 0.36 Dy 0.64 (Fe 0.70 Co 0.30 ) 2 with high growth velocities of 240 mm/h, which exhibit giant magnetostriction over the temperature range from −80 to 100 • C [12]. In the present paper, Tb 0.36 Dy 0.64 (Fe 0.70 Co 0.30 ) 2 grain-aligned rods with effective length of 80 mm were fabricated by the same method with growth velocities of 480 and 720 mm/h.…”