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

Abstract

Articles you may be interested inDual-resonance converse magnetoelectric and voltage step-up effects in laminated composite of long-type 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 piezoelectric single-crystal transformer and Tb0.3Dy0.7Fe1.92 magnetostrictive alloy bars Effect of B on the microstructure and magnetostriction of zoned Dy 0.7 Tb 0.3 Fe 1.95

Control of solid–liquid interface morphology and radial composition distribution: TbDyFe single crystal growth

“…In order to obtain excellent magnetostrictive properties of Terfenol-D, it is of crucial importance to fabricate oriented polycrystalline or single crystal by directional solidification [9]. Seen from equilibrium phase diagram of Tb-Dy-Fe, the pro-peritectic RFe 3 phase appears firstly in the system during directional solidification [10,11]. This is a harmful phase which could reduce the mechanical and magnetostrictive properties of the materials [12,13].…”

Orientation Selection and Microstructural Evolution in Directionally Solidified Tb0.3Dy0.7Fe1.95

“…Therefore, an in-depth understanding of directional solidification of the (Tb,Dy)Fe 2 intermetallic is the topic of interest with a special emphasis on orientation selection and microstructural evolution. Several researchers, including the authors, [4][5][6][7][8][9][10][11][12][13][14][15] are pursuing investigations in this area, and the efforts have led to an improved know-how of the physical metallurgical aspects of this material. However, the key issue that remains unresolved is to grow the material successfully with h111i texture.…”

“…On the other hand, zone melting or modified Bridgman techniques offer scope for obtaining specimens of larger dimensions. Although reports on formation of different texture components through these methods are available, [4][5][6][7][8][9][10][11][12][13][14][15] an integrated theory on the underlying mechanism is yet to evolve that can explain the orientation selection as a function of solidification parameters.…”

“…To develop grain orientation in the cylindrical rods of this material, methods such as zone melting (for diameter £ 8 mm) and modified Bridgman (for diameter ‡10 mm) are generally adopted. [4][5][6][7][8] The processing parameters of directional solidification techniques such as temperature gradient (G) and solidification rate (v) have a profound influence on the postsolidification microstructure and evolution of the texture. Therefore, an in-depth understanding of directional solidification of the (Tb,Dy)Fe 2 intermetallic is the topic of interest with a special emphasis on orientation selection and microstructural evolution.…”

Microstructure and Mössbauer studies on magnetostrictive Tb0.3Dy0.7Fe1.95 − x Nb x (x = 0, 0.025, 0.05 and 0.075)

“…It is seen from the phase diagram of Tb-Fe and Dy-Fe that the RFe 2 phase is formed by the peritectic reaction of RFe 3 +L →RFe 2 . During solidification of stoichiometric RFe 2 alloys, the primary phase formed is RFe 3 owing to the presence of a high temperature RFe 3 freezing zone [3]. Since RFe 3 imparts deleterious effects on the magnetostrictive properties of the alloys, its formation is sought to be suppressed.…”