Abstract
The effect of preparation route on the microstructural and magnetostrictive properties of Terfenol-D (Tb 0.27Dy 0.73Fe 1.9) has been studied by means of SEM and TEM observations and by measurement of the magneto-mechanical coupling coefficient. Vertical float zoning produces well aligned dendritic sheets while the planar growth front associated with the alternative Czochralski method results in pseudo-single-crystal formation. The microstructure of the zoned material contains many twins while that of the planar growth method exhibits crystallographic Widmanstatten-type precipitates which are defined by complex interfacial dislocation networks. The significance of these observations for the corresponding magnetostrictive behaviour is discussed.
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