Abstract
The effect of niobium on the extent of columnar growth of grains and on the magnetic properties in Alnico alloys has been studied. Alloys containing 1 % Nb show maximum growth of columnar crystals. In columnar alloys, coercivity increases slowly with increasing niobium content up to ∼ 1 %. With further increase in niobium, coercivity and remanence decrease. The maximum energy product (55 kJ m−3) has been obtained at 1 % Nb. Niobium addition has also been found to suppress the precipitation of the undesirable γ phase.
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Pramanik, S., Rao, V. & Mohanty, O.N. Effect of niobium on the directional solidification and properties of Alnico alloys. J Mater Sci 28, 1237–1244 (1993). https://doi.org/10.1007/BF01191958
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DOI: https://doi.org/10.1007/BF01191958