Abstract
This paper reports the results of a study to assess the feasibility of replacing vanadium by niobium in equiatomic Fe-Co based soft magnetic alloys. The changes in microstructural and microscopic parameters, such as the degree of long range order (5) and the hyperfine field (HF), as functions of the type and proportion of ternary addition have been determined and correlated with the relevant macroscopic properties, namely, coercive force, saturation magnetization, and workability. Mössauer spectroscopy revealed that the high solubility of vanadium in Fe-Co produces a significant reduction in the averageHF at the iron nucleus sites and a lower saturation magnetization compared to binary equiatomic Fe-Co. In contrast, the lower solubility limit of about 0.3at% for niobium restricts the degradation ofHF and the saturation magnetization due to niobium in solution to insignificant levels. However, exceeding the solubility limit results in the precipitation of a niobium-rich paramagnetic phase which is accompanied by a fall in the saturation magnetization and an increase in the coercive force. The rate of ordering has been determined by following the development of the (100) superlattice x-ray lines. The data have shown that the addition of 0.62at% Nb reduces the ordering kinetics by about two orders of magnitude when compared with an alloy containing 2.5at% V. The slower the ordering kinetics the easier it is to produce the alloy in the ductile, disordered state. Thus these results demonstrate that niobium is preferable to vanadium for enhancing the workability and conserving the magnetic qualities of the base equiatomic Fe-Co.
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Persiano, A.I.C., Rawlings, R.D. Effects on some physical properties of soft magnetic Fe-Co alloys due to the replacement of vanadium by niobium. J. Materials Engineering 12, 21–27 (1990). https://doi.org/10.1007/BF02834484
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DOI: https://doi.org/10.1007/BF02834484