Alloys of Fe49Co49V2 (Hiperco Alloy 50) (Hiperco is a registered trademark of CRS Holdings, Inc.), both annealed and thermally aged, were studied using anomalous synchrotron x-ray and neutron powder diffraction. Rietveld and diffraction profile analysis indicated both an increase in the structural order parameter and a small lattice expansion (∼0.0004 Å) after aging at 450 °C for 200 h. In addition, a cubic minority phase (<0.3%) was identified in the ‘‘annealed’’ sample, which increased noticeably (0.3%→0.8%) as a result of aging. The presence of antiphase domain boundaries in the alloys was also revealed. These results directly correlate with the observed changes in the magnetization behavior and challenge the notion that a ‘‘fully’’ ordered Fe–Co alloy demonstrates optimum soft magnetic properties.
The magnetic and mechanical properties of 49%Co-l.9%V-0.3%Nb-Fe high strength (0,=90 ksi) soft magnetic alloy were studied after aging at 450'C for up to 8 0 0 h . The magnetic induction B (H. = 10 and 2 5 Oe respectively) decreases rapidly in the first 100 h and approaches a lower limit at about 3 0 0 h. The coercive field remains constant during aging. Tensile specimens aged for 2 0 0 h a t 4 5 0 ' C did not show any changes in the room temperature yield stress and elongation. Transmission electron microscopy identified two precipitate phases: NbC and a Laves phase (hcp. a=4.7A, c=7.72A) . The Laves phase appears in grain boundaries and triple-points and inhibits the grain growth therefore enhancing the mechanical properties.
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