Abstract
Considerable improvements of the magnetic properties of Ni–Fe–Ta alloys having a range of composition from 70.03 to 77.41% Ni, 9.50 to 15.96% Fe, and 9.57 to 17.80% Ta have been effected by heating in hydrogen atmosphere at high temperatures of 1050 to 1350°C, followed by cooling at rates from 100 to 8100°C/hr. The highest value of 75000 in initial permeability and of 650000 in maximum permeability can be obtained with a composition of 73.00% Ni, 11.60% Fe, and 15.40% Ta by cooling at the rate of 800°C/hr after heating at 1250°C for 30 min and 3 hr, respectively. The alloy subjected to the latter heat treatment exhibits the electrical resistivity of 70.1 μΩ-cm and the Vickers hardness 211. The high permeability of the Ni–Fe–Ta alloys is largely due to the effective contributions of high-temperature heat treatment in hydrogen atmosphere to the homogeneity of the alloys, removal of impurities and grain growth, associated with the low value of magnetostriction caused by the atomic arrangement in the ordered state.
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