Abstract
Measurements of the magnetic and electrical properties and hardness were made on quaternary Ni–Fe–Ta–Cr alloys which were heated in hydrogen atmosphere at 1150°C for 3 hr and then cooled at 0.75–600°C/hr from a temperature above the order-disoder transformation points. The highest values of initial permeability and maximum permeability obtainable with this alloy system were found to be 140000 and 599000 respectively for a composition of 74.08%Ni, 11.26%Fe, 14.11%Ta and 0.55%Cr when the cooling rate of 200°C/hr was applied. The alloy exhibited an electrical resistivity of 75.6 μΩ-cm, its Vickers hardness being 201. It is also shown that the alloys in this system possess very low magnetostriction constants.
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