Abstract
For hardenable permalloys with 76 wt% nickel the influence of hardening additions (Nb and Ti up to 3%) on the magnetic properties, the annealing behaviour and the Vickers hardness was investigated. An alloy with zero magnetostriction was chosen as the base, additions of Nb and Ti change λ slightly. Customary permalloys achieve zero crystal anisotropy K 1 and therefore high initial permeability by an annealing treatment at temperatures below 550°C which leads to a critical degree of Ni 3Fe order. On the contrary, for alloys with additions of Ti and Nb, K 1 ≈ 0 and high permeability will be established only by a Ni 3(Ti, Nb, Fe) superlattice order at annealing temperatures above 550°C which, simultaneously, causes the high values of the mechanical hardness (HV ca. 220).
Published Version
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