. The Bell System technical journal . annealed alloys. the prefix. For example, Mo-permalloy is an alloy containing per cent molybdenum, per cent nickel, and 18 per cent iron. The ternary alloys of constant permeability and extremely low hysteresis loss at low flux densities we have also grouped together under a common name, perminvar.^ The limits of composition for the perminvars are less easily defined than for the permalloys, because the transition in magnetic properties is not as marked with small ^ H. D. Arnold and G. W. Elmen, Journal of Franklin Inst., May, 1923, p. 62
. The Bell System technical journal . annealed alloys. the prefix. For example, Mo-permalloy is an alloy containing per cent molybdenum, per cent nickel, and 18 per cent iron. The ternary alloys of constant permeability and extremely low hysteresis loss at low flux densities we have also grouped together under a common name, perminvar.^ The limits of composition for the perminvars are less easily defined than for the permalloys, because the transition in magnetic properties is not as marked with small ^ H. D. Arnold and G. W. Elmen, Journal of Franklin Inst., May, 1923, p. 621. G. W. Elmen, Journal of Franklin Inst., Sept., 1928, p. 317. 446 BELL SYSTEM TECHNICAL JOURNAL changes in composition. We have found that compositions between10 per cent and 40 per cent iron, 10 per cent and 80 per cent nickel,and 10 per cent and 80 per cent cobalt have marked perminvarcharacteristics. The hysteresis losses of the alloys in the annealed condition areplotted in Fig. 6 for a maximum flux density of 5,000 gauss. This. Fig. 7—Intrinsic inductions for annealed alloys at H = 50. diagram illustrates again the abrupt change in the magnetic propertiesas we pass from alloys with large iron content to those in which nickelpredominates. In this figure the lowest energy losses are those foralloys in the neighborhood of the permalloy composition. In theiron-cobalt series the 50 per cent cobalt alloy has the lowest hysteresisloss. MAGNETIC ALLOYS OF IRON, NICKEL, AND COBALT 447 The intrinsic inductions, which are those parts of the inductionscontributed by the magnetic material, are shown in Fig. 7 for amagnetizing force of 50 gauss. In the figure the triangle has beenturned through 120° clockwise from its position in the previous figures,placing the iron-cobalt alloys in the back of the diagram. For this
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