. La rivista tecnica Bell System . RAM per le massime permeabilità della lega con raffreddamento ad aria. Tuttavia, posso dire che la superficie è simile a quella mostrata per le permeabilità iniziali per le leghe raffreddate in modo rapido, anche se, naturalmente, le permeabilità massime sono di grandezze diverse. Fino a 120,000 è stato ottenuto per la lega contenente il 78.5% di nichel. LEGHE MAGNETICHE DI FERRO, NICHEL E COBALTO 445 il gruppo di leghe ad alta permeabilità per forze di magnetizzazione basse nella serie ferro-nichel che abbiamo chiamato permalloy.^ i permalloys, quindi, includono nichel-ferro
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. The Bell System technical journal . ram for the maximum permeabilities forthe air-quenched alloy. However, I can say that the surface obtainedresembles the one shown for the initial permeabilities for the rapidlycooled alloys, although, of course, the maximum permeabilities are ofdifferent magnitudes. As high as 120, 000 has been obtained for thealloy containing 78.5 per cent nickel. MAGNETIC ALLOYS OF IRON, NICKEL, AND COBALT 445 The group of alloys of high permeability for low magnetizing forcesin the iron-nickel series we have named permalloy.^ The permalloys, therefore, include nickel-iron alloys containing more than approxi-mately 30 per cent nickel. In referring to specific compositions inthis group we have found it convenient to use as a distinguishing prefixfor each composition its nickel content. For example, 78.5 permalloyis the alloy containing 78.5 per cent nickel and 21.5 per cent iron.When other elements are added to the permalloys, the chemicalsymbol and the percentage of the added element are also added to. Fig. 6—Hysteresis losses, ergs per cm.^ per cycle, for maximum flux densityof 5, 000 gauss for annealed alloys. the prefix. For example, 3.5-78.5 Mo-permalloy is an alloy containing 3.5 per cent molybdenum, 78.5 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 perminvarcharacteristi
