An investigation has been carried out into the properties of high-permeability nickel-iron-base alloys made by powder-metallurgical methods. It is shown that at the upper limits of composition considered the initial permeability of Mumetal is still increasing. With the straight nickel-iron alloys maximum permeability decreases over the range 45–55% nickel, but the initial permeability tends to increase gradually over the upper end of this range. It is shown that the results are reproducible. Mention is also made of sintered silicon-irons and cobalt-irons.
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