Abstract
A 50 wt.-% nickel-iron strip 0·004 in. thick has been produced from commercially pure material by powder-metallurgy techniques. The degree of cold rolling and the annealing temperature were varied over a limited range. The suitability of the material for magnetic-amplifier application has been tested by a method described.
Annealing twins, formed during the annealing process, have a deleterious effect on the D.C. coercive force, the A.C. loss, and the magnetic-amplifier characteristics. The density of these twins can be made zero by suitable heat-treatment; for a given degree of cold rolling there is an appropriate annealing temperature to give this result. Experimental results are quoted to show that optimum magnetic properties are achieved in twin-free strip.
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