| The magnetic properties of 45% Ni-Fe permalloy sheet was studied by measuring its coercive force(H_c), maximum permeability(μmax.), remanence(B_r), induction at 10 Oe(B_(10)) and texture in order to understand the relationship between magnetic properties and preferred orientation with cold reduction in this alloy. Specimens were prepared by annealing from 900 to 1200℃ for 3 hours under high-pure H₂atmosphere after 60, 70, 80 and 90% single cold rolling. With increasing cold reduction, the {100}$lt;100$gt; texture developed strongly. This texture improved the properties of coercive force and maximum permeability because $lt;100$gt; is easy direction of magnetization in ferrous alloy. The high-temperature annealing in dry H₂improved also coercive force and maximum permeability by reducing impurity and the number of grain boundaries that prevent a movement of magnetic domain wall. B_(10) was not affected by cold reduction and annealing temperature. This means that B_(10) is not affected by texture and grain size in contrast to the coercive force and maximum permeability. B_(10) was 14000 Gauss and B_(50) was 14500 Gauss at room temperature (20℃). Br was not affected by cold reduction but was decreased remarkably by increasing annealing temperature. It is considered that the remanence is affected by impurity and grain size but not by texture. |
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