Enhancing magnetic properties of amorphous alloys by rolling
AssigneeUniversity of Pennsylvania
InventorsTakeshi Egami, Philip J. Flanders
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Abstract
A nickel based amorphous alloy in elongated ribbon form is passed between two rollers to obtain approximately a one third reduction in thickness. The rolled alloy samples may then be subjected to elastic tensile loading, which tends to increase remanence and decrease coercivity. The rolling process tends to reduce the unloaded remanence and thereby to improve the load versus remanence range sensitivity by a considerable amount.
Claims8
A method of providing a metal having enhanced magnetic properties comprising the steps of:
- selecting a sample from the class of amorphous metallic alloys;
- passing said sample through roller means to dimensionally alter said sample;
- and
- subjecting said dimensionally reduced sample to an elastic stress of predetermined magnitude.
A method of providing a metal having controlled stress sensitivity of soft magnetic properties including coercivity and remanence, comprising the steps of:
- a. selecting a metal from the group consisting of substantially amorphous, noncrystalline magnetic metallic alloys having positive magnetostriction;
- b. subjecting said sample to a thickness reduction by rolling at a temperature less than its crystallization temperature and maintaining its amorphous character, increasing its coercivity, and reducing its remanence;
- c. subjecting said sample to a tensile stress less than the elastic limit of the alloy;
- and
- d. sustaining said tensile stress, thereby producing, during said sustaining step, an amorphous alloy having further altered superior soft magnetic properties including increased remanence and reduced coercivity.
Dependencies are inferred from the claim text.