Method of making amorphous metallic alloys having enhanced magnetic properties by using tensile stress
AssigneeUniversity of Pennsylvania
InventorsCharles D. Graham, Jr., Philip J. Flanders, Takeshi Egami
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Abstract
The magnetic properties of amorphous metallic alloys are improved significantly by application of stress to the alloy material. Selected alloys in ribbon form are subjected to controlled tensile stress, whereupon resulting magnetic properties are superior to corresponding conventional crystalline materials. So stressed, the amorphous alloy material may be applied to advantage as transformer cores, magnetic delay lines, magnetic computer cores, and the like.
Claims8
A method of providing a metal having superior magnetic properties, including low coercivity and high permeability, comprising the steps of:
- a. selecting a metal from the group consisting of the substantially amorphous, noncrystalline metallic magnetic alloys having positive magnetostriction;
- b. subjecting said alloy to a tensile stress less than the elastic limit of the alloy;
- and
- c. sustaining said tensile stress, thereby producing, during said sustaining step, an amorphous alloy having superior soft magnetic properties including low coercivity and high permeability.
Dependencies are inferred from the claim text.