Patent ID: 6254695
Filing Date: 2001-07-03
Classification: C21D,G08B,H01F

Abstract:
A method for annealing an amorphous alloy article comprising the steps of:(a) providing an unannealed amorphous alloy article having an alloy composition and a longitudinal axis;(b) disposing said amorphous alloy article in a zone of elevated temperature while subjecting said amorphous alloy article to tensile stress along said longitudinal axis and while subjecting said amorphous alloy article to a magnetic field oriented substantially perpendicularly to said longitudinal axis, to produce an annealed amorphous alloy article having a plurality of characteristics;(c) selecting said alloy composition to comprise iron, cobalt and nickel having an iron content of more than about 15 at % and less than about 30 at % so that the annealed amorphous alloy article has, among said characteristics, an induced magnetic easy plane perpendicular to said longitudinal axis due to said tensile stress which is superimposed to the magnetic easy axis direction induced by said magnetic fields;(d) monitoring at least one of said characteristics of said annealed amorphous alloy article upon exiting said zone of elevated temperature; and(e) adjusting said tensile stress to which said amorphous alloy article is subjected in said zone of elevated temperature dependent on the final characteristic which is monitored.