Isothermal hold method of hot working of amorphous alloys
AssigneeGeneral Electric Company
InventorsAlan I. Taub, Peter G. Frischmann
Life of this patent
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Abstract
The problem of working an amorphous alloy is overcome by heating the alloy at a rate of temperature increase above about 1000.degree. C. per minute. The amorphous alloy is worked by homogeneous deformation after its temperature has been very rapidly increased to above the softening temperature of the alloy. Desirable magnetic properties of the alloy are preserved by working the alloy in this fashion and also tool life is extended.
Claims10
A method of deforming an amorphous alloy without destroying its magnetic properties which comprises
- providing an amorphous alloy specimen,
- ramping the temperature of the specimen at a rate at or above 1000.degree. C./min which preserves its viscosity at a low value of less than 4.times.10.sup.11 Pa-S,
- heating the specimen to above its softening temperature and below its recrystallization temperature,
- stressing the specimen to deform the specimen at or below its yield strength after the temperature has been ramped to above its softening temperature.
A method of forming an amorphous alloy without destroying its magnetic properties which comprises
- providing an amorphous alloy specimen,
- ramping the temperature of the specimen at a rate dT/dt at or above 1000.degree. C. per minute which can bring the temperature ratio T.degree.K/T.sub.x .degree.K., to within the hatched area of the graph of FIG. 2 to the right of the 1000.degree. C./min. value of the abscissa,
- stressing the specimen to deform the specimen at or below its yield strength after the temperature has been ramped at or above 1000.degree. C. per minute to above the softening temperature and below its crystallization temperature.
Dependencies are inferred from the claim text.