RU1787665C - Method of producing amorphous alloys - Google Patents

Abstract

The invention relates to metallurgy, in particular to the production of amorphous alloys in the form of tapes by the method of rapid quenching. SUMMARY OF THE INVENTION: a method for producing amorphous tapes, includes melting a metal billet in a crucible, releasing and quenching the melt on a rapidly rotating disk, removing the tape from the disk. After removing the tape from the disk, it is additionally subjected to ultrasound treatment with the amplitude of alternating stresses, while the ratio of the amplitude of alternating stresses (a) to the Young's modulus (E) of the material to be processed should be in the range (0.135-0.48). This method provides an increase in the temperature range of plasticity. 1 tab. ate with

Description

The invention relates to metallurgy, and in particular to the production of amorphous alloys in the form of a tape by the method of rapid quenching of melts.

A known method for increasing the magnetic properties of amorphous alloys, including heat treatment in the temperature range of a viscous flow and lower than the solidus temperature with the simultaneous action of tensile stresses of 0.01 tons. The method provides amorphous alloys with high saturation induction and low magnetization reversal losses.

The disadvantage of this method is a sharp drop in ductility (up to 0.01 from the initial level) of the resulting alloys.

There is also known a method of thermomechanical treatment, including two-stage annealing, while the first stage of annealing is carried out under a voltage in the range of 0.10-0.015 of yield strength and at room temperature in a temperature range of 0.1-0.2 of crystallization temperature 0, 5-1.5 hours

The disadvantage of this method is that with such processing, there is a spread in the readings of ductility along the length and width of the resulting tape.

Closest to the present invention is a method for producing an amorphous strip, which involves heating a metal billet in a crucible, releasing the melt onto a rapidly rotating disk, quenching the melt on this disk and removing the finished tape.

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The disadvantage of this method is that the resulting tape has insufficient ductility,

The aim of the invention is to increase the temperature range of ductility,

This goal is achieved by the fact that after removing the tape from the disk, it is additionally subjected to ultrasound treatment with the amplitude of alternating voltages at this ratio, the amplitudes of the signatures are the same as for the module You must be in the range of (0.135-0.48).

Amorphous alloys have high physical and mechanical properties. However, the disadvantage of all alloys without exception is that upon annealing the embrittlement temperature (Tx) they almost completely lose their ductility. Therefore, all thermal treatments of magnetically soft alloys aimed at improving magnetic properties (saturation induction, magnetic permeability, coercive force, magnetization reversal losses), which are usually carried out at temperatures above Tx, necessarily lead to embrittlement, drastically reducing technological effectiveness amorphous alloys.

. The yield suitable for the manufacture of products from such material (magnetic heads, transformer cores, screens, etc.) does not exceed 55-60%,

A significant difference of the proposed method for producing an amorphous tape is that the ultrasonic treatment carried out according to the aforementioned regime leads to an increase in Tx (to an expansion of the temperature range where the heat treatment does not lead to embrittlement). Thereby, the range of embrittlement-safe subsequent annealing, increasing the magnetic properties of amorphous alloys, is extended.

Example An amorphous 2НСР layer was obtained in the form of a tape 15 mm wide, 0.25 mm thick by high-speed quenching on a copper water-cooled disk, at a rotation speed of 23-26 m / s.

Then, a sample 11 11 mm in size and 0.25 µm thick was firmly pressed against the working end of the magnetostrictive transformation. The ultrasonic emitter was powered by a UZDN-2T generator. The frequency of the introduced ultrasonic vibrations (f) is 22 ± 1 kHz; the voltage amplitude set during processing varied between 24.7-164.7

MPa Ultrasonic treatment was carried out for 30 minutes

Curve of variation D Тх (where Тх - embrittlement temperature) depending on

. ultrasonic processing parameters (B 7a / E, where E is Young's modulus, (Ta is the amplitude of alternating stresses) is shown in the graph (curve 1).

PRI me R 2. Amorphous alloy 15XR,

obtained in the form of a tape with a width of 15 mm, a thickness of 0.25 mm was in the form of samples with a size of 11 11 mm, a thickness of 0.25 μm was subjected to ultrasonic treatment according to the mode described in example 1.

The curve of the change in D Tx depending on the parameters of the ultrasonic treatment is shown in the graph (curve 2).

During ultrasonic treatment of amorphous alloys with parameter B less

0.135 x there are no structural changes in the material and therefore the effect of expanding the temperature embrittlement interval is not observed.

Ultrasonic treatment with a parameter B of more than 0.48 in 10 leads to the development of

foci of fatigue failure of the material

and is accompanied by embrittlement of alloys and

accordingly, a decrease in the value of Tx.

The ability to increase the temperature

the embrittlement limit of soft alloys amorphous with magnet is of great practical importance, since in this case, the temperature range of heat treatment is expanded, after which amorphous alloys exhibit

higher manufacturability. Product yield increases in this case to 70-75%. Temporary plasticity resource of amorphous alloys subjected to ultrasonic treatment according to

the proposed regime with optimal parameters increased by 1.5 years. Thus, the shelf life of finished products increases.

Embrittlement Temperature Change

amorphous alloys during ultrasonic treatment are given in the table.

Claims (1)

Formula and b. A method for producing amorphous alloys, including the melting of a metal billet in a crucible, spinning and quenching of the melt on a rapidly rotating cooled disk, removing the finished tape, which requires that, in order to increase the temperature range of plasticity, it is additionally subjected to ultrasound after removing the tape processing with an amplitude of alternating stresses, when In this case, the ratio of the amplitude of alternating stresses to the Young's modulus of the processed material (0.135-0.48). is within Note: In oa, where (7a is the amplitude of alternating stresses; E is the Young's modulus of the processed material.