SU897881A1 - Method of charge preparation for smelting aluminium alloys - Google Patents

Description

one

The invention of Otosit to non-ferrous metallurgy, in particular to the metallurgy of aluminum and its alloys.

It is known that the state of the charge for the preparation of alloys, such as aluminum, has a significant effect on the mechanical properties of the alloys 1.

A known method of preparation of the charge for melting aluminum alloys, including heating and plastic deformation of the charge. The shncht is heated to 300-500 ° C, and plastic deformation is carried out in solid form by compression and rolling by 5-20% 2.

The alloys obtained on the mixture treated in this way have mechanical properties higher than those prepared on the ordinary one, but the level of these properties can be even higher.

The invention is based on the strength and ductility of aluminum alloys.

The goal is achieved by the fact that according to the method of preparing the charge for melting aluminum alloys, including

heating and plastic deformation of the mixture, the mixture is heated above the solidus temperature. and the deformation is carried out in a liquid-solid state.

Heating above the solidus temperature is necessary for complete melting of charge metals and master alloys.

Processing the part of the mixture by the proposed method provides a structure with smaller and spheroidal precipitates of the second phase, for example, for A1-Cu and Al-Fe alloys. This is due to a change in the content of gases that have a determining effect on the crystallization process.

Example 1. The implementation of the proposed method on an aluminum alloy with 5% copper.

Aluminum A99 is melted, heated to 700-720 ° C and deformed in a liquid-solid state, for which aluminum in small portions (5-10 g) is fed to the press and crystallized under pressure at a rate of about 10 -10 degrees / with. Get i disc-shaped plates with a thickness of 0.1-2 mm.

Then the aluminum treated in this way is used to prepare alloy in an amount of 60% by weight of the heat. Samples for mechanical tests are made from the obtained castings. The effectiveness of the method is evaluated by the structure and mechanical of the Alloy prepared by

Famous (charge aluminum

AOO is subjected to deformation

up to 20%)

The proposed (60% charge a) commemorated A99 is heated to 740-760 ° C, subjected to deformation in a liquid-solid state)

STV on the accepted methods. In parallel, alloys were manufactured using ishkhta, processed by a known method. The mechanical properties of the alloy with 5% copper in the cast state prepared by known and proposed methods are presented in Table. 1. Table 1

Mechanical properties

G, kgf / mm Ib,%

V,%

13.1

6.0

16.8

6,6

PRI me R 2 .. The implementation of the proposed method on an aluminum alloy with 7% of metsi. Copper M 1 is melted, heated to 11201140 ° C and processed analogously Alloy prepared by the method Known (charge copper is deformed by 20% at COO-BOO C) Proposed in Example 2 Example 3, Implementation of the proposed method on an aluminum alloy with 3% iron. The ligature of iron (A1 - 3% Fe) is melted, heated to 920-940 ° C and subjected to the Alloy prepared by the method Known (the LREe ligature is deformed by 15% at 300-)

The proposed example 3

11.4

27.1

Claims (2)

9. Example 1. Then, the treated copper is used to prepare an aluminum alloy with 7% honey. The mechanical properties of the alloy with 7% copper in the cast state prepared by known and proposed methods are presented in Table. 2. Table2 Mechanical properties of BTGS / mm THGGs 7,% 11.63,32.0 18.18,419.4 treated similarly to Example 1. Then the treated ligature is used to prepare aluminum alumina powder with 3% iron. The mechanical properties of the alloy with 3% iron in the cast state prepared by known and proposed methods are given in Table. 3. Table 3 Mechanical properties of IG II, g, kgf / mm S,% I Y,% 9.18,618.9 5 89788 From the data of tables 1, 2 and 3 it can be seen that. The mechanical properties of aluminum alloys melted on the charge treated by the proposed method increase (ultimate strength by 45-55% for Al-Cu alloys; relative elongation by 10-160% for Al-Cu and Al-Fe alloys) . The application of the proposed method for the preparation of charge metals and master alloys in mechanical engineering makes it possible to reduce the consumption of if-10 honest metal for the manufacture of parts while maintaining. their former service properties, which ultimately leads to savings in labor, material and energy resources. 15 Formula of the invention A method for preparing a charge for aluminum alloys, including heating 1 "and plastic deformation of the charge, which is of complete strength and ductility of alloys, shnhtu heated above the solidus temperature, and the deformation is carried out in a liquid-solid state. Sources of information taken into account during the examination 1. V. Afanasyev. V. Nikitin, Structure and properties of aluminum alloys, depending on the conditions of preparation of charge materials (solid materials. Foundry, 1976, No. 4, p. 16- 17 2. USSR author's certificate N 476326, cl. C 22 C 1/02; 1972.