SU532645A1 - Ligature - Google Patents

Description

The invention relates to metallurgy and can be used as a master alloy in the manufacture of aluminum alloys. Double ligatures used in the manufacture of aluminum alloys are known, for example, aluminum-manganese ligature with a manganese content of 8-10% and magnesium-manganese ligature with a manganese content of 5%, 1. Use of known double ligatures to produce aluminum alloy AMG-6 containing aluminum , magnesium and manganese, requires to increase the temperature of metal preparation, since the melting points of known double ligatures significantly exceed the melting point of aluminum. The crystallization interval of aluminum of the Eu-manganese master alloy is 800–71 ° C, and that of magnesium-manganese — 80 – 65 ° C. An increase in the temperature of preparation of the alloy causes an increase in the solubility of hydrogen in the metal and thereby an increase in the gas content. In addition, the use of several ligatures complicates production. Closest to the invention, ligature 2 contains, in wt.%: Magnesium 15-20 Manganese 8/10 Aluminum, the Remaining Filling temperature of the ligature is 68O -. However, a high melting and casting temperature, leading to an increased gas content of the master alloy and the alloy being prepared, requires effective methods for degassing the melt before ingot casting. The purpose of the invention is to reduce the melting temperature and gas content to improve the quality of the prepared aluminum-magnesium alloys without the use of effective methods for degassing the melt. For this, the proposed ligature contains components in the following ratio, wt%; Magnesium25.0-27.0 Manganese2.1-2.4 AluminumEther The characteristics of the alloy and the alloy prepared from it are given in Table 1

Table 1

The mechanical properties of the AMG-6 alloy treated with the proposed and known ligatures are given in table. 2,

The proposed ligature has a low melting point and low gas content at a temperature of wadding of the ligature.

According to technical conditions (TU)

32.0

16,0

Claims (2)

Invention Formula A ligature containing aluminum, magnesium E & g and manganese, characterized in that, in order to reduce the melting temperature and gas content, its components are taken in the following ratio, by weight,%: Magnesium25.0-27.040 Manganese2,1-2,4 Aluminum Else This makes it possible to prepare an aluminum-magnesium alloy with a reduced hydrogen content (less than 0.4 g), which meets the requirements of standards for the AMG-6 alloy. The required hydrogen content is achieved without the use of effective means of refining the alloy. table 2 15.0 Sources of information taken into account in the examination: 1, Kurdyumov A, B, and others. Foundry production of non-ferrous and rare metals, M, 1972, p., 126, 2.Kurdyumov A, B, etc. The foundry production of non-ferrous and rare metals, M, 1972, p. 131 (prototype).