Aluminium alloy and use of same in methods of die casting

FIELD: metallurgy.

SUBSTANCE: aluminium alloy contains the following components: from 4.5 to 6.5 wt % magnesium, from 1.0 to 3.0% wt % silicon, from 0.3 to 1.0% wt % manganese, from 0.02 to 0.3% wt % chromium, from 0.02 to 0.2% wt % titanium, from 0.02 to 0.2 wt % zirconium, from 0.0050 to 1.6% wt % of one or more rare-earth metals, max. 0.2% iron, and the rest is aluminium.

EFFECT: alloy has high strength properties and is intended for use in die casting and related methods.

8 cl, 1 tbl

 

The invention relates to an aluminum alloy, in particular aluminum alloy, along with contains aluminum as a main component of an alloy of magnesium and silicon, and is intended for use in injection molding and related methods.

Aluminum parts, die-cast, has acquired, in particular, in the automotive industry of particular importance. Increased mechanical requirements for aluminum parts, die-cast, automotive, replaced primarily for reasons of economy, the weight of steel parts such as aluminum alloys, responsible use of special AlSiMg - or AlMgSi-alloys for pressure die casting with subsequent process after casting heat treatment.

From AT 407533 known, for example, aluminum alloy >3.0 to 7.0% by weight of magnesium, from 1.0 to 3.0% by weight of silicon, 0.3 to 0,49% by weight of manganese, from 0.1 to 0.3% by weight of chromium, from 0 to 0.15% by weight of titanium, a maximum of 0.15% by weight of iron and consequently max 0,00005% by weight of calcium and sodium and max is 0.0002% by weight of phosphorus.

In EP-B-0792380 described alloy which contains from 3.0 to 6.0, preferably from 4.6 to 5.8% by weight of magnesium, from 1.4 to 3.5, preferably from 2.0 to 2.8% by weight of silicon, from 0.5 to 2.0, preferably from 0.6 to 1.5% by weight of manganese, a maximum of 0.2, preferably from 0.1 to 0.2% by weight titanium and maximum of 0.15, preferably max 0.1% by weight of iron and it is available in restructured condition.

These known AlMgSi-alloys intended for injection molding and application in related ways. They are already in melted state have the strength and elongation, and AlSiMg alloys, for example, the known alloy type AlSi7Mg 0.3 full curing (which is referred to as "T6"). A significant drawback of these types of AlMgSi-alloys, however, is very low in comparison with AlSiMg-alloys, the 0.2%limit tensile stress.

the 0.2%limit tensile stress characterizes the transition from elastic to plastic deformation of the casting and, in particular, is also important in respect of significant importance when the collision structural details.

In the literature there is evidence of short continuing Max. 2 hours of heat treatment to increase 0.2%ultimate tensile strength.

Heat treatment of parts, injection molded from the above AlMgSi-alloys carries with it, however, numerous disadvantages. First of all is there is no advantage in production costs. Further significant disadvantages of thermal processing are typical defects in parts molded under pressure, such as warping and, above all, the bulges that occur due to thermal destruction of closed materials for forms, which are known under t is rbinom "Blister". Warping negates the advantage of making parts by injection molding, which consists in obtaining parts with finite sizes.

For details, die-cast, which is not subjected to heat treatment to increase, in particular of 0.2%of the ultimate tensile strength is limited, due to the relatively low of 0.2%of the ultimate tensile strength, the field of application described above aluminum alloys, so as to loaded parts, injection molded, high demands for strength properties. The use of other parts, injection molded from such alloys can help in this case, only the increase in wall thickness. However, increasing the wall thickness reduces the advantage gained by reducing the weight with the use of aluminum, or reduces this advantage.

In this regard, the aim of the present invention to provide an aluminum alloy of the AlMgSi type, which are suitable for use in injection molding and have, however, higher rates relative to the 0.2%limit of the tensile strength, in comparison with comparable strength properties known from the prior art alloys. Another aim of the invention is to develop such aluminum alloys, which are desirable prochnost the properties are already at the stage of casting, so there is no need for heat treatment and eliminates the disadvantages associated with it. Another objective of the present invention is the development of aluminum alloys that can be used for aluminum components in the automotive industry, which must meet high mechanical requirements, which would expand the use of aluminum components, for example, in the automotive industry.

These purposes according to the invention are achieved with the help of alloy, which has the following composition: from 4.5 to 6.5% by weight magnesium, from 0.1 to 3.0% by weight of silicon, 0.3 to 1.0% by weight manganese, from 0.02 to 0.3% by weight chromium, from 0.02 to 0.2% by weight titanium, from 0.02 to 0.2% by weight of zirconium, from 0,0050 to 1.6% by weight of one or more rare earth metals, a maximum of 0.2% by weight iron and the rest is aluminum.

In another embodiment proposed according to the invention, the alloy has the following composition: from 5.5 to 6.5% by weight magnesium, from 2.4 to 2.8% by weight silicon, from 0.4 to 0.6% by weight manganese, from 0.05 to 0.15% by weight of chromium.

In another preferred embodiment proposed according to the invention alloy is provided by the zirconium content of from 0.05 to 0.2% by weight.

As rare earth metals are preferred samarium, cerium or lanthanum. They can be added as alloying additives is one or in any combination with each other. A particularly preferred combination of samarium with cerium or samarium with lanthanum. A particularly preferred alloy contains rare earth metal samarium and cerium in an amount of from 0,0050 to 0.8% by weight of samarium and 0,0050 to 0.8% by weight of cerium.

The addition of samarium and cerium leads to solidification of the alloy to the formation of a discharge type AlCe and AlSm in a variety of compositions that contribute to the hardening effect.

Due to the cerium additives, in addition, prevents the tendency to adhesion of the alloy in the mold during injection molding, which is an additional beneficial effect on the quality of the moulded parts under pressure.

The present invention more clearly shown with mechanical properties that are defined for the following alloys. Mechanical properties were determined for the sectional plates are manufactured using injection molding, tensile tests according to DIN EN 10002, and when the tensile tests were stretched 2.7 mm section. This area of the wall thickness is preferably used for the manufacture of welded and significant in the circumstances of the collision structural parts. Mechanical parameters represent average values of 25 measurements. The results of the tensile tests are shown in table 1. In these alloys in experiments 1-4 alloys proposed in accordance with Britanie, in the reference alloy talking about the alloy, the composition of which corresponds to the alloy proposed according to the invention, which, however, does not contain as alloying additives of rare earth metals.

Table 1
ExperienceOptionTensile strength, Rm, MPathe 0.2%limit tensile strength, Rp0,2, MPaThe elongation at break And%
1AlMg5Si2MnCr + 0,02% Sm33020010,4
2AlMg5Si2MnCr + 0,04%Sm + 0,02% Ce3602209,8
3AlMg5Si2MnCr + 0,05% Sm + 0,03% Ce33020011,5
4AlMg5Si2MnCr + 0,11% Sm + 0,06% Ce3402009,5
The background is
tion alloy
AlMg5Si2MnCr29717912,8

As can be seen from the table, the addition of cerium and samarium leads compared to the unmodified base alloy AlMg5Si2MnCr to a significant increase of 0.2%ultimate tensile strength.

The strength that can be achieved in aluminum alloys proposed in accordance with the invention, are to the same level, which is achieved in forged products from AlSiMgMn in the T6 condition, i.e. after the heat treatment. In this regard, and based on the 0.2%limit tensile strength, improved compared with the known aluminum alloys type AlMgSi alloys are proposed in accordance with the invention, suitable for new applications, in particular for the manufacture of parts made of aluminium, die-cast experiencing high load, to which there is increasing interest in the automotive industry.

Similar results concerning the mechanical strength could be proposed in accordance with the invention alloys, if the cerium partially or completely replaced by lanthanum.

1. Aluminum alloy, characterized in that it contains from 4.5 to 6.5% by weight magnesium, from 1.0 to 3.0% by weight of silicon, 0.3 to 1.0% by weight manganese, from 0.02 to 0.3% by weight of the HRO is, from 0.02 to 0.2% by weight titanium, from 0.02 to 0.2% by weight of zirconium, from 0,0050 to 1.6% by weight of one or more rare earth metals, maximum 0.2% iron and the remainder aluminum.

2. Aluminum alloy according to claim 1, characterized in that it contains from 5.5 to 6.5% by weight magnesium, from 2.4 to 2.8% by weight silicon, from 0.4 to 0.6% by weight manganese, from 0.05 to 0.15% by weight of chromium.

3. Aluminum alloy according to claim 1 or 2, characterized in that it contains zirconium in an amount of from 0.05 to 0.2% by weight.

4. Aluminum alloy according to claim 1 or 2, characterized in that the rare earth metal represented by samarium, cerium or lanthanum.

5. Aluminum alloy according to claim 1 or 2, characterized in that the rare earth metal contains cerium and samarium.

6. Aluminum alloy according to claim 1 or 2, characterized in that as the rare earth metal contains lanthanum and samarium.

7. Aluminum alloy according to claim 1 or 2, characterized in that it contains: 0,0050 to 0.8% by weight of samarium and 0,0050 to 0.8% by weight of cerium.

8. The use of aluminum alloy according to one of claims 1 to 7 in detail, cast by way of injection molding, which is based on forming a partially liquid state.



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: aluminium-based alloy contains the following, wt %: zinc - 6.35 - 8.0, magnesium - 0.5 - 2.5, copper - 0.8 -1.3, iron - 0.02 - 0.25, silicon - 0.01 - 0.20, zirconium - 0.07 - 0.20, manganese - 0.001 - 0.1, chrome - 0.001 - 0.05, titanium - 0.01 - 0.10, boron - 0.0002 -0.008, beryllium - 0.0001 - 0.05, at least one element from potassium, sodium, calcium group in quantity of 0.0001 - 0.01 each, aluminium is the rest; at total content of zinc, magnesium, copper within 8.5-11.0, and that of zirconium, manganese and chrome - within 0.1-0.35. Method involves loading and melting of charge components, flux treatment of molten metal, molten metal purification, further vacuum treatment of molten metal in mixer and casting of ingots; boron is added to molten metal in the form of Al-Ti-Be alloy which is distributed at least one hour before molten metal pouring to mixer along the whole surface area of mixer bottom; at that, mixer is pre-heated to temperature which is by 15-30C more than molten metal temperature, and vacuum treatment of molten metal in mixer is performed at temperature of 695-720C, during 45-90 minutes.

EFFECT: invention allows obtaining high-strength aluminium alloys with absence of primary intermetallic compounds, decreased content in them of non-metallic inclusions and dissolved gases, with stable properties and optimum size of grain on basis of standard furnace and process equipment.

2 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: Invention relates to metallurgy and may be sued in producing strained semi-finished products from thermally non-hardenable welded aluminium-based alloys used as structural and semiconductor material, primarily, in aerospace and nuclear engineering. Aluminium-base alloy comprises the following components in wt %: magnesium - 1.8-2.4, scandium - 0.2-0.4, zirconium - 0,1-0.2, cerium - 0.0001-0.005, iron - 0.01-0.15, silicon - 0.01-0.1, aluminium making the rest. Note here that iron-to-silicon content ratio may not be less than unity.

EFFECT: higher strength and conductivity, hence, reduced weight.

2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to deformed thermally hardened high-tensile aluminium alloys Al-Zn-Mg-Cu designed for fabrication of all kinds of deformed semi-finished products, including thin sheets used in aircraft and machine engineering and other branches of industry. Deformed alloy on base of aluminium and an item out of it contain the following components, wt %: zinc 2.5-4.0, magnesium 4.1-6.5, copper 0.2-1.0, iron to 0.25, silicon to 0.15, scandium 0.005-0.3, zirconium 0.005-0.25, nickel and/or cobalt to 0.1, titanium to 0.15, boron and/or carbon to 0.05, at least one element out of group: hafnium to 0.15, molybdenum to 0.15, cerium to 0.15, manganese to 0.5, chromium to 0.28, yttrium to 0.15, vanadium to 0.15, niobium to 0.15, aluminium and unavoidable impurities - the rest, also ratio of Mg contents to Zn contents is more or equal to 1.1.

EFFECT: production of alloy and items out of it possessing raised strength properties at simultaneous increased wear-resistance, reduced rate of crack growth, increased durability of welded connections and reduced density, which results in increased resource and reliability of items operation and in reduced weight of structures.

3 cl, 2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: alloy contains following components, wt %: magnesium 4.1-4.9, titanium 0.01-0.04, beryllium 0.0001-0.005, zirconium 0.05-0.12, scandium 0.17-0.30, cerium 0.0001-0.0009, manganese 0.19-0.35, chromium 0.01-0.05, group of elements, containing iron and silicon 0.06-0.25, aluminium is the rest, at that value of iron content relation to silicon content has to be not less than unity.

EFFECT: increased strength property, strength of welded connection at cryogenic temperatures, weight saving of welded fabrication, manufactured from suggested alloy.

2 tbl, 1 ex

FIELD: metallurgy; alloys.

SUBSTANCE: alloy and products out of this alloy contain the following elements, mas.% magnesium 0.6-1.2; silicon 0.6-1.2; manganese 0.3-1.0; iron 0.1-0.5; copper 0.05-1.0; titanium 0.005-0.05; at least one element out of the group: tin 0.6-1.0; bismuth 0.2-0.8; at least one element of the group: gallium 0.001-0.05; calcium 0.001-0.05; at least one element from the group: boron 0.0005-0.005; carbon 0.0001-0.005; aluminium - the rest.

EFFECT: there obtained an alloy and products out of it not containing lead and possessing upgraded machinability, high corrosion resistance and strength.

2 cl, 4 dwg, 2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: said utility invention relates to the manufacture of products of a rolled aluminium alloy highly resistant to damage. The method involves casting an ingot with a chemical composition selected from the group consisting of AA2000, AA5000, AA6000, and AA7000 alloys, homogenisation and/or heating of the ingot after casting, hot rolling of the ingot into a hot-rolled product and, optionally, cold rolling of the hot-rolled product into a cold-rolled product. After the hot rolling, the hot-rolled product is cooled from the hot-rolling mill output temperature (Tout) to 150°C or lower, at a controlled cooling rate decreasing within the set range according to a continuous cooling curve determined using the following expression: T(t)=50-(50-Tout)eα-t, where T(t) is the cooling temperature (°C) as a function of the cooling time (hours), t is the cooling time (hours), and α is a parameter determining the cooling rate, within a range of -0.09±0.05 (hr-1).

EFFECT: enhanced impact strength; resistance to growth of fatigue cracks, and corrosion resistance without strength deterioration.

19 cl, 7 tbl, 1 dwg, 2 ex

FIELD: nonferrous metallurgy.

SUBSTANCE: invention is intended for use in metallurgy, mechanical engineering, and aircraft industry, in particular for manufacturing honeycomb structures. Alloy is composed of, wt %: magnesium 8-10, manganese 0.1-0.15, zirconium 0.15-0.2, cobalt 0.05-0.2, boron 0.005-0.007, beryllium 0.001-0.02, iron 0.15-0.2, silicon 0.15-0.2, titanium 0.1-0.2, aluminum - the balance. Ingot for manufacturing structural foil is obtained by semicontinuous casting in rotary crystallizer at volumetric cooling 4-20°C/sec. Structural foil manufacturing process comprises homogenization, hot rolling, annealing, cold rolling followed by annealing in air atmosphere, second cold rolling followed by annealing, and final cold rolling.

EFFECT: increased strength of alloy at ambient and elevated temperatures and improved processability un rolling stage.

3 cl, 3 tbl

FIELD: metallurgy of aluminum-based alloys on base of Al-Mg-Mn system for manufacture of armored semi-finished products and articles for aviation and shipbuilding and other civil equipment.

SUBSTANCE: proposed alloy contains the following components, mass-%: magnesium, 4.2-6.5; manganese, 0.5-1.2; zinc, up to 0.2; chromium, up to 0.2; titanium, up to 0.15; silicon, up to 0.25; iron, up to 0.3; copper, up to 0.1; zirconium, 0.05-0.3 and at least one element selected from group containing: scandium, 0.05-0.3; beryllium, 0.0001-0.01; yttrium, 0.001-0.1; neodymium, 0.001-0.1; cerium, 0.001-0.1, the remainder being aluminum. Proposed alloy and articles made from it possesses high resistance to ballistic action of various projectiles due to optimal strength characteristics, optimal structure and plasticity characteristics.

EFFECT: high resistance to ballistic action of projectiles; enhanced corrosion resistance and weldability; reduced mass.

3 cl, 1 dwg, 3 tbl, 3 ex

FIELD: alloy metallurgy.

SUBSTANCE: invention relates to deformable, thermally strengthened, highly technologically effective, corrosion-resistant welding alloys based on the system Al-Mg-Si and articles made of thereof. The proposed alloy and article made of thereof comprise the following components, wt.-%: magnesium, 0.3-1.2; silicon, 0.3-1.7; manganese, 0.15-1.1; calcium, 0.05-0.; sodium, 0.0002-0.01, and at least one metal taken among the group comprising copper, iron, zirconium and chrome, 0.02-1.0, and aluminum, the balance. Invention provides the development of deformable alloy based on the system Al-Mg-Si and article made of this alloy that show enhanced technological effectiveness at cold stampings by extrusion and improved workability by cutting.

EFFECT: improved and valuable properties of alloy and article.

3 cl, 3 tbl, 1 ex

The invention relates to metallurgy, in particular to the production of composite materials with a matrix of aluminum alloy, reinforced with steel fibres, for the manufacture of airframe components, stringimage set, plating, etc

FIELD: alloy metallurgy.

SUBSTANCE: invention relates to deformable, thermally strengthened, highly technologically effective, corrosion-resistant welding alloys based on the system Al-Mg-Si and articles made of thereof. The proposed alloy and article made of thereof comprise the following components, wt.-%: magnesium, 0.3-1.2; silicon, 0.3-1.7; manganese, 0.15-1.1; calcium, 0.05-0.; sodium, 0.0002-0.01, and at least one metal taken among the group comprising copper, iron, zirconium and chrome, 0.02-1.0, and aluminum, the balance. Invention provides the development of deformable alloy based on the system Al-Mg-Si and article made of this alloy that show enhanced technological effectiveness at cold stampings by extrusion and improved workability by cutting.

EFFECT: improved and valuable properties of alloy and article.

3 cl, 3 tbl, 1 ex

FIELD: metallurgy of aluminum-based alloys on base of Al-Mg-Mn system for manufacture of armored semi-finished products and articles for aviation and shipbuilding and other civil equipment.

SUBSTANCE: proposed alloy contains the following components, mass-%: magnesium, 4.2-6.5; manganese, 0.5-1.2; zinc, up to 0.2; chromium, up to 0.2; titanium, up to 0.15; silicon, up to 0.25; iron, up to 0.3; copper, up to 0.1; zirconium, 0.05-0.3 and at least one element selected from group containing: scandium, 0.05-0.3; beryllium, 0.0001-0.01; yttrium, 0.001-0.1; neodymium, 0.001-0.1; cerium, 0.001-0.1, the remainder being aluminum. Proposed alloy and articles made from it possesses high resistance to ballistic action of various projectiles due to optimal strength characteristics, optimal structure and plasticity characteristics.

EFFECT: high resistance to ballistic action of projectiles; enhanced corrosion resistance and weldability; reduced mass.

3 cl, 1 dwg, 3 tbl, 3 ex

FIELD: nonferrous metallurgy.

SUBSTANCE: invention is intended for use in metallurgy, mechanical engineering, and aircraft industry, in particular for manufacturing honeycomb structures. Alloy is composed of, wt %: magnesium 8-10, manganese 0.1-0.15, zirconium 0.15-0.2, cobalt 0.05-0.2, boron 0.005-0.007, beryllium 0.001-0.02, iron 0.15-0.2, silicon 0.15-0.2, titanium 0.1-0.2, aluminum - the balance. Ingot for manufacturing structural foil is obtained by semicontinuous casting in rotary crystallizer at volumetric cooling 4-20°C/sec. Structural foil manufacturing process comprises homogenization, hot rolling, annealing, cold rolling followed by annealing in air atmosphere, second cold rolling followed by annealing, and final cold rolling.

EFFECT: increased strength of alloy at ambient and elevated temperatures and improved processability un rolling stage.

3 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: said utility invention relates to the manufacture of products of a rolled aluminium alloy highly resistant to damage. The method involves casting an ingot with a chemical composition selected from the group consisting of AA2000, AA5000, AA6000, and AA7000 alloys, homogenisation and/or heating of the ingot after casting, hot rolling of the ingot into a hot-rolled product and, optionally, cold rolling of the hot-rolled product into a cold-rolled product. After the hot rolling, the hot-rolled product is cooled from the hot-rolling mill output temperature (Tout) to 150°C or lower, at a controlled cooling rate decreasing within the set range according to a continuous cooling curve determined using the following expression: T(t)=50-(50-Tout)eα-t, where T(t) is the cooling temperature (°C) as a function of the cooling time (hours), t is the cooling time (hours), and α is a parameter determining the cooling rate, within a range of -0.09±0.05 (hr-1).

EFFECT: enhanced impact strength; resistance to growth of fatigue cracks, and corrosion resistance without strength deterioration.

19 cl, 7 tbl, 1 dwg, 2 ex

FIELD: metallurgy; alloys.

SUBSTANCE: alloy and products out of this alloy contain the following elements, mas.% magnesium 0.6-1.2; silicon 0.6-1.2; manganese 0.3-1.0; iron 0.1-0.5; copper 0.05-1.0; titanium 0.005-0.05; at least one element out of the group: tin 0.6-1.0; bismuth 0.2-0.8; at least one element of the group: gallium 0.001-0.05; calcium 0.001-0.05; at least one element from the group: boron 0.0005-0.005; carbon 0.0001-0.005; aluminium - the rest.

EFFECT: there obtained an alloy and products out of it not containing lead and possessing upgraded machinability, high corrosion resistance and strength.

2 cl, 4 dwg, 2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: alloy contains following components, wt %: magnesium 4.1-4.9, titanium 0.01-0.04, beryllium 0.0001-0.005, zirconium 0.05-0.12, scandium 0.17-0.30, cerium 0.0001-0.0009, manganese 0.19-0.35, chromium 0.01-0.05, group of elements, containing iron and silicon 0.06-0.25, aluminium is the rest, at that value of iron content relation to silicon content has to be not less than unity.

EFFECT: increased strength property, strength of welded connection at cryogenic temperatures, weight saving of welded fabrication, manufactured from suggested alloy.

2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to deformed thermally hardened high-tensile aluminium alloys Al-Zn-Mg-Cu designed for fabrication of all kinds of deformed semi-finished products, including thin sheets used in aircraft and machine engineering and other branches of industry. Deformed alloy on base of aluminium and an item out of it contain the following components, wt %: zinc 2.5-4.0, magnesium 4.1-6.5, copper 0.2-1.0, iron to 0.25, silicon to 0.15, scandium 0.005-0.3, zirconium 0.005-0.25, nickel and/or cobalt to 0.1, titanium to 0.15, boron and/or carbon to 0.05, at least one element out of group: hafnium to 0.15, molybdenum to 0.15, cerium to 0.15, manganese to 0.5, chromium to 0.28, yttrium to 0.15, vanadium to 0.15, niobium to 0.15, aluminium and unavoidable impurities - the rest, also ratio of Mg contents to Zn contents is more or equal to 1.1.

EFFECT: production of alloy and items out of it possessing raised strength properties at simultaneous increased wear-resistance, reduced rate of crack growth, increased durability of welded connections and reduced density, which results in increased resource and reliability of items operation and in reduced weight of structures.

3 cl, 2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: Invention relates to metallurgy and may be sued in producing strained semi-finished products from thermally non-hardenable welded aluminium-based alloys used as structural and semiconductor material, primarily, in aerospace and nuclear engineering. Aluminium-base alloy comprises the following components in wt %: magnesium - 1.8-2.4, scandium - 0.2-0.4, zirconium - 0,1-0.2, cerium - 0.0001-0.005, iron - 0.01-0.15, silicon - 0.01-0.1, aluminium making the rest. Note here that iron-to-silicon content ratio may not be less than unity.

EFFECT: higher strength and conductivity, hence, reduced weight.

2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: aluminium-based alloy contains the following, wt %: zinc - 6.35 - 8.0, magnesium - 0.5 - 2.5, copper - 0.8 -1.3, iron - 0.02 - 0.25, silicon - 0.01 - 0.20, zirconium - 0.07 - 0.20, manganese - 0.001 - 0.1, chrome - 0.001 - 0.05, titanium - 0.01 - 0.10, boron - 0.0002 -0.008, beryllium - 0.0001 - 0.05, at least one element from potassium, sodium, calcium group in quantity of 0.0001 - 0.01 each, aluminium is the rest; at total content of zinc, magnesium, copper within 8.5-11.0, and that of zirconium, manganese and chrome - within 0.1-0.35. Method involves loading and melting of charge components, flux treatment of molten metal, molten metal purification, further vacuum treatment of molten metal in mixer and casting of ingots; boron is added to molten metal in the form of Al-Ti-Be alloy which is distributed at least one hour before molten metal pouring to mixer along the whole surface area of mixer bottom; at that, mixer is pre-heated to temperature which is by 15-30C more than molten metal temperature, and vacuum treatment of molten metal in mixer is performed at temperature of 695-720C, during 45-90 minutes.

EFFECT: invention allows obtaining high-strength aluminium alloys with absence of primary intermetallic compounds, decreased content in them of non-metallic inclusions and dissolved gases, with stable properties and optimum size of grain on basis of standard furnace and process equipment.

2 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: aluminium alloy contains the following components: from 4.5 to 6.5 wt % magnesium, from 1.0 to 3.0% wt % silicon, from 0.3 to 1.0% wt % manganese, from 0.02 to 0.3% wt % chromium, from 0.02 to 0.2% wt % titanium, from 0.02 to 0.2 wt % zirconium, from 0.0050 to 1.6% wt % of one or more rare-earth metals, max. 0.2% iron, and the rest is aluminium.

EFFECT: alloy has high strength properties and is intended for use in die casting and related methods.

8 cl, 1 tbl

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