Aluminum-based alloy and articles made from this alloy

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

 

The invention relates to the field of metallurgy alloys based on aluminum, in particular aluminum-based alloy system Al-Mg-Mn, used for the manufacture of armour and semi-finished products used in the aircraft and shipbuilding, production of armored ground vehicles and other objects of civil and special purpose.

The greatest application in the manufacture of armour and semi-finished products aluminum alloys of two systems: Al-Zn-Mg (Vielen, Who, Amidic Structure and properties of alloys of the system Al-Zn-Mg, M: metallurgy, 1982, s) and Al-Mg-Mn (Aluminum. Properties and physical metallurgy. Edited Cehat, M.: metallurgy, 1989, s).

In accordance with military standards: MIL-A-46027 F (MR) and MIL-A-46063 E (copies of standards can be obtained from the order Department of standardized documents to: Standartization Documents Order Desk, Bidg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, approved for use without any restrictions) armour manufactured from alloys based on aluminum must be able to withstand ballistic impact of two different types of shells fired at a given angle to the target. One of them is the armor-piercing projectile (type AR)used for end-to-end armor penetration, which is characterized by a sharp shock end. The other is that shrapnel shell (type FS), characterized by a blunt impact end and consequently tending to the creation of metal fragments from the inner side of the armor, even if the projectile fails to break through. So speed less than the speed of penetration should be taken into account when testing the armor projectile type FS.

As practice shows, the aluminum alloys of the same system that is used for making armor, superior aluminum alloys other system in the case of one type of projectile, can yield aluminum alloys of the same system in the case of the other type of projectile.

Armour semi-finished products and products made of them should have an optimum combination of certain properties, namely, to have strength characteristics sufficient to provide the desired ballistic protection level and to have a viscous metal structure and high levels of plasticity, the combination of which will reduce or eliminate the formation of metal fragments from the inner side of the armor and thus provide improved performance for both types of shells.

In addition, it is important that the stability of these properties over time.

It should be noted that armour semi-finished products and products made from alloys based on aluminum are not only used where resistance score the socialist influence, but also in cases when important factors are weight reduction, high corrosion resistance, weldability. As practice shows, the corrosion resistance and weldability are also can vary for various alloys.

Known alloy based on aluminum - 7039 (designation of the alloy is in accordance with the numbers of alloys and meets the definitions registered with the Aluminum Association, Washington, DC, USA), used for the manufacture of armour and semi-finished products containing, wt.%:

Magnesium2,3-3,3
Manganeseof 0.1-0.4
Zinc3.5 to 4.5
Chrome0,15-0,25
Titanium0.1
Silicon0.3
Iron0.4
Copper0.1
Aluminumrest

(Military standard USA: MIL-A-46063 E).

The disadvantages of this alloy are increased the cost of the alloy, the increased weight of armour semi-finished products, the high complexity of manufacturing and low quality armor semi-finished products.

The reasons for the occurrence of the above shortcomings when is ispolzovanie known alloy, is that in the known alloy high content of zinc, having a high density and high cost; manufacturing technology of alloy semi-finished products and products contains additional operations - quenching and aging, including finished products; increased strength and reduced ductility of the alloy leads to a relatively low resistance armour semi-finished products and products impact projectiles type FS and, as a consequence, the presence of metal fragments inside, furthermore, when the through-penetration armour semi-finished products and products projectile type AR observed coloration of the core of the projectile into separate fragments; high content of zinc, as well as high the total content of zinc and magnesium in the alloy affects its corrosion resistance (Vielen, Who, Amidic Structure and properties of alloys of the system Al-Zn-Mg. M.: metallurgy, 1982, s); the difference of the mechanical properties of the weld, heat affected zone and base metal results in lower resistance weld ballistic impact and corrosion (Lphmodule Structure and properties of aluminum alloys, M.: metallurgy, 1979, s).

Known alloy based on aluminum, used for the manufacture of armored semi-finished products and products containing, wt.%:

Magnesium
2,6-3,5
Manganese0,2-0,45
Zinc5,5-6,3
Chrome0,2-0,4
Titaniumof 0.1-0.3
Silicon0.2
Iron0.3
Copper0.2
Aluminumrest

Moreover, the total content of zinc and magnesium is 9.0-10.4 wt.%, and the ratio of zinc content to the magnesium content of between 2.0 and 2.8.

(Patent RF №2044098, IPC6With 22 21/10, published in Gazette No. 26 of 1995)

The disadvantages of this alloy are increased the cost of the alloy, the increased weight of semi-finished products and products, the high complexity of manufacturing and low quality semi-finished products and products.

The reasons for the occurrence of the above shortcomings when using the known alloy, is that in the known alloy high content of zinc, having a high density and high cost; manufacturing technology of alloy semi-finished products and products contains additional operations - quenching and aging, including finished products; increased total content of zinc and magnesium further increases the strength and decreases the ductility of the alloy (Vielen, Who, Amiri The Structure and properties of alloys of the system Al-Zn-Mg. M.: metallurgy, 1982, s.138), which further lowers the resistance of the semi-finished products and products impact projectiles type FS and, as a consequence, the presence of metal fragments inside; moreover, when the through-penetration of semi-finished products and products projectile type AR observed coloration core shell portions; optimal from the point of view of mechanical and ballistic properties of the ratio of zinc and magnesium alloys of this system (2, 5) adversely affects the weldability (Vielen, Who, Amidic Structure and properties of alloys of the system Al-Zn-Mg. M.: metallurgy, 1982, p.142); high content of zinc, as well as a high total content of zinc and magnesium in the alloy affects its corrosion resistance (Vielen, Who, Amidic Structure and properties of alloys of the system Al-Zn-Mg. M.: metallurgy, 1982, s); the difference of the mechanical properties of the weld, heat affected zone and base metal results in lower resistance weld ballistic impact and corrosion (Lphmodule Structure and properties of aluminum alloys, M.: metallurgy, 1979, s).

Thus, armored semi-finished products and products made of alloys of the system Al-Zn-Mg are characterized by reduced performance due to increased weight, poor weldability and low quality of the welded seam is, but in General favorable ballistic armor semi-finished products and products demonstrated during ballistic impact projectiles of the type AR, seriously deteriorate in time due to their low corrosion resistance.

Known alloy based on aluminum - 5083 (designation of the alloy is in accordance with the numbers of alloys and meets the definitions registered with the Aluminum Association, Washington, DC, USA), used for the manufacture of armored semi-finished products and products containing, wt.%:

Magnesium4,0-4,9
Manganese0,4-1,0
Zincto 0.25
Chrome0,05-0,25
Titaniumto 0.25
Silicon0.4
Iron0.4
Copper0.1
Aluminumrest

(Military standard MIL-A-46027 N (MR)).

The disadvantage of this alloy is low quality semi-finished products and products.

The reasons for the occurrence of the above drawback when using the known alloy, is that known alloy is characterized by reduced strength and increases the authorized plasticity and, as a consequence, relatively low resistance to projectiles of the type AR; moreover, the high content of silicon (more than 0.3 wt.%) reduces the strength characteristics of the alloy (Industrial aluminum alloys Ref. Ed. Aliyev YEAR, Altman MB, Hambardzumyan S.M., etc., M.: metallurgy, 1984, p.47).

The closest alloy chemical composition and purpose of the claimed alloy based on aluminum is an alloy that contains, wt%:

Magnesium5,0-6,5
Manganese0,6-1,2
Zinc0.75
Chrome0.2
Titaniumto 0.15
Silicon0.4
Ironto 0.27
Copper0.1
Zirconiato 0.15
Aluminumrest

Moreover, the total content of magnesium and manganese is 6.0 to 6.7 wt.%.

(U.S. patent No. 4469537, IPC6With 22 21/06.

The disadvantage of this alloy, taken as a prototype, is the low quality of semi-finished products and products.

The reasons for the occurrence of the above shortcomings when using the known alloy adopted for the Protocol is IP, is that a known alloy is characterized by low strength and high ductility and, as a consequence, relatively low resistance to armor-piercing shells with sharp percussion end; an increased silicon content (more than 0.3%) slightly reduces the strength characteristics of the alloy (Industrial aluminum alloys Ref. Ed. Aliyev YEAR, Altman MB, Hambardzumyan S.M., etc., M.: metallurgy, 1984, p.47); moreover the high content of zinc adversely affect corrosion resistance.

The problem to which the invention is directed is the development of armour alloy based on aluminum, designed for the manufacture of his armour semi-finished products and products that are free from the disadvantages listed above and inherent in the known technical solutions. Technical result achieved in the implementation of the invention is to obtain alloy and semi-finished products and products that combines the best performance characteristics of semi-products and products derived from the above alloys of the system Al-Mg-Mn and Al-Zn-Mg, namely strengthening the resilience of semi-finished products and products made according to this invention, ballistic impact of various types of shells due to achieve continuous time optimal about the surface characteristics, optimal structure and characteristics of plasticity, as well as to improve the corrosion resistance and had such positive properties, good weldability and low weight.

Tasked with achieving the mentioned technical result in the implementation of the invention is solved in that the known alloy based on aluminum, used for the manufacture of armored semi-finished products and products containing magnesium, manganese, zinc, chromium, titanium, silicon, iron, copper, zirconium, optionally, contains at least one element selected from the group comprising scandium, beryllium, yttrium, neodymium, cerium in the following ratio, wt.%:

Magnesiumof 4.2 to 6.5
Manganese0.5 to 1.2
Zinc0.2
Chrome0.2
Titaniumto 0.15
Siliconto 0.25
Iron0.30
Copper0.1
Zirconia0,05-0,3

At least one element selected from the group comprising, by wt.%:

Scandium0,05-0,3
Berylliumof 0.0001 to 0.01
Yttrium0,001-0,1
Neodymium0,001-0,1
Cerium0,001-0,1
Aluminumrest

Alloy based on aluminum, used for the manufacture of armour and semi-finished products, differs from the prototype as qualitatively (optionally contains at least one element selected from the group comprising scandium, beryllium, yttrium, neodymium, cerium)and quantitatively (low content of zinc, silicon, high content of zirconium).

In the alloy is supported by a certain ratio of magnesium and manganese, necessary to achieve the optimum combination of strength and plastic characteristics armour alloy. While increasing the positive impact of these elements on the ballistic characteristics of the semi-finished products of alloy is achieved by the introduction of an alloy of additional alloying elements.

We have found that by introducing into the composition of the alloy used for the manufacture of armour and semi-finished products, at least one element selected from the group comprising scandium, beryllium, yttrium, neodymium, cerium, in specified quantities, there is a sudden increase in the resistance of the semi-finished products and products ballistic impact for different the x types of shells, because achieving optimum mechanical characteristics of the alloys of this assignment, namely to increase to the desired level of tensile strength, yield strength and relative elongation, the desired structure of the alloy.

The introduction of one or more elements from the group of scandium, beryllium, yttrium, neodymium, cerium, in specified quantities, contributes to the formation of homogeneous, fine-grained structure, inhibition of recrystallization processes, achieving optimal for armour alloy ratios of strength and plastic characteristics. When the content (together or separately) of scandium and beryllium, respectively, below 0.05 and 0.0001 wt.%, and yttrium, neodymium, cerium lower than 0.001 wt.% reduced strength properties of the alloy, and when the content (together or separately) of scandium and beryllium, respectively, above 0.3 and 0.01 wt.%, and yttrium, neodymium, cerium above 0.1 wt.% reduced plastic properties of the alloy.

Zirconium in a quantity of 0.05 to 0.3 wt.% is modifying additive and provides structural reinforcement in the semis. When the zirconium content of less than 0.05 wt.% reduced strength properties of the alloy, the zirconium content more than 0.3 wt.% fall of the plastic properties of the alloy.

The lower content of zinc, silicon, up to 0.2 wt.% and 0.25 wt.% respectively produced with the aim of improving sariva is on and increase the corrosion resistance of the alloy.

Of the proposed alloy based on aluminum can be made of various semi-finished products: sheets and plates, stamping, extruded products. Products offered alloy can be obtained in various products, such as panels for covering the wings and fuselage of the aircraft, buildings helicopters, tanks, hull design lungs of marine and river vessels and their add-ons, chassis of vehicles, etc.

In the offered product is made from an alloy based on aluminum, used for the manufacture of armored semi-finished products, technical result is achieved by the fact that as the workpiece material alloy is used in the following ratio, wt.%: magnesium 4.2 to 6.5; manganese 0.5 to 1.2; zinc to 0.2; chrome 0.2 titanium to 0.15; silicon up to 0.25; iron to 0.3; copper 0.1; zirconium 0.05 to 0.3; the at least one element selected from the group comprising scandium 0,05-0,3; beryllium of 0.0001 to 0.01; yttrium 0,001-0,1; neodymium 0,001-0,1; cerium 0,001-0,1; aluminum else.

The invention is illustrated in the graph showing the effect of the chemical composition of the alloy on the mechanical properties of armored semi-finished products and products.

The significance of the chemical composition of the alloy for the manufacture of, in particular, armor plates and plates is illustrated in the diagram, which shows the increase in strength and plastic characteristics bronepaketom and plates, which are directly related to higher level of ballistic protection for the different types of shells (AP and FS). This increase can be achieved by introducing into the composition of the alloy is at least one element selected from the group comprising scandium, beryllium, yttrium, neodymium, cerium, and decrease the content of silicon and zinc. These data represent the mapping examples for the three alloys: alloy And alloy 5083 alloy In the alloy according to U.S. patent No. 4469537, the alloy With the alloy in accordance with the present invention.

To test ballistic properties were used plate with a thickness of about 38.1 mm, obtained from ingots cast from alloys 1, 2, 3, 4, 5, 6, 7, 8. The compositions of these alloys are given in table 1.

Additionally, was cast and rolled ingot of the alloy 7039 before experienced the plate thickness of 38.1 mm on traditional technology for this alloy for this purpose.

It should be noted that the casting and rolling was carried out on industrial equipment that is manufactured on an industrial scale alloys of these systems.

Ballistic properties of the plates were determined by shelling plates cartridges of 7.62 mm (type AR) and shells of caliber 30 mm (type FS).

Before the test armour plates have undergone thermal processing at a temperature of 14°With a duration of at least 8 hours.

Plate octanal who were at a distance of 58 metres at an angle of deviation 0° . For examinees bronwyne plates parallel to them at a distance of 15 cm were installed sheets"witnesses" of aluminum alloy 2024-T3 thickness of 0.5 mm, Determine the ballistic limit protection consisted of an equal number of scoring strokes projectiles at speeds of full and partial penetration. Under the credit impact refers to the impact, which occurred the defeat of the test sheet shell under normal flight conditions and separated from another strike or away from edges, holes, cracks or other undamaged zones have a length of not less than two calibers. Under full penetration means the breaking, in which the projectile or one or more fragments of the projectile or of the sheet passes beyond the reverse side of the test sheet and punch list"witness". Under partial penetration refers to the strike, which occurred the defeat of the test sheet (breakout, the output of the core of the projectile from the plate, having bruised on the inside, cracks etc), but not related to a complete crash.

All the ballistic limits of protection was calculated based on the highest speed of the projectile for partial penetration and the lowest rate of the projectile for full penetration. Firing continued until was reached ballistic protection limit of four series of Wattrelos maximum separation speed of 18.3 m / sec or ballistic limit protection of the six series of shots with a maximum spacing of speed compared to 27.4 meters per second. Under the separation refers to the difference between the highest speed of the projectile in case of partial penetration and the lowest speed of the projectile at full penetration.

Bullet speed selected by the change in weight of the sample powder. The velocity measured by the station "Ray-81".

The results of the mechanical and ballistic tests are presented in table 2.

The data in table 2 show the improved ballistic properties armour semi-finished products and products resulting in increased need to defeat armored semi-finished products and products speed projectiles), the improvement achieved by increasing the strength and plastic properties of semi-finished products, increasing the viscosity of the metal structure.

Tests for corrosion under tension were carried out on plates obtained from the alloys identified in table 1. Ring samples (C-shaped ring)cut from the plates in the transverse to the rolling direction, were immersed in 3.5% NaCl solution prepared with distilled water, under voltage 206,4 MPa in the transverse direction. This direction was chosen because aluminum alloys are most susceptible to corrosion under tension in this direction. The immersion was carried out for 10 minutes during each hour, with subsequent 50-minute air drying. This cycle was repeated throughout segosphere, which was determined in 30 days.

Tests on the quality of the welding was carried out on plates obtained from the alloys identified in table 1. Samples for testing as weldability were obtained in the following way, pre-treated chemically to the surface of the base metal and welding (filler) wire was subjected to arc welding in inert gas. As welding (filler) wire was used wire of alloy AMg5.

Tests on the quality of weldability samples from armor plates was made

for penetration through the seam running liquid (kerosene);

- determination of mechanical properties tensile samples taken from the zone of the weld to determine the effectiveness of the weld.

The test results of sample plates for corrosion under tension and as weldability are given in table 3. The data shown in table 3, show improved corrosion resistance and quality of welds.

Thus, the use of the alloy will allow you to get armour semi-finished products and products with improved ballistic properties when exposed to different types of shells, high corrosion resistance and weldability, low weight.

Example 1

Alloy compositions 3, 4, 5, 6 is Holocene plate thickness of 38.1 mm from the ingot section 260× 1500 mm on the following technology: homogenization of the ingot at a temperature of 470-490°within 12 hours, hot rolling at a temperature of 420-450°to a thickness of 65 mm, cold rolling to a thickness of 38.1 mm, edit slabs stretching.

Example 2

Alloy composition 3 obtained molded strip section 20×60 mm from the pre-olgamorantearevalo ingot with a diameter of 70 mm at a temperature of 470-490°C for 12 hours. The temperature of the pressing 380-400°C.

Example 3

Of the proposed alloy composition 3 received punching a wall thickness of 60 mm from the round ingot with a diameter of 400 mm on the following technology: homogenization of the ingot at a temperature of 470-490°within 12 hours, forging at a temperature of 370°With the total deformation rate of 40%, annealing at a temperature of 320-340°C for 8 hours, pre-forming at a temperature of 380°with a total degree of deformation of 30%, annealing at a temperature of 320-340°C for 6 hours, the final stamping when the temperature 380°With the total deformation rate of 40%.

5

6
Table 1
Alloyno part of SavaContent, wt.%
MgMnZnCrTii FeCuZrScBeYNdCEAl
50831a 4.90,90,250,180,250,40,40,1Rest
For U.S. patent No. 446953725,50,80,750,150,150,40,270,10,14The same
Offer35,50,90,180,150,10,20,30,10,170,2----The same
44,30,80,20,150,150,250,20,10,150,150,0050,05--The same
5,0

6,2
0,6

1,15
0,17

0,19
0,1

0,15
0,1

0,12
0,15

0,2
0,25

0,3
0,1

0,1
0,25

0,15
-

-
-

0,008
0,06

-
0,1

0,09
-

0,07
The same

The same
Experienced75,21,00,10,140,150,150,30,10,150,40,02-0,20,2The same
86,30,60,20,10,10,20,250,10,250,001-0,00050,00050,0001The same

Table 2
AlloyNo. of composition of the alloyThickness, mmMechanical propertiesBallistic protection level, m/s
σin, MPaσof 0.2M is and δ, %7.62 mm armor-piercing30 mm high
5083138,13702558718732
Alloy for U.S. patent No. 44695372to 38.339027011725,2739,3
Offer3

4

5

6
38,3

37,9

38,1

38,0
406

412

409

411
290

295

293

294
15

14

14

14
737,5

740,3

738,2

741,5
750,5

752,1

745,6

749,2
Experienced7

8
38,2

of 37.8
398

387
265

278
8

11
727,1

719,4
732,5

738,0
70399to 38.342430110721,6735,7

1. Alloy based on aluminum, used for the manufacture of armored semi-finished products and products containing magnesium, manganese, zinc, chromium, titanium, silicon, iron, copper, zirconium, characterized in that it additionally contains at least one element selected from the group including scandium, beryllium, yttrium, neodymium, cerium in the following ratio, wt.%:

Magnesiumof 4.2 to 6.5
Manganese0.5 to 1.2
Zinc0.2
Chrome0.2
TitaniumTo 0.15
SiliconTo 0.25
Iron0.3
Copper0.1
Zirconia0,05-0,3

at least one element selected from the group comprising, by weight%:

Scandium0,05-0,3
Berylliumof 0.0001 to 0.01
Yttrium0,001-0,1
Neodymium0,001-0,1
Cerium0,001-0,1
AluminumRest

2. The product from an alloy based on aluminum, used for the manufacture of armored semi-finished products, characterized in that as the workpiece material used alloy in the following ratio, wt.%: magnesium 4.2 to 6.5; manganese 0.5 to 1.2; zinc - 0.2; chrome - 0.2; titanium, 0.15; silicon up to 0.25; iron - 0.3; copper - 0.1; zirconium - 0,05-0,3 at least od the n element, selected from the group comprising scandium - 0,05-0,3; beryllium is 0.0001 to 0.01; the yttrium - 0,001-0,1; neodymium - 0,001-0,1; cerium - 0,001-0,1; aluminum - rest.



 

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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 15-30°C more than molten metal temperature, and vacuum treatment of molten metal in mixer is performed at temperature of 695-720°C, 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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