High-strength alloy on base of aluminium

FIELD: metallurgy.

SUBSTANCE: alloy on base of aluminium contains following components wt %: zinc 5-8, magnesium 2-3.1, nickel 1-4.2, iron 0.02-1, zirconium 0.02-0.25 %, copper 0.05-0.3 %. Also, temperature of equilibrium solidus of material is as high as 550°C and hardness is as high as 180 HV. Alloy has a structure corresponding to matrix formed with solid solution of aluminium with uniformly distributed disperse particles of secondary discharges in it and particles of aluminides containing nickel and iron of eutectic origin uniformly distributed in matrix. Also, alloy contains matrix and aluminides at the following ratio, vol % aluminides containing nickel and iron 5.0-6.3, matrix - the rest.

EFFECT: production of new high-strength alloy thermally hardenable and designed both for fabrication of shaped casting and of deformed semi-products.

4 cl, 5 tbl, 4 ex

 

The invention relates to the field of metallurgy materials based on aluminum and can be used to obtain products operating under high loads at temperatures of 150-200°C: details of aircraft (airplanes, helicopters, rockets, cars and other vehicles (bicycles, scooters, trucks), details of sports equipment (corps of Golf clubs for Golf, tennis racket) and other

The most durable wrought aluminum alloys type B95 (σin=500-600 MPa) refer to the system Al-Zn-Mg-Cu (Industrial aluminum alloys /Ref. ed./ Aliyev YEAR, Altman MB and other M, metallurgy, 1984, 528 C.). They have a low casting properties, therefore, these alloys are not used to obtain shaped castings.

Known alloy based on aluminum-Nickel eutectic, disclosed in the patent RU 2158780 from 10.11.2000,

This alloy contains a matrix formed of a solid solution of zinc, magnesium and copper in aluminum with uniformly distributed dispersed particles of the phases formed by aluminum, zinc, magnesium and copper, uniformly distributed in the matrix particles of Nickel aluminides crystallization of origin and uniformly distributed in the matrix particles, at least one of the aluminides, selected from the group composed of chromium aluminides and aluminides zircon is I, when the total content of from 0.1 to 0.5 vol.% material.

This alloy can be to get castings with improved casting properties due to additives of Nickel, which forms aluminides eutectic origin.

However, to achieve high strength properties, you must ensure that these aluminides globular form, which requires the operation of spheroidizing annealing. As copper, which is a known material, greatly reduces the equilibrium solidus (medium composition, it is below 530°C), requires a relatively high dispersion of the original structure, which limits the use of the proposed alloy is relatively small castings simple form. In addition, the presence of copper in the last complicates the phase composition, which can lead to instability of the mechanical and technological properties.

The closest to the invention is an alloy based on aluminum, disclosed in the patent RU 2245388 (publ. 27.01.2005, bull. No. 3). This alloy contains zinc, magnesium and Nickel and is characterized by a structure representing a matrix formed of a solid solution of aluminum with uniformly distributed therein dispersed secondary discharge phase of the hardener, and uniformly distributed in the matrix particles of Nickel aluminides crystallization of origin. The number of aluminides n the Kehl is 5.3-7 vol.%, matrix as dispersed particles contains 5-10% vol. particle phase T', which is metastable modifications phase T (Al2Mg3Zn3), and the temperature of the equilibrium solidus of the material is not less than 540°C.

This alloy can be to get castings with improved combination of mechanical properties and processability (shaped casting and pressure treatment). However, for the preparation of this alloy requires aluminum of high purity, which makes it difficult industrial use. The second drawback is the strong tendency of the deformed semi-finished products to recrystallization during heating for quenching, which limits the level of their strength.

Object of the invention is the creation of new high-strength aluminum alloy, produced on the basis of technical aluminum and designed to provide both shaped castings and deformed semi-finished products.

The problem is solved by the fact that the base alloy of aluminum containing zinc, magnesium and Nickel, additionally contains iron, zirconium and copper at the following component ratio, wt.%:

Zinc5-8
Magnesium2,0-3,1
Nickel 1-4,2
Iron0,02-1
Zirconia0,02-0,25
Copper0,05-0,3
AluminumRest

and at this temperature the equilibrium solidus is not less than 550°C, and the hardness is not less than 180 HV.

Achieving high mechanical properties is achieved by the implementation of patterns representing a matrix formed of a solid solution of aluminum dispersed uniformly distributed particles of secondary allocations, and uniformly distributed in the matrix particles aluminides containing Nickel and iron, eutectic origin. The number of these aluminides is 5,0-6,3%vol.

Determination of the equilibrium temperature of the solidus, and the volume fraction of aluminides containing iron and Nickel, is performed using thermo-Calc database TTAL5 or later).

The material may be in the form of castings, with the following properties tensile: tensile strength (σin) - not less than 610 MPa, the yield stress (σof 0.2) - not less than 550 MPa, elongation (δ) - not less than 4%.

Furthermore, the material may be in the form of strain is s semi-finished products (in particular, sheets and rods)with the following properties tensile: tensile strength (σin) not less than 640 MPa, the yield stress (σof 0.2) not less than 550 MPa, elongation (δ) of not less than 5%.

The invention consists in the following.

The presence of alloying elements in the claimed limits with regard to hardness allows you to provide the best combination of mechanical properties. The stated temperature limits of the equilibrium solidus allows spheroidizing annealing at a sufficiently high temperature, generating a relatively globular particles of aluminides, in particular phases of Al3Ni and Al9FeNi. The last number in the claimed limits allows you to provide the best combination of mechanical and technological properties and to allow the use of aluminum for the preparation of alloy.

EXAMPLE 1.

Were prepared ingots 5 alloys whose composition is shown in table 1. The alloys were prepared in an electric resistance furnace in gravitometric crucible of aluminum grades A99 motorway (99.99%) and A7 (99,7%), zinc brand C (99,9%), magnesium brand Mg (99,9%), copper mark M1 (99,9%) and ligatures Al-Ni, Al-Fe and Al-Zr.

Determination of the equilibrium temperature of the solidus, and the volume fraction of aluminides containing iron and Nickel, was performed using the software who we are Thermo-Calc database TTAL5). The calculated values are given in table 2.

Casting thermoablative on the treatment T6 (two-stage heating for hardening, quenching in cold water and aging). The Vickers hardness was determined according to GOST 2999-75. Experimental values are given in table 2.

Table 1
The compositions of the experimental alloys
No.Zn, %Mg, %Ni %Fe %Zr %Cu, %Al
141,50,50,010,010,02leave
253,14,20,020,020,3leave
36,72,820,40,2leave
482,0110,250,05leave
58,53,54,51,20,30,5leave

Table 2
Characteristics of the experimental alloys in ingots
No.Q1,.%Ts, °CHV
Al3NiAl9FeNiAmount
10,720,140,8660790
26,090,20 6,29553185
30,24the ceiling of 5.60of 5.84554192
405,015,01569187
5015,2715,27485210
635,3-7-5,3-7≥540≥160 HB
1the volume fraction of inclusions of aluminides (Al3Ni and/or Al9FeNi);
2temperature equilibrium solidus;
3prototype (patent RU 2245388)

From table 2 it is seen that only the claimed alloy (compounds 2-4) provides the required values of Q, Tsand HV. In alloy 1 number of phases and hardness below the required level. In alloy 5 value Tsbelow the required level and the value of Q, on the contrary, above.

In the alloy prototype guaranteed value of Tsis unacceptably low (540°C), making it difficult to obtain globular inclusions in the process of spheroidizing annealing. This full the binding of Nickel in the phase of Al3Ni requires very strict limitations on the concentration of iron in the alloy: less than 0.01%. This implies the need to use high purity aluminum for melting alloy (in the examples in the patent RU 2245388, used aluminium 99.99%purity). In the proposed alloy iron concentration can reach 1% (composition No. 4).

EXAMPLE 2.

Alloys No. 1, No. 3 and No. 5 (table 1) were obtained in the form of shaped castings by the method of liquid stamping. Castings of alloy No. 3 did not contain any casting defects and casting of alloys No. 1 and No. 5 had a crack, so the mechanical properties are not defined. After the heat treatment, providing hardness specified in table 2, was determined mechanical properties on cylindrical specimens cut from castings of alloy No. 3, according to GOST 1497-84.

From table 3 it is seen that the alloy of the claimed composition is markedly superior to the alloy prototype on the strength properties.

Table 3
The mechanical properties of the experimental alloy and the second world war in castings
Alloyσin, MPaσof 0.2, MPaδ, %
№316205504,5
The placeholder2>510>420>4
1in table 1,2the patent RU 2245388

EXAMPLE 3.

Alloy No. 3 (table 1) was obtained in the form of 2 mm sheets on the technology, which included the following:

- getting a flat ingot;

- homogenization annealing at a maximum temperature of 10°C below Ts,

- hot rolling with a degree of compression of about 90%,

- heating for hardening,

- quenching in cold water,

- aging.

After the heat treatment, providing hardness specified in table 2, was determined mechanical properties on flat samples cut from the sheets, according to GOST 1497-84.

From table 4 it is seen that the alloy of the claimed composition (No. 3) is markedly superior to the alloy prototype on the strength properties.

Table 4
Mechanical properties of experimental alloys in sheets
Alloyσin, MPaσof 0.2, MPaδ, %
№316505605,5
The placeholder2>570>480>5
1in table 1,2the patent RU 2245388

EXAMPLE 4.

Alloy No. 3 (table 1) was obtained in the form of 12 mm bars on the technology, which included the following:

- getting round ingot,

- homogenization annealing at a maximum temperature of 10°C below Ts,

hot pressing with a degree of compression of about 90%,

- heating for hardening,

- quenching in cold water,

- aging.

After the heat treatment, providing hardness specified in table 2, was determined mechanical properties on cylindrical samples, turned from bars, rods, GOST 1497-84.

From table 5 it is seen that the alloy of the claimed composition (No. 3) is markedly superior to the alloy prototype on the strength properties.

Table 5
Mechanical properties of experimental alloys in rods
Alloyσin, MPaσof 0.2, MPaδ, %
316705806
The placeholder2>570>480>5
1in table 1,2the patent RU 2245388

1. The base alloy of aluminum containing zinc, magnesium and Nickel, characterized in that it additionally contains iron, zirconium and copper at the following component ratio, wt.%:

zinc5-8
magnesium2-3,1
Nickel1-4,2
iron0,02-1
Zirconia0,02-0,25
copper0,05-0,3
aluminum the rest,

at this temperature the equilibrium solidus is not less than 550°C, and the hardness is not less than 180 HV.

2. The alloy according to claim 1, characterized in that it is characterized by a structure in a matrix formed of a solid solution of aluminum with uniformly distributed therein dispersed particles of the secondary discharge and uniformly distributed therein particles of aluminides containing Nickel and iron, eutectic origin, when this alloy contains a matrix and aluminides in the following ratio,%:

Aluminides containing Nickel and iron5,0-6,3
Matrixthe rest of it.

3. The alloy according to claim 1 or 2, characterized in that it is obtained in the form of castings, with the following properties tensile: tensile strength σin- not less than 610 MPa, yield strength σof 0.2- not less than 550 MPa, elongation δ is not less than 4%.

4. The alloy according to claim 1 or 2, characterized in that it is obtained in the form of deformed semi-finished products with the following properties tensile: tensile strength σin- at least 640 MPa, yield strength σof 0.2- not less than 550 MPa, elongation δ is not less than 5%.



 

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Aluminum-base alloy // 2280092

FIELD: metallurgy.

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2 tbl, 1 ex

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2 cl, 2 tbl

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EFFECT: improved and valuable properties of alloy.

1 tbl

FIELD: metallurgy.

SUBSTANCE: invention proposes alloy comprising the following components, wt.-%: zinc, 4.7-5.3; magnesium, 2.1-2.6; chrome, 0.12-0.25; titanium, 0.03-0.10; zirconium, 0.07-0.12; beryllium, 0.0002-0.005; iron, 0.05-0.35; silicon, 0.05-0.25; boron, 0.0003-0.003; sodium, 0.0001-0.0008; copper, 0.2, not above, and aluminum, the balance. Proposed alloy provides enhancing the armor structure uniformity and its welded joints, to provide stable armor resistance of extended welded joints of armor and independently of location of units to be welded, to exclude splitting off from rear side of armor in case armor not piercing by a missile, to exclude possibility for decreasing tenacity of armor in exploitation including using under conditions of combination with external dynamic protection of armored-carcass and armored-carrying mechanized objects. Invention can be used in producing armor for armored-carrying equipment for protection against effect of affection agents.

EFFECT: improved and valuable technical properties of alloy.

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SUBSTANCE: invention proposes alloy comprising the following components, wt.-%: zinc, 4.7-5.3; magnesium, 2.1-2.6; manganese, 0.05-0.15; chrome, 0.12-0.25; titanium, 0.03-0.10; zirconium, 0.07-0.12; beryllium, 0.0002-0.005; iron, 0.05-0.35; silicon, 0.05-0.25; sodium, 0.0001-0.0008; copper, 0.2, not above, and aluminum, the balance. Proposed alloy provides enhancing armor structure uniformity and its welded joins, to provides stable armor resistance of armor welded joints being independently on location of units to be welded, to exclude splitting off from rear side of armor in case armor not piercing by missile, to provide high tenacity of armor including its using under conditions of combination with external dynamic protection of armored-carcass and armor-carrying mechanized objects. Invention can be used in producing armor for armor-carrying equipment for its protection against protection of affecting agents.

EFFECT: improved and valuable properties of alloy.

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SUBSTANCE: the present innovation deals with obtaining aluminum-based alloys necessary for manufacturing stampings, particularly those of automobile wheels disks. The alloy in question has got the following composition, weight%: copper 0.8-2.2; magnesium 1.2-2.6; manganese 0.2-0.6; iron ≤0.25; silicon ≤0.20; zinc 5.0-6.8; titanium ≤0.1; chromium 0.08-0.17; zirconium 0.01÷0.12; boron 0.0008-0.005; antimony 2.5-3.5; indium 2.5-3.5; boron 0.4-0.5; hydrogen (0.3-4.1)10-5, aluminum - the rest. The alloy in question is of optimal combination of strength and plasticity that guarantee the required level of performance characteristics of automobile wheels disks, the decrease of their weight in combination with high technological effectiveness at volumetric stamping, especially complex-shaped articles.

EFFECT: higher strength and plasticity of the alloy.

2 cl, 1 ex, 3 tbl

Aluminum-base alloy // 2319762

FIELD: metallurgy, alloys.

SUBSTANCE: invention relates to compositions of deformable aluminum-base alloys. Proposed alloy comprises the following components, wt.-%: zinc, 5.0-7.0; magnesium, 0.4-0.8; copper, 0.8-1.2; manganese, 0.8-1.2; zirconium, 0.2-0.3; titanium, 0.2-0.3; niobium, 0.2-0.3; nickel, 3.0-5.0; boron, 0.02-0.03, and aluminum, the balance. Proposed alloy possesses the enhanced strength. Proposed alloys can be used in aircraft construction and automobile construction.

EFFECT: improved and valuable property of alloy.

1 tbl

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