High-strength sparingly-alloyed aluminium-based alloy

FIELD: metallurgy.

SUBSTANCE: invention may be used for making critical parts operated at high loads at 150°C, e.g, those of aircraft, cars and trucks, etc. Proposed composition contains the following substances, in wt %: 5.5-6.5 Zn, 1.7-2.3 Mg, 0.4-0.7 Ni, 0.3-0.7 Fe, 0.02-0.25 Zr, 0.05-0.3 Cu. Its solvus temperature does not exceed 410°C while hardness makes, at least 150 HV.

EFFECT: higher strength and machinability.

3 cl, 3 tbl, 3 ex, 2 dwg

 

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 up to 150°C: details of aircraft (airplanes, helicopters, rockets, cars and other vehicles (including bicycles, scooters, trucks), details of sports equipment 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 others - M.: Metallurgiya, 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 zirconium aluminides, when the total content of from 0.1 to 0.5 vol.% Mat is the Rial.

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. 27.01.2011, bull.№3). This alloy contains zinc, magnesium and Nickel, 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
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.

The technical result is the creation of new high-strength alloy, capable of thermal hardening intended to obtain as shaped castings and deformed semi-finished products.

However, this alloy is not enough technological when getting rolled sheets (thickness less than 0.5 mm by cold rolling. The second drawback is that the alloy is not designed to produce shaped castings in a single form. The third disadvantage is that the alloy contains expensive additive Nickel in quantities of more than 1 wt.%.

The problem is subramania is the creation of new high-strength low-alloy aluminium alloy, containing no more than 0.8% Ni and intended to obtain as shaped castings and deformed semi-finished products and high manufacturability while processing pressure (in particular, upon receipt of rolled sheets cold rolled) and casting (in particular, in a single form).

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

Zinc5,5-6,5
Magnesium1.7 to 2.3
Nickel0,4-0,7
Iron0,3-0,7
Zirconia0,02-0,25
Copper0,05-0,3
AluminumRest

and the solidus temperature is not less than 570°C, the temperature of solvus not more than 410°C., and the hardness is not less than 150 HV.

The material may be in the form of castings (in particular, by casting in a single form)with the following properties tensile: tensile strength (σin) not m is it 450 MPa, the yield stress (σof 0.2) not less than 400 MPa, elongation (δ) - not less than 4%.

Furthermore, the material may be in the form of deformed semi-finished products (in particular, rolled sheets)with the following properties tensile: tensile strength (σin) not less than 500 MPa, the yield stress (σof 0.2) not less than 450 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 and processability. The stated limitation on the solidus temperature allows spheroidizing annealing at a sufficiently high temperature, generating a relatively globular particles of phases of Al9FeNi, which has a positive effect on plasticity. The stated temperature limits of solvus allows you to dissolve the zinc, magnesium and copper in the aluminum solid solution at relatively low temperatures, which facilitates the final (or re) heat treatment. This has a positive effect on the cost of treatment.

EXAMPLE 1.

Were prepared ingots 6 alloys whose composition is shown in table 1. The alloys were prepared in an electric resistance furnace in gravitometric crucible of salaminia brand AE (99,5%), 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 solidus temperatures (TSand solvus (TSS) was performed using the software Thermo-Calc database TTAL5). Under TSSwas taken the temperature of complete dissolution of zinc, magnesium and copper in the aluminum solid solution during heating. Ingots 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 on universal hardness tester Wilson Wolpert 930. Calculated and experimental values are given in table 1.

From table 1 it is seen that only the claimed alloy (compounds 2-4) provides the required values of TS, TSSand HV. While the claimed alloy meets the required limit of Nickel concentrations (less than 0.8%). In alloy 1 hardness is much below the required level. In grades 5 and 6 the values of TSbelow the required level, and the values of TSSon the contrary, above.

Table 1
The compositions of the experimental alloys and their characteristics
Concentration in the alloy, wt.%TS, °C TSS, °CHV
ZnMgNiFeZrCuAl
14,01,50,20,20,010,02leave61233595
25,52,30,70,70,020,05leave586394165
36,02,00,50,50,150,2leave586394158
4 6,51,70,40,30,250,3leave586392155
58,03,01,01,00,30,5leave525461210
616,72,82,00,40,150,2leave554436190
1the average composition of the alloy-prototype

EXAMPLE 2.

Alloys 3 and 5 (table 1) were obtained in the form of shaped castings by casting in a single form, which was produced by the method of rapid prototyping printer Z-cast. A separate part of the form was collected and sealed (figa). Castings of alloy 3 (figb) did not contain defects, and their microstr the established levels was characterized by relatively compact inclusions phase Al 9FeNi. Castings of alloy 5 was cracked, so the mechanical properties are not defined. After the heat treatment provides hardness specified in table 1, were determined by the mechanical properties of alloy 3 on cylindrical specimens cut from castings, GOST 1497-84. From table 2 it is seen that the alloy of the claimed composition in the castings obtained by casting in a single form, has the desired mechanical properties.

Table 2
The mechanical properties of the claimed alloy1in castings
σin, MPaσof 0.2, MPaδ,%
4604205,5
1part 3 (see table 1)

EXAMPLE 3.

Alloy 3, 5 and 6 (table 1) were obtained cold-rolled sheets according to the technology, which included the following basic operations:

- getting a flat ingot thickness of 20 mm;

- two-stage homogenization annealing the ingot;

hot rolling the homogenized ingot to a thickness of 2 mm;

intermediate annealing of hot-rolled sheet;

- cold rolling to a thickness of 0.45 and 0.17 mm (half the value of rolled sheets);

- hardening heat treatment of cold-rolled sheets (heating for hardening, quenching in cold water and aging).

In grades 5 and 6 in the cold rolling process formed cracks, so their mechanical properties were not determined. In sheet car alloy 3 cracks and other defects were not detected (figure 2).

After the heat treatment of cold-rolled sheet of alloy 3 was determined mechanical properties on flat samples cut from the sheets, according to GOST 1497-84.

From table 3 it is seen that the alloy of the claimed composition in the form of rolled sheets has the required mechanical properties.

Table 3
The mechanical properties of the claimed alloy1in sheets
Sheet thickness, mmσin, MPaσof 0.2, MPaδ,%
0,455204607,0
0,175604805,5
1part 3 (see table 1)

1. Alloy based on aluminium is Oia, containing, zinc, magnesium, Nickel, iron, zirconium and copper, characterized in that it contains components in the following amounts, wt.%:

Zinc5,5-6,5
Magnesium1.7 to 2.3
Nickel0,4-0,7
Iron0,3-0,7
Zirconia0,02-0,25
Copper0,05-0,3
AluminumThe rest,

moreover, the alloy has a solidus temperature of not less than 570°C, the temperature of solvus not more than 410°C and the hardness is not less than 150 HV.

2. The alloy according to claim 1, characterized in that it is made in the form of castings and has after heat treatment regime T6 tensile strength (σin) not less than 450 MPa, the yield stress (σof 0.2) - not less than 400 MPa, elongation (δ) - not less than 4%.

3. The alloy according to claim 1, characterized in that it is made in the form of rolled sheets and has after quenching and aging tensile strength (σin) not less than 500 MPa, the yield stress (σof 0.2) not less than 450 MPa, elongation (δ) of not less than 5%.



 

Same patents:

FIELD: metallurgy.

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EFFECT: higher efficiency and stability of electrochemical characteristics.

2 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: invention may be used for making critical parts operated at high loads at 100-150°C, e.g, those of aircraft, cars and trucks, etc. Aluminium-based alloy comprises 7-12% of Zn, 2-5% of Ca, 2.2-3.8% of Mg, 0.02-0.25% of Zr. Note here that its hardness makes at least 150 HV, σB>450 MPa. σ0.2>400 MPa.

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4 tbl, 3 ex, 2 dwg

FIELD: metallurgy.

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12 cl, 8 dwg, 6 tbl, 2 ex

FIELD: metallurgy.

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2 cl, 2 tbl, 1 ex

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32 cl, 10 dwg, 10 tbl, 4 ex

FIELD: weapons and ammunition.

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FIELD: metallurgy.

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30 cl, 8 tbl, 3 ex

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2 tbl

Aluminum-base alloy // 2280092

FIELD: metallurgy.

SUBSTANCE: invention relates to aluminum-base alloys used for making deformed semifinished products used in industry and building. Proposed alloy comprises the following components, wt.-%: zinc, 4.5-5.6; magnesium, 1.6-2.1; manganese, 0.2-0.8; scandium, 0.03-0.09; zirconium, 0.05-0.12; copper, 0.1-0.3; titanium, 0.01-0.07; molybdenum, 0.01-0.07; cerium, 0.001-0.01, and aluminum, the balance, wherein the ratio content of zinc to magnesium = 2.6-2.9. Invention provides the development of alloy providing enhancing corrosion resistance of articles.

EFFECT: improved and valuable properties of alloy.

2 tbl, 1 ex

FIELD: metallurgy of aluminum alloys; manufacture of wrought semi-finished products for transport engineering and other industries.

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EFFECT: enhanced corrosion resistance and technological ductility of semi-finished items at plastic metal working.

2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to aluminum-base material. Proposed material comprises the following components, wt.-%: zinc, 6-8; magnesium, 2.5-3.5; nickel, 0.6-1.4; iron, 0.4-1.0; silicon, 0.02-0.2; zirconium, 0.1-0.3; scandium, 0.05-0.2, and aluminum, the balance wherein the temperature of equilibrium solidus of material is 540°C, not less, the hardness value of material is 200 HV, not less. Invention provides the development of the novel high-strength material designated for both producing fashioned ingots and deformed semifinished product possessing high mechanical properties. Invention can be used in making articles working under effect of high loading, such as car articles and sport inventory articles.

EFFECT: improved and valuable properties of material.

4 cl, 2 dwg, 4 tbl, 3 ex

FIELD: nonferrous metallurgy.

SUBSTANCE: invention relates to ultrastrong economically alloyed aluminum-based alloys belonging to system Al-Zn-Mg-Cu. Alloy and article made therefrom are, in particular, composed of, %: zinc 3.5-4.85, copper 0.3-1.0, magnesium 1.2-2.2, manganese 0.15-0.6, chromium 0.01-0.3, iron 0.01-0.15, silicon 0.01-0.12, scandium 0.05-0.4, at least one element from group: zirconium 0.05-0.15, cerium 0.005-0.25, and aluminum - the rest.

EFFECT: increased characteristics of corrosion resistance, bondability with all welding techniques, and lowered fatigue crack growth rate.

2 cl, 2 tbl

FIELD: metallurgy.

SUBSTANCE: invention proposes alloy containing the following components, wt.-%: zinc, 5.4-6.2; magnesium, 2.51-3.0; manganese, 0.1-0.3; chrome, 0.12-0.25; titanium, 0.03-0.10; zirconium, 0.07-0.12; beryllium, 0.0002-0.005; sodium, 0.0001-0.0008; copper, 0.2, not above; iron, 0.3, not above; silicon, 0.2, not above, and aluminum, the balance. Alloy provides enhancing uniformity of armor structure and its welded seams, stable armor resistance of extended armor welded seams independently on disposition of units to bed welded, elimination of splits from armor rear site in case its resistance to a missile impact, elimination possibility for reducing tenacity of armor during its exploitation including using under conditions of combination with dynamic protection of armored-body and armor-carrying mechanized objects. Invention can be used in producing armor for individual protection and for protection of mechanized armor-carrying objects against effecting agents.

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.

FIELD: metallurgy.

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.

FIELD: metallurgy.

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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