Aluminum-based 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

 

The invention relates to the field of metallurgy, namely to obtain alloys based on aluminium, designed for the manufacture of forgings, in particular forgings drive road wheels.

Known alloys of the system Al-Zn-Mg-Cu, for example B95, VC, which are used for the production of structural forgings. However, the alloys have low adaptability in the drop-forging, which does not allow to obtain a complex shape forming.

Adopted as a prototype known deformation alloy 7075, containing the following components, wt%:

Copper1.2÷2.0
Magnesium2.1÷2.9
Manganese<0.3
Iron<0.50
Silicon<0.40
Zinc5.1÷6.1
Titanium<0.20
Chrome0.18÷0.28
Aluminumthe rest (ASTM B221M).

The disadvantages of this alloy include the following:

the alloy has poor ductility in the as-cast condition and, of course, the tendency to form cracks during casting;

the alloy contains a large amount of alloying elements and impurities (>10%), which leads to the formation of coarse the primary insoluble intermetallic compounds, and, accordingly, reduces fatigue characteristics of the products.

The technical task of the present invention is to provide an alloy with the best combination of strength and plasticity, which guarantee the required level of operational characteristics drive the car wheels, reducing their weight in combination with high processability when the drop-forging, especially products of complicated shape.

This technical result is achieved in that the base alloy of aluminum containing copper, magnesium, manganese, iron, silicon, zinc, titanium, chromium, according to the invention further comprises zirconium, boron and hydrogen in the following ratio, wt%:

Copper0.8÷2.2
Magnesium1.2÷2.6
Manganese0.2÷0.6
Iron≤0.25
Silicon≤0.20
Zinc5.0÷6.8
Titanium≤0.1
Chrome0.08÷0.17
Zirconia0.01÷0.12
Bor0.0008÷0.005
Hydrogen(from 0.3 to 4.1)10-5
Aluminumthe rest,

when this is: Ti+Zr+Cr≤ 0.25%, Cu+Mg+Zn≤8.6%.

The addition of boron and zirconium provides improved processability of the alloy during deformation, especially when the sediment and the drop-forging due to the formation of bullion fine-grained, homogeneous structure. The presence in the alloy is less than 0.0008% boron leads to the formation of bullion rough, coarse-grained structure and, consequently, decrease the processability during deformation.

When the content of the bullion more than 0.005% of boron are formed clusters of intermetallics TiB2reducing fatigue and plastic characteristics of semi-finished products.

The presence in the alloy of the hydrogen promotes the formation of hydrides of titanium, which, as modifiers, advanced pulverized structure of the ingot.

When the content in the ingot of zirconium, less than 0.01% in the semi-formed heterogeneous coarse recrystallized structure, increasing the anisotropy of the properties of the cross-section semi-finished products.

When the content of zirconium more than 0.12% receive primary intermetallic compounds of Al3(Zr,Ti)reducing the manufacturability of ingots during deformation and contributing to the formation of internal defects.

The presence along with the strongest EnterCriticalSection zirconium in the proposed alloy in small amounts of titanium and chromium, when the total content of (Zr+Ti+Cr), not exceeding 0.25%, promotes the formation is to Finance in the blanking neric-kristallizovannyj structure with a minimum number of eutectic constituents and the lack of primary intermetallic compounds of transition elements with aluminum.

Reducing legirovannoi alloy main components of Cu, Mg and Ti (less than 8,6%) reduces the probability of formation gross excess phases and their negative impact on the manufacturability during deformation and plastic properties of forgings.

An example embodiment of the invention.

In industrial conditions of the foundry shop of the enterprise were experienced cast ingots of aluminum alloy with the chemical composition given in table 1.

Table 1
No. alloyCuMgMnFeSiZnTiCrZrInN

10-5
12.22.60.60.250.25.00.10.080.010.00084,1
21.61.20.40.150.15.60.060.120.080.0012,7
30.81.90.20.200.156.8-0.170.12.005 0,3
41.62.40.250.40.35.60.150.25--

1-3 proposed alloy, 4 - known alloy.

Of ingots after homogenization at temperatures 455-470°C for 20 hours and then turning were made stamping drive road wheels. Stamping was subjected to heat treatment by mode:

- quenching from temperatures 465-475°after exposure 90 min in water with a temperature of 20-25°C

- aging regime T2 (step I 110-120°C, holding for 5 hours, level II 165-175°C, holding for 15 hours).

Technological plasticity, are shown in table 2, was determined on samples taken from the homogenised ingot.

Table 2.
No. alloysStretchingSediment,

%
δ,%Ψ,%
182,390,478
285,896,484
381,4for 91.376
472,483,2 62

The complex of mechanical properties declared and known alloy is presented in table 3.

Table 3
No. alloysσinσof 0.2δMCU, the number of

cycles to failure
RJC,

score
MPa%
151844211,410903
251043212,611004
352545610,810503
4476392810004

As can be seen from the obtained and presented results the proposed composition of the alloy can improve the technological plasticity 1.2-1.35 times, plasticity 1.35-1.6 times with increasing strength of more than 1.1 times, the preservation of the corrosion properties and the improvement of fatigue resistance.

The use of the alloy for production of forgings including drives automotive wheels will improve the manufacturability of their sex is to be placed, as well as the reliability and performance of the product in use.

We offer alloy in comparison with the known has the best combination of strength and ductility, which guarantee the required level of operational characteristics drive the car wheels, reducing their weight in combination with high processability when the drop-forging, especially products of complicated shape.

1. The base alloy of aluminum containing copper, magnesium, manganese, iron, silicon, zinc, titanium, chromium, characterized in that it further contains zirconium, boron and hydrogen in the following ratio, wt.%:

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

Titan ≤0.1

Chrome 0.08÷0.17

Zirconium, 0.01÷0.12

Boron 0.0008÷0.005

Hydrogen (from 0.3 to 4.1)·10-5

Aluminum else

2. Alloy based on aluminum according to claim 1, characterized in that the sum of

Ti+Zr+Cr≤0,25%.

3. Alloy based on aluminum according to claim 1, characterized in that the amount of Cu+Mg+Zn≤8,6%.



 

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FIELD: metallurgy.

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FIELD: nonferrous metallurgy.

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2 cl, 2 tbl

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4 cl, 2 dwg, 4 tbl, 3 ex

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Aluminum-base alloy // 2280092

FIELD: metallurgy.

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2 tbl, 1 ex

FIELD: metallurgy.

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EFFECT: enhanced corrosion protection.

2 tbl

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EFFECT: enhanced corrosion protection.

2 tbl

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FIELD: metallurgy.

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2 tbl, 1 ex

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2 tbl, 1 ex

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2 cl, 2 tbl

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1 tbl

FIELD: metallurgy.

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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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