Aluminum-based alloy for manufacturing structural foil, method of preparing ingots from aluminum-based alloy for manufacturing structural foil, and a method for manufacturing structural foil from aluminum-based alloy

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

 

The invention relates to the field of metallurgy of non-ferrous metals and can be used in metallurgical, engineering and aerospace industries, in particular for the production of honeycomb structures, which require relatively high stiffness structures, combined with their ease.

Known alloy based on aluminium for the production of structural foil containing the following components, wt.%: magnesium 1,8-2,6, manganese 0,2-0,6, zirconium, 0.05 to 0.15, beryllium 0,002-0,005, iron is not more than 0.4, the silicon is not more than 0.4, titanium is not more than 0.4, scandium of 0.1 to 0.19, hydrogen 0,0179774-0,035948, copper not more than 0.1, zinc not more than 0.2, aluminum - rest (EN 2081933, SS 21/06, publ. 20.06.1997).

This solution is taken as a prototype for the claimed alloy based on aluminium for the manufacture of constructional foil.

From the same source is known a method of producing ingots of an alloy based on aluminium for the manufacture of constructional foil, which can be taken as the closest analogue to the claimed method of producing ingots of an alloy based on aluminium for the manufacture of constructional foil, including the casting of ingots of an alloy based on aluminum containing magnesium, manganese, zirconium, beryllium, iron, silicon and titanium.

From the same source, the method of manufacturing a structural foil alloy asnowolnienie, including the casting of ingots, homogenization, hot and cold rolling of an ingot of an alloy based on aluminum containing magnesium, manganese, zirconium, beryllium, iron, silicon and titanium.

This known method of EN 2081933 adopted as a prototype for the third stated object, a method of manufacturing a structural foil of an alloy based on aluminum.

The disadvantages of the known solutions used for the manufacture of a foil of an alloy based on aluminum, is that the sheets have insufficient technological plasticity when cold deformation, so products made from this alloy, not enough technological and require considerable effort in obtaining, for example, stringers.

Foil of these alloys are widely used in the aviation and shipbuilding industries and is based on the following technologies: casting of ingots semi-continuous casting, rolling of the foil.

The main disadvantage of this alloy is low workability of this alloy by rolling, which is associated with instability of the solid solution, and also with the presence of large intermetallic phases, which in commensurability with the thickness of the lead to the formation of dircetory. In addition, the tensile strength of the foil from the data of the alloys does not exceed 40 kg/mm, which cannot satisfy the requirements, requirements for new technical products.

Another disadvantage of the known alloy is high in iron content, the impossibility of re-use of waste for other purposes: indeed, the fabrication of ultra-thin tape is a very complex operation, requiring a large number of raw materials and accompanied by a large amount of waste. One way to overcome this limitation is the use for the manufacture of blanks installation for continuous casting, such as continuous casting between rolls, making it easier to use scraps and waste of continuous casting as raw material for loading into the furnace installation. This advantage is inextricably linked with other advantages of continuous casting, in particular with high investment return.

As a disadvantage of this method is low manufacturability during rolling, which is associated with instability of the solid solution, and also with the presence of large intermetallic phases, which in commensurability with the thickness of the lead to the formation of dircetory. In addition, the tensile strength of the foil in these alloys is not sufficient for the required purposes for use, which can not meet the modern requirements of the new technical products, especially if these products aviation or kosmicheskoy industry.

Therefore, this invention is directed to the solution of the technical problem to create such a production method structural foil of an alloy based on aluminum, which would provide increased strength at room and elevated temperatures, and improved manufacturability during rolling.

Achievable technical result is to improve manufacturability by rolling the foil and improve the mechanical properties of the foil at room and elevated temperatures.

This technical result for the first object is achieved in that the alloy based on aluminium for the manufacture of constructional foil containing magnesium, manganese, zirconium, beryllium, iron, silicon and titanium, further comprises cobalt and boron, in the following ratio of ingredients, wt.%:

magnesium8-10
manganese0,1-0,15
Zirconiaof 0.15-0.2
cobaltof 0.05-0.2
Bor0,005-0,007
beryllium0,001-0,02
ironof 0.15-0.2
siliconof 0.15-0.2
titanium0,1-0,2
aluminumrest

This technical result for the second object is achieved in that in the method of producing ingots of an alloy based on aluminium for the manufacture of constructional foil, including the casting of ingots of an alloy based on aluminum containing magnesium, manganese, zirconium, beryllium, iron, silicon and titanium, the alloy further comprises cobalt and boron in the following ratio of ingredients, wt.%:

magnesium8-10
manganese0,1-0,15
Zirconiaof 0.15-0.2
cobaltof 0.05-0.2
Bor0,005-0,007
beryllium0,001-0,02
ironof 0.15-0.2
siliconof 0.15-0.2
titanium0,1-0,2
aluminumthe rest,

the casting of ingots carry out semi-continuous casting in a rotating mold at a high volume cooling 4-20 deg/S.

This technical result for the third object is achieved in that in the method of manufacturing a structural foil of an alloy based on aluminum, including the casting of ingots, homogenization, hot and cold rolling of an ingot of an alloy based on aluminum, containing the magician is s, manganese, zirconium, beryllium, iron, silicon and titanium, the alloy further comprises cobalt and boron in the following ratio of ingredients, wt.%:

magnesium8-10
manganese0,1-0,15
Zirconiaof 0.15-0.2
cobaltof 0.05-0.2
Bor0,005-0,007
beryllium0,001-0,02
ironof 0.15-0.2
siliconof 0.15-0.2
titanium0,1-0,2
aluminumthe rest,

the casting of ingots carry out semi-continuous casting in a rotating mold at a high volume cooling 4-20 deg/s, followed by homogenization at a temperature 480°C for up to 10 hours, hot rolling at a temperature of 340-350°With up to a thickness of 6 mm, annealed at a temperature of 360-390°C for up to 2 h, the cold rolling to a thickness of 3 mm, followed by annealing at a temperature of 360°C for 40 min in air atmosphere, repeated cold rolling to 800 μm, followed by annealing at a temperature of 310-330°C for 30 min, and final cold rolling to 100 microns.

These characteristics are essential and interrelated with the formation of stable the willow essential features, sufficient to obtain the desired technical result.

In respect of the declared objects of the task can be achieved because:

1) in the base alloy of aluminum containing magnesium, manganese, titanium, silicon, iron, introduced cobalt, zirconium, beryllium, and boron in the following ratio of ingredients, wt.%:

magnesium8-10
manganese0,1-0,15
Zirconiaof 0.15-0.2
cobaltof 0.05-0.2
Bor0,005-0,007
beryllium0,001-0,02
ironof 0.15-0.2
siliconof 0.15-0.2
titanium0,1-0,2
aluminumrest

2) the casting of ingots of the proposed alloy should be done in rotating the mold at a high volume cooling with speed 4-20 deg/S.

The increase in magnesium content will simultaneously increase the mechanical properties of the lower specific weight of the alloy,

Reducing the manganese content will reduce the size of the intermetallic phases that will improve the quality of the foil due to the exclusion of dircetory and improve manufacturability PR is rolling.

The addition of cobalt reduces the lattice parameter and thereby improve the workability during rolling.

The addition of zirconium will allow together with beryllium to improve corrosion resistance and together with cobalt - resistance.

Boron, as surface-active material, will contribute to the modification of excess phases and therefore a more complete incorporation of magnesium in solid solution that will help increase strength and reduce the number of In-faey that will have a positive impact on corrosion resistance.

For experimental verification of the present invention was molded 6 compositions of the alloy (table 1) to produce ingots.

Casting ingots was carried out in a rotating mold in the velocity range 4-20 deg/s Then after homogenization 480° - 10 hours were rolling pattern:

1) hot rolling 340-350°With up to a thickness of 6 mm;

2) annealing at 360-390°2 h;

3) cold rolling to a thickness of 3 mm;

4) annealing 360°40 min - air;

5) cold rolling up to 800 microns;

6) annealing at 310-330°30 min;

7) cold rolling to 100 microns.

This method was tested, manufactured foil with a thickness of 100 μm made of an alloy based on aluminum, of the following composition, wt.%:

magnesium 8-10
manganese0,1-0,15
Zirconiaof 0.15-0.2
cobaltof 0.05-0.2
Bor0,005-0,007
beryllium0,001-0,02
ironof 0.15-0.2
siliconof 0.15-0.2
titanium0,1-0,2
aluminumrest

The results of the tests are presented in tables 1 and 2 (table 2 presents the results of testing the mechanical properties of the foil thickness 100 μm).

Table 1
No. chem. compositionMagnesiumManganeseCobaltZirconiaBorBerylliumTitaniumIronSilicon
1120,20,10,110,0040,00090,0750,150,15
2100,20,10,15 0,0050,0010,10,150,15
390,150,050,120,070,0150,150,150,15
480,150,120,20,010,020,20,150,15
570,10,20,30,080,030,30,150,15
6Known.

5,5
0,3----0,150,150,15
Table 2
No. chem. compositionTensile strength, MPaYield strength, MPaElongation, %
20°300°20°300°20°300°
14801603301206,018
26263505562924,06
35943385142834,56,2
4573324517281the 4.76,4
55503164822655,17,0
6 Known.

402
1652811242,016

Table 3 presents the test results of the proposed method and alloy technology in the car.

Table 3
No. chem. compositionThe cooling rate, deg/sThe maximum permissible degree of deformation, %
11Crack during hot rolling
4
7
10
12
21Crack
449
753
1047
12Cracked his
31Cracked his
453
752
1052
12Crack
41Crack
452
752
1 52
12Crack
51Crack
452
752
1052
12Crack

From tables 1 and 2 data shows that the proposed method for the manufacture of constructional foil can significantly improve manufacturability by rolling the foil and increase the level of mechanical properties on the foil at room and elevated temperatures.

1. Alloy based on aluminium for the manufacture of constructional foil containing magnesium, manganese, zirconium, beryllium, iron, silicon and titanium, characterized in that it further contains cobalt and boron in the following ratio of ingredients, wt.%:

Magnesium8-10
Manganese0,1-0,15
Zirconiaof 0.15-0.2
Cobaltof 0.05-0.2
Bor0,005-0,007
Beryllium0,001-0,02
Ironof 0.15-0.2
Siliconof 0.15-0.2
Titanium0,1-0,2
Aluminum is Rest

2. The method of producing ingots of an alloy based on aluminium for the manufacture of constructional foil, including the casting of ingots of an alloy based on aluminum containing magnesium, manganese, zirconium, beryllium, iron, silicon and titanium, wherein the alloy additionally contains cobalt and boron in the following ratio of ingredients, wt.%:

Magnesium8-10
Manganese0,1-0,15
Zirconiaof 0.15-0.2
Cobaltof 0.05-0.2
Bor0,005-0,007
Beryllium0,001-0,02
Ironof 0.15-0.2
Siliconof 0.15-0.2
Titanium0,1-0,2
AluminumRest

and the casting of ingots carry out semi-continuous casting in a rotating mold at a high volume cooling 4-20 deg/S.

3. A method of manufacturing a structural foil of an alloy based on aluminum, including the casting of ingots, homogenization, hot and cold rolling of an ingot of an alloy based on aluminum containing magnesium, manganese, zirconium, beryllium, iron, silicon and titanium, characterized in that the alloy updat the further contains cobalt and boron in the following ratio of ingredients, wt.%:

Magnesium8-10
Manganese0,1-0,15
Zirconiaof 0.15-0.2
Cobaltof 0.05-0.2
Bor0,005-0,007
Beryllium0,001-0,02
Ironof 0.15-0.2
Siliconof 0.15-0.2
Titanium0,1-0,2
AluminumRest

and the casting of ingots carry out semi-continuous casting in a rotating mold at a high volume cooling 4-20 deg/s, followed by homogenization at a temperature 480°C for up to 10 hours, hot rolling at a temperature of 340-350°With up to a thickness of 6 mm, annealed at 360-390°C for up to 2 h, the cold rolling to a thickness of 3 mm, followed by annealing at a temperature of 360°C for 40 min in air atmosphere, repeated cold rolling to 800 μm, followed by annealing at a temperature of 310-330°C for 30 min, and final cold rolling to 100 microns.



 

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