Alloy based on aluminium and products made from it

 

(57) Abstract:

The invention relates to alloys based on aluminium system Al-Zn-Mg-Cu, intended for use as structural materials in the manufacture of casings and elements of the power set, such as stringers, power beams, etc. used in aerospace engineering, operating in all, including marine conditions, and also used in marine, land transport and other branches of engineering. Proposed alloy containing the following components, wt.%: zinc of 7.6 to 8.6, magnesium 1,6-2,3, copper 1,4-1,95, zirconium 0,08-0,18, scandium from 0.01 to 0.25, the silver 0,01-0,5, manganese 0,01-0,1, titanium from 0.005 to 0.07, the iron of 0.02 to 0.15, silicon 0,01-0,10, beryllium 0,0001-0,005, hydrogen 0,8·10-5-2,7·10-5, antimony 0,00002-0,0005, aluminum else, while the total content of zirconium, scandium, titanium and magnesium does not exceed 0,45%. The technical result of this invention is to provide alloy and articles made therefrom, having along with high structural strength, high corrosion resistance and reliability. 2 S. and 1 C.p. f-crystals, 2 PL.

The invention relates to alloys based on aluminium systems A1-Zn-Mg-Cu, intended for use in the in, power beams and others) and aerospace engineering, operating in the marine environment, and also used in transport machine-building, shipbuilding and other branches of engineering.

Known for high alloy system Al-Zn-Mg-Cu-1973, having the following chemical composition, wt.%:

Zn 5,5-6,5

Mg 2,0-2,6

Si 1,4-2,0

Zr 0,08-0,16

Ti 0,02-0,07

Mn 0,10

Cr 0,05

Fe 0,15

Si 0,10

Al The Rest

(“New non-ferrous alloys M., MDTP, 1990, S. 33)

The alloy is suitable for parts of the power set of glider aircraft.

Known alloys of the 7000 series, for example:

the alloy having the following chemical composition, wt.%:

Zn 5,7-6,7

Mg 1,9-2,6

C 2,0-2,6

Zr 0,08-0,15

Ti 0,06

Mn 0,10

Cr 0,04

Fe 0,15

Si 0,12

Al The Rest

(Aluminum Standards and Data, Al Assoc, Washington)

or alloy having the following chemical composition, wt.%:

Zn 5,9-6,9

Mg 2,0-2,7

C 1,9-2,5

Zr 0,08-0,15

Ti 0,06

Cr 0,04

Fe 0,15

Si 0,12

Al The Rest

(U.S. patent No. 4305763)

or splawn CLASS="ptx2">Ni 0,05-1,2

REM 0,05-1,0

Fe 0,2-0,45

Si 0,05-0,15

one element from the group:

Zr 0,05-0,25

Ti 0,001-0,1

0,001-0,01

Mn Of 0.05 To 0.60

Cr 0,03-0,25

Va 0,03-0,15

and/or Pb, Bi, Sn 0,05 -2,5

Al The Rest

(Japan Patent No. 2107739).

High-alloyed alloys of the system Al-Zn-Mg-Cu, as alloys of type 1973, and 7000 series are designed as a structural material of the main power components of the airframe of the aircraft skin, the details of the power set, stringers and other

All these alloys, providing a relatively high level of structural strength, have inadequate corrosion properties, which makes them effectively to use in products used under all climatic conditions, including the sea.

The similar chemical composition and purpose to the present invention is an alloy based on aluminum the following chemical composition, wt.%:

Zn 5,0-8,0

Mg 1,2-4,0

Si Of 1.5-4.0

Ag 0,03-1,0

REM (Sc) 0,03-5,0

Fe 0,01-1,0

Ti Of 0.005 To 0.2

at least one element selected from the elements:

Mn 0,01-1,5

Cr 0,01-0,6

Zr 0,01-0,with high performance structural strength, is not a high resistance to corrosion: General, dissecting, intergranular corrosion, which does not allow to use it effectively in the products used in marine applications.

The closest to the invention is a fusion product containing the following components, wt.%: zinc of 7.6 to 8.6, magnesium 1,6-2,3, copper 1,4-1,95, zirconium 0,08-0,2, manganese 0.01 to 0.1, the iron of 0.02 to 0.15, silicon of 0.01-0.1, chromium 0.01 to 0.05, Nickel is 0.0001-0.03, beryllium 0,0001-0,005, bismuth 0,00005-0,0005, hydrogen 0,8·10-5-2,7·10-5at least one element from the group: titanium from 0.005 to 0.06, boron 0.001 to 0.01, aluminum - rest (EN 2184166 C2, IPC 7 With 22 21/10, 27.06.2002, abstract).

The technical purpose of this invention is to provide alloy and products on its basis, along with high structural strength, high resistance to intergranular corrosion, dissecting corrosion, General corrosion and stress corrosion, providing operational reliability under all climatic and especially in the marine environment.

To achieve the technical objectives of the proposed high-strength alloy based on aluminum containing Zn, Mg, Cu, Zr, Sc, Ag, Mn, Ti, Fe, characterized in that it further Sadeh">Si 1,4-1,95

Zr 0,08-0,18

Ag 0,01-0,5

Sc 0,01-0,25

Si 0,01-0,10

Be 0,0001 -0,005

H20,8·10-5-2,7·10-5

Sb 0,00002-0,0005

Mn 0,01-0,1

Fe 0,02-0,15

Ti From 0.005 To 0.07

Al The Rest

and products made from it, with the amount of Zr + Sc + Ti + Mn must be of 0.45%.

The technical result, namely improving the corrosion resistance and structural strength, providing increased operational reliability is achieved by introducing into the alloy proposed chemical composition of antimony, beryllium, hydrogen and silicon.

The introduction of hydrogen in the alloy leads to the formation of magnesium hydride, which, being the centers of crystallization, spoopstut modification of the melt, which further grinds Serenoa structure and provides increased structural strength.

The presence of beryllium reduces oxidation and oxide prisoner in the alloy, thereby increasing operational reliability.

A small additive antimony leads to the formation of the oxide film, which provides excellent corrosion resistance in seawater and the atmosphere. When the total soderjit also reduce graciloplasty in the casting process and the formation of dispersed phases type SbAl, which, as an additional crystallization centers, increase the modifying effect, which leads to additional grinding cast structure and accordingly to increase structural strength and reliability in the operation of marine conditions and high humidity conditions. In addition, the presence of antimony in the claimed number of sharply reduces the loss of mechanical properties by reducing the rate of General corrosion, which allows the use of products made of this alloy for a long time at all, including the marine environment.

An example implementation

In the laboratory semi-continuous method were cast ingots 0110 mm from the proposed and known alloys. The chemical composition of proposed and known alloys are given in table.1., where the example 1-3-proposed composition and example 4 - the composition of the alloy of the prototype.

After homogenization mode 460°C - 24 hours ingots were extruded in strip size 18×75 mm From strips cut out of the workpiece under the samples, which were tempered with temperature 470°C in water to room temperature. Aging of the samples of the inventive alloy and the alloy of the prototype was performed according to the three-mode T12.

To evaluate the corrosion properties were defined:

- the tendency to stress corrosion cracking (CR) in accordance with GOST 9019074, score - level critical voltage at which breakdown occurs samples over 30 days; samples were cut in the transverse direction;

- susceptibility to intergranular corrosion (IGC) in accordance with GOST 9021-74, the score on the depth of corrosion in metallographic study of microsections;

the propensity for dissecting corrosion (SSC) in accordance with GOST 9904-82, the score on 10-point scale;

General corrosion resistance in accordance with GOST 9913-90 assessment loss of mechanical properties.

The results of the tests are given in table.2, showed that the proposed alloy based on aluminum, having high characteristics of structural strength, yield strength and relative elongation, provides in comparison with the known alloy improving critical voltage level kr1.5-1.7 times, more than twice decreases the depth of intergranular corrosion, decreases the score dissecting corrosion up to 4 and 2 3.5 times are reduced loss of mechanical properties after testing General corrosion.

th strength allows you to use it as a structural material in the critical parts of the assignment (plating, power set, stringers and other) aircraft, including naval aviation, the apparatus type “Amphibian” and courts for various purposes, operated in the sea and all conditions, providing high reliability and high yield.

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

Zinc To 7.6 And 8.6

Magnesium 1,6-2,3

Copper 1,4-1,95

Zirconium 0,08-0,18

Silver 0,01-0,5

Scandium 0,01-0,25

Silicon 0,01-0,10

Beryllium Is 0.0001-0,005

Hydrogen 0,8×10-5-2,7×10-5

Antimony 0,00002-0,0005

Manganese 0,01-0,1

Iron 0,02-0,15

Titanium Is From 0.005 To 0.07

Aluminum Else

2. Alloy based on aluminium under item 1, characterized in that the total content of Zr+Sc+Ti+Mn£0,45%.

3. The product from an alloy based on aluminum, characterized in that it is made of alloy under item 1 or 2.



 

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2 tbl

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1 tbl

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