Aluminum-based alloy and an article made therefrom

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

 

The invention relates to the field of non-ferrous metallurgy, namely srednepozny, low-alloy alloys based on aluminium system Al-Zn-Mg-Cu. Semi-finished products of these alloys (sheets, profiles, stamping, forging, etc. are used as structural materials in the manufacture of the fuselage skin, the elements of the power set of glider seaplanes, helicopters and carrier-based aircraft operated under all climatic conditions, and also used in transport machine-building, shipbuilding, building structures and other branches of engineering.

Known alloy based on aluminum, having the following chemical composition (wt.%):

Zn=3,2-2,8

Mg=2,2-2,8

Cr=0.1 to 0.3

Zr=0.1 to 0.3

In=0,01-0,03

Be=0,01-0,05

Ti=0.1 to 0.3

Al=the rest (ed. St. USSR №1427857)

The alloy is designed for molded parts and products made from it. The disadvantage of the alloy is reduced technological plasticity, reduced corrosion resistance and strength characteristics, which does not allow to use it in the details of the power set and covers aircraft of the new generation.

Known alloys based on aluminium 7000 series, for example:

1. The alloy having the following chemical composition (wt.%):

Zn=5,0-8,0

Mg=2,0-3,5

Cu=0,5-2,5

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=0,01-0,1

In=0,001-0,01

Mn=0.05 to 0.6

Cr=0,03-0,25

V=0,03-0,15

or Pb, Bi, Sn=0,05-2,5

Al=the rest (Japan patent No. 2107739)

2. Alloy based on aluminum the following chemical composition (wt.%):

Zn=3,5-5,0

Mg=2,2-3,5

Mn=0.5 to 1.2

Zr=0.1 to 0.3

Fe≤0,1

Si≤0,1

Cr≤0,1

Ti≤0,1

Al=the rest (the United Kingdom patent No. 2246578)

These high-alloyed alloys of the system Al-Zn-Mg are used as structural materials of the main power components of the airframe - plating, parts of the power set of stringers and other Alloys, providing a relatively high level of structural strength, poorly welded and have insufficient corrosion resistance that you can't effectively use them in products that are operated under all climatic conditions.

The closest in chemical composition to the present invention is an alloy based on aluminum the following chemical composition (wt.%):

Zn=5,0-9,0

Mg=0,3-3,0

Cu=0,3-1,3

Zr=0,05-0,3

Fe=0,05-0,3

Si=0,01-0,2

at least one element from the group:

Ni=0,01-0,2

With=0,01-0,2

at least one element from the group:

Be=0,0001-0,05

Mo=0,001-0,1

Mn=0,01-0,1

Ti=0,02-0,1

Cr=0,001-0,1

V=0,001-0,1

H2=(0,1-3,6)·10-5

In=0,0001-0,03

C=0,00001-0,008

Al=the rest (RF patent No. 2215807)

Semi-finished products obtained from this alloy (forging, stamping), obladayuschee the fracture toughness, strength characteristics, low residual stresses, and not prone to warping. However, the alloy has a high enough technological plasticity, corrosion resistance and low strength of the welded joint, an increased rate of growth of fatigue cracks (SRTU)that you can't effectively use it in aircraft products, in particular the amphibious and carrier-based aircraft.

The technical object of the present invention is to provide alloy and products on its basis, with improved corrosion properties (ICC, RAC and CU), welding all types of welding, technological plasticity, good hardenability, the low rate of fatigue cracks (SRTO), especially in a corrosive environment. All of the above indicators can be used in the products of aviation technology, operated under all climatic conditions at a temperature of from -70°C to +80°C.

To achieve the objectives proposed based alloy of aluminum containing zinc, copper, magnesium, manganese, chromium, silicon, iron, characterized in that it further comprises scandium and at least one element from the group of zirconium, cerium in the following ratio of components (wt.%):

Zn=3,5-4,85

Cu=0.3 to 1.0

Mg=1,2-2,2

Mn=0,15-0,6

Fe=0,01-0,15

Si=0,01-0,12

Sc0,05-0,4

Cr=0.01 to 0.3

at least one element from the group:

Zr=0,05-0,15

CE=0,005-0,25

Al=rest

and products made from it.

A significant reduction in the total content of Zn and Mg by 25-30% in the proposed alloy leads to improved weldability and increased strength of welded joints. This effect is achieved due to the low sensitivity of the proposed alloy to the speed of cooling from a high temperature and during cooling in air. In the heat-affected zone of a welded joint is the decomposition of the supersaturated solid solution with the release of the main strengthening phase MgZn2. In addition, when the declared total content of Zn and Mg in the alloy system Al-Zn-Mg observed best manufacturability (Rminand there is virtually no tendency to corrosion under stress.

Additional alloying Sc has a significant strengthening effect due to the selection of the dispersed particle phase Al3Sc. In addition, Sc grinds grain structure in the weld seam area, which also contributes to the high strength of the welded connection.

Small additives of Zr and/or CE facilitate the grinding of grain and reducing the negative impact of Si on the characteristics of ductility and fracture toughness.

An example implementation

In pilot conditions were conducted melting offer the first alloy and the alloy of the prototype. From cast ingots made the following intermediate products: stamping, profile, sheets termoobrabotannyj for a two-step mode of aging (T3):

1st stage aging - 100±5° - 8 hours

2nd step aging - 170±5° - 5 hours

After fabrication of the samples tested on SRTU - the rate of growth of fatigue cracks (OST 1.90268-78).

Corrosion tests:

1. tests for intergranular corrosion (IGC) was carried out according to GOST 9.021;

2. tests on dissecting corrosion (RAC) was carried out according to GOST 9.904;

3. testing of welded joints according to GOST 1497-84

Table 1 presents the chemical composition of the proposed alloy (example 1-3) and alloy-prototype (example 4).

Table 2 presents the properties of these alloys.

As can be seen from table 2, the proposed alloy is superior alloy prototype characteristics corrosion resistance (RJC, IWC, KR), technological plasticity. The rate of growth of fatigue cracks in the proposed alloy is more than two times lower than that of the alloy of the prototype. The strength of the welded joint of the proposed alloy is as close as possible to the strength of the base metal. The proposed alloy low-alloy and therefore economically advantageous.

Thus, the resulting set of these properties allows you to apply the proposed alloy in to the operation of the fuselage skin, the elements of the power set of glider, seaplane, helicopter deck and aviation

Table 1

The chemical composition of the alloys
№ p/pAlZnCuMgMnCrFeSiScZrCENiCoBeMoVBH2
1The OST.3,50,31,20,150,010,010,010,050,15---------
24,00,71,80,40,10,080,090,2-0,25-- ------
34,851,02,20,60,30,150,120,40,050,005--------
47,02,01,20,020,020,120,08-0,05-0,020,1Ti0,06--0,0008--
Table 2

Properties of alloys
№ p/pRmin*RAC, BalIWC mmCU, MPaSRTU, dl/dNσinone.
1 0,8S2no3502,10,95
21,0S2no3002,00,92
31,3S2no3402,00,93
4 (prototype)2,2S3-40,1-0,22304,20,65
Rmin*- the bend radius to the thickness of the sheet S

σinest. IU.- the ratio of the strength of the welded joint to the strength of the base metal

1. The base alloy of aluminum containing zinc, copper, magnesium, manganese, chromium, iron, silicon, characterized in that it further comprises scandium and at least one element from the group of zirconium, cerium, in the following ratio com is onenow, wt.%:

Zinc3,5-4,85
Copper0.3 to 1.0
Magnesium1,2-2,2
Manganese0,15-0,6
Chrome0.01 to 0.3
Iron0,01-0,15
Silicon0,01-0,12
Scandium0,05-0,4
at least one element from the group:
Zirconia0,05-0,15
Cerium0,005-0,25
AluminumRest

2. The product from an alloy based on aluminum, characterized in that it is made from an alloy according to claim 1.



 

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2 cl, 1 ex, 3 tbl

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