Aluminum-base alloy

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

 

The present invention relates to the field of metallurgy, in particular alloys based on aluminium, for the manufacture of the deformed semi-finished products used in industry and construction.

Known alloy system aluminum - zinc - magnesium composition, wt.%:

Zinc3,4-4,0
Magnesium1,3-1,8
Manganese0,2-0,6
Zirconia0,15-0,22
Chrome0,08-0,20
Aluminumrest

(Aluminum alloys. The Handbook. Structure and properties of semi-finished products from aluminum alloys. M.: metallurgy, 1984, str-282).

The disadvantage of this alloy are low strength characteristics of semi-finished products.

Features alloy based on aluminum composition, wt.%:

Aluminum
Zincof 4.5-5.6
Magnesium1,6-2,1
Manganese0,2-0,8
Scandium0,03-0,09
Zirconia0,05-0,12
Copperof 0.1-0.3
Titanium0,01-0,07
Molybdenum0,01-0,07
Cerium0,001-0,01
the rest of it.

The ratio between zinc and magnesium is 2.6 and 2.9.

We offer alloy differs from the prototype in that it further comprises molybdenum and cerium in the following ratio, wt.%:

Zincof 4.5-5.6
Magnesium1,6-2,1
Manganese0,2-0,8
Scandium0,03-0,09
Zirconia0,05-0,12
Copperof 0.1-0.3
Titanium0,01-0,07
Molybdenum0,01-0,07
Cerium0,001-0,01
Aluminumthe rest,

the ratio between the content of zinc and magnesium is 2.6 and 2.9.

The technical result is an improvement of the corrosion resistance obtained from the proposed alloy products and, consequently, increasing their lifespan.

The composition and ratio of the components in the proposed alloy provides a uniform grain, subgrain structure and uniform distribution by volume of the alloy hardening particles of zinc-magnesium phase due to the high density and thermal stability of the secondary particles of Al (Sc, Zr, Mo, Ti)formed during homogenization of the slit is and hot and the pressure treatment. This structure is characterized by a high elektromagnitnomu, and as a result, a high corrosion resistance. In addition, enhanced corrosion resistance promotes a dense oxide film covering the surface of the proposed alloy.

Example. The continuous casting method were obtained ingots with a diameter of 134 mm of the proposed structure.

The chemical composition of the cast ingots are shown in table 1.

OST
Table 1
No. SPL p/nAlloyZnMgMnScZrTiCuMoCEAl
1Offer4,51,60,20,030,050,010,10,010,001OST
2Offer5,01,80,50,060,090,040,20,030,005OST
3Offer5,62,10,80,090,120,070,30,070,01

After homogenizing the ingot was extruded into strips 8×100 mm, which was then tempered with temperature 460°With water and artificially aged very early because by mode 100°C, 20 h + 150°C, 10 h.

Thermally toughened strips was investigated using the methods of metallography and mechanical and corrosion properties. Technology in metallurgical production was estimated by the rate of expiration during pressing. The results of the study extruded strips are shown in table 2.

Tests on dissecting corrosion was carried out according to GOST 9.904-82. Evaluation of resistance against dissecting corrosion is carried out on a 10-point scale (resistance decreases with increasing ballast 1 to 10).

Tests for corrosion under tension was carried out according to GOST 9.901.4-89. Base test 90 days.

Table 2
PropertyKnown alloyWe offer alloy
No. 1No. 2No. 3
Tensile strength, MPa460480510
Yield strength, MPa400410440
Relative is dlinnie,% 181716
Dissecting corrosion, score222
The time to fracture when tested for corrosion under tension, the day>90>90>90
The flow rate during pressing m/min262219

Thus, the proposed composition of the alloy can improve the corrosion resistance of materials (resistance dissecting corrosion from 5 to 2 points and stress corrosion in several times) and, as a consequence, to increase the service life of semi-finished products at least two times.

Alloy based on aluminum, including zinc, magnesium, manganese, scandium, zirconium, copper, titanium, characterized in that it further comprises molybdenum and cerium in the following ratio, wt.%:

Zincof 4.5-5.6
Magnesium1,6-2,1
Manganese0,2-0,8
Scandium0,03-0,09
Zirconia0,05-0,12
Copperof 0.1-0.3
Titanium0,01-0,07
Molybd is n 0,01-0,07
Cerium0,001-0,01
AluminumRest

the ratio of zinc to magnesium is 2.6 and 2.9.



 

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Aluminum-base alloy // 2280092

FIELD: metallurgy.

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1 tbl

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2 cl, 1 ex, 3 tbl

Aluminum-base alloy // 2319762

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EFFECT: improved and valuable property of alloy.

1 tbl

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