Alloy based on aluminium and product thereof

 

The invention relates to the field of metallurgy, in particular to a deformable aluminum alloys of the aluminum - zinc - copper - magnesium intended for use as a structural material in aerospace and mechanical engineering. Alloy based on aluminium contains the following components, wt.%: zinc 5,5-9,0, magnesium 1,5-3,0, copper 1,4-3,0, Nickel of 0.002 to 0.3, the iron of 0.002 to 0.3, titanium 0,02-0,1, vanadium of 0.001 to 0.15, aluminum - rest ratio of Nickel to iron is less than 1, and the sum of Nickel and titanium is not more than 0.2. The technical result of the invention is to improve the hardenability, fracture toughness K1Cand durability under low-cycle fatigue. 2 S. and 2 C.p. f-crystals, 2 tab.

The present invention relates to the field of metallurgy and can be used in aerospace and mechanical engineering.

Known alloy based on aluminum the following chemical composition, wt.%: Zinc and 6.25-8.0 Magnesium - 1,2-2,2 Copper - 1,7-2,8 Iron -0.2 Zirconium - 0,1-0,25 Chrome0.05 Manganese -0.2 Titanium -0.05 Aluminum - Rest
While Fe+Si0,4
(EB fracture toughness (K1Cand durability when MCU (low cycle fatigue) in 'green' zones of a product, which reduces the life of the product.

Known alloy based on aluminum composition, wt.%:
Zinc - 5,1-8,1
Magnesium - 1,8-3,4
Copper - 1,2-2,6
at least one element from the group
Iron -0,5
Zirconia - 0,05-0,25
Chrome - 0,18-0,35
Manganese -0,7
Silicon -0,4
Titan -0,2
Aluminum - Rest
(U.S. patent 4569703, 22, 21/10, 1986) prototype.

The disadvantage is low hardenability and, as a consequence, the heterogeneity of the properties of the product volume, low resource of massive products, due to low values of fracture toughness (K1Cand durability when MCU.

The technical challenge is to improve the hardenability, fracture toughness K1Cand durability when MCU, which increases the service life and extends the range of manufactured products.

Features alloy of the following composition, wt.%:
Zinc - 5,5-9,0
Magnesium - 1,5-3,0
Copper - 1,4-3,0
Nickel - 0,002-0,3
Iron - 0,002-0,3
Titanium - 0,02-0,1
Vanadium is 0.001 to 0.15
Aluminum - Rest
The ratio Ni/Fe<1, Ni+Ti0,2.

The alloy as-0,2
Manganese - 0,12-0,8
Chrome - 0,02-0,25
Molybdenum - 0,001-0,1
Silicon is 0.001 to 0.2
Beryllium is 0.0001 to 0.05
Boron is 0.0001-0,03
Hydrogen (about 0.1-3.6)10-5
Carbon is 0.0001-0,004
The product from an alloy based on aluminum made of alloy composition, wt.%:
Zinc - 5,5-9,0
Magnesium - 1,5-3,0
Copper - 1,4-3,0
Nickel - 0,002-0,3
Iron - 0,002-0,3
Titanium - 0,02-0,1
Vanadium is 0.001 to 0.15
Aluminum - Rest
When the ratio of Ni/Fe<1, Ni+Ti0,2.

The product is made of alloy, which may contain at least one element from the group, wt.%:
Zirconia - 0,02-0,25
Cobalt - 0,01-0,2
Manganese - 0,12-0,8
Chrome - 0,02-0,25
Molybdenum - 0,001-0,1
Silicon is 0.001 to 0.2
Beryllium is 0.0001 to 0.05
Boron is 0.0001-0,03
Hydrogen (about 0.1-3.6)10-5
Carbon is 0.0001-0,004
We offer alloy differs from the prototype in that it further contains Nickel, vanadium in the following ratio, wt.%:
Zinc - 5,5-9,0
Magnesium - 1,5-3,0
Copper - 1,4-3,0
Nickel - 0,002-0,3
Iron - 0,002-0,3
Titanium - 0,02-0,1
Vanadium is 0.001 to 0.15
Aluminum - Rest
When the ratio of Ni/Fe<1, Ni+Ti0,2.

Alloy based on aluminum may contain at least one element from the group, m is,001-0,2
Beryllium is 0.0001 to 0.05
Boron is 0.0001-0,03
Hydrogen (about 0.1-3.6)10-5
Carbon is 0.0001-0,004
The product from an alloy based on aluminum differs in that it is made of alloy composition, wt.%:
Zinc - 5,5-9,0
Magnesium - 1,5-3,0
Copper - 1,4-3,0
Nickel - 0,002-0,3
Iron - 0,002-0,3
Titanium - 0,02-0,1
Vanadium is 0.001 to 0.15
Aluminum - Rest
The ratio Ni/Fe<1, Ni+Ti0,2.

The product is made of alloy, which may contain at least one element from the group, wt.%:
Zirconia - 0,02-0,25
Cobalt - 0,01-0,2
Manganese - 0,12-0,8
Chrome - 0,02-0,25
Molybdenum - 0,001-0,1
Silicon is 0.001 to 0.2
Beryllium is 0.0001 to 0.05
Boron is 0.0001-0,03
Hydrogen (about 0.1-3.6)10-5
Carbon is 0.0001-0,004
In the present invention in a matrix of solid solution alloy consisting of zinc, magnesium and copper, Nickel and iron forms the primary dispersed intermetallics crystallization of origin, which prevents the formation of coarse particles of intermetallic aluminide iron. In the presence of vanadium primary particles of intermetallic compounds of aluminide titanium and high Nickel particles are strongly chopped and evenly distributed in the matrix alloy. A small amount of Nickel is Oia and provides a uniform allocation of secondary phases, containing zinc, magnesium, copper in the grain volume, what has caused the increase in fracture toughness1Cand durability with MCU.

All this increases the lifetime of the product and extends the range of the products obtained.

Example. For comparison, were cast ingots of the proposed alloy and alloy selected for the prototype. The chemical composition of the alloys shown in table 1.

The ingots are homogenized by mode 460oC, 48 h was Heated under deformation to a temperature of 380-420oWith and subjected to hot rolling at a plate thickness of 80 mm was Heated for hardening to a temperature of 465oWith, was kept for 1.5 hours, and then spent feeding in water quenching and cooling of the tiles. Plates were subjected to the straightening elongation. Aging was carried out according to mode: T2 (110oC, 10 h+165oWith 16 hours).

Conducted research hardenability, mechanical properties, fracture toughness K1Cand durability when MCU when R=0,netmax= 160 samples from hole Kt=2,6 (table 2).

Thus, the invention allows to:
- increase in 2-2,3 times hardenability;
to increase the tensile strength in the Central part of the product at 10-12%;
to increase the fracture toughness K1Con 27-29%, durable to u the men.


Claims

1. The base alloy of aluminum containing zinc, magnesium, copper, iron, characterized in that it further contains Nickel, vanadium in the following ratio, wt. %:
Zinc - 5,5-9,0
Magnesium - 1,5-3,0
Copper - 1,4-3,0
Nickel - 0,002-0,3
Iron - 0,002-0,3
Titanium - 0,02-0,1
Vanadium is 0.001 to 0.15
Aluminum - Rest
the ratio of Nickel to iron is less than 1, and the sum of Nickel and titanium is not more than 0.2.

2. Alloy based on aluminium under item 1, characterized in that it can contain at least one element from the group wt. %:
Zirconia - 0,02-0,25
Cobalt - 0,01-0,2
Manganese - 0,12-0,8
Chrome - 0,02-0,25
Molybdenum - 0,001-0,1
Silicon is 0.001 to 0.2
Beryllium is 0.0001 to 0.05
Boron is 0.0001-0,03
Hydrogen (about 0.1-3.6)10-5
Carbon is 0.0001-0,004
3. The product from an alloy based on aluminum, characterized in that it is made of alloy chemical composition, wt. %:
Zinc - 5,5-9,0
Magnesium - 1,5-3,0
Copper - 1,4-3,0
Nickel - 0,002-0,3
Iron - 0,002-0,3
Titanium - 0,02-0,1
Vanadium is 0.001 to 0.15
Aluminum - Rest
the ratio of Nickel to iron is less than 1, and the sum of Nickel and titanium is not more than 0.2.

4. The product under item 3, characterized in that the alloy to manufacture the Manganese - 0,12-0,8
Chrome - 0,02-0,25
Molybdenum - 0,001-0,1
Silicon is 0.001 to 0.2
Beryllium is 0.0001 to 0.05
Boron is 0.0001-0,03
Hydrogen (about 0.1-3.6)10-5
Carbon is 0.0001-0,004

 

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