Alloy based on aluminum, the product and method of manufacture

 

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 5,0-9,0, magnesium 0,3-3,0, copper 0,3-1,3, zirconium, 0.05 to 0.3, the iron 0.05 to 0.3, the silicon of 0.01 to 0.2, at least one element from the group of Nickel of 0.01 to 0.2, cobalt 0,01-0,2, aluminum - rest, with respect to at least one element from the group of Nickel, cobalt to zirconium is less than 1, and the sum of at least one element from the group: Nickel, cobalt, iron is not more than 0.4. The technical result of the invention is to improve the fracture toughness K1Cthe reduction of residual stresses and distortion, which reduces the complexity of manufacturing, increases the service life and extends the range. 3 s and 5 C.p. f-crystals, 2 tab.

The 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 - 6,35-8.0 Magnesium - 0,5-2,5 Med
At least one element from the group:
Potassium - 0,001-0,01
Sodium - 0.0001-0,01
Calcium is 0.0001-0.01 to
Aluminum - Rest
thus Zr+2Ti0,3; Si/Be0.2 (RF patent 2165995, 22, 21/10, 1999).

The disadvantage of this alloy is increased residual stress and distortion products. Because of low hardenability in massive sections of articles viscosity razrusheny K1Creduced and, as a consequence, low resource work products.

Known alloy based on aluminum composition, wt.%:
Zinc - 5,7-8,7
Magnesium - 1,7-2,5
Copper - 1,2-2,2
Manganese - < 0.02
Chrome - < 0.02
Zirconium 0.05 to 0.15
Iron - 0,07-0,14
Silicon <0,11
thus si+Mg<4,1; Mg>C (U.S. patent 6027582, With 22 21/10 2000) prototype.

The disadvantage is the low life of the product due to low values of fracture toughness K1Cin massive sections of the product, high residual stresses and distortion products.

There is a method of production of an alloy based on aluminum, including the production of ingots, deformation, hardening, including heating, cooling in the quenching environment, artificial ageing (French patent 2524908, C 22 F 1/04, 1983).

The disadvantage of this method is low basketb production of an alloy based on aluminum, including the production of an ingot, hot deformation in the semi-finished product, heating, supply of semi-finished product into the quenching medium, the forced circulation of the quenching medium (air sparging), and moving products into the quenching environment (Production of semi-finished products from aluminum alloys. Aluminum alloys. - M.: Metallurgizdat, 1971, S. 450) prototype.

The disadvantage of this method is the low resource the work of the products obtained because of the low fracture toughness1Cand high residual stresses and distortion, which increases the complexity in the manufacture of products and limits the range of manufactured products.

An object of the invention is to increase the fracture toughness K1Cthe reduction of residual stresses and distortion products, which reduces the complexity of manufacturing, increases the service life and extends the range of manufactured products.

Features alloy based on aluminum, contains, wt%:
Zinc - 5,0-9,0
Magnesium - 0,3-3,0
Copper - 0,3-1,3
Zirconia - 0,05-0,3
Iron - 0,05-0,3
Silicon - 0,01-0,2
At least one element from the group:
Nickel - 0,01-0,2
Cobalt - 0,01-0,2
Aluminum - Rest
The attitude of at least one element from the group of Nickel, cobalt is - not more than 0.4.

The alloy may contain at least one element from the group, wt.%:
Beryllium is 0.0001 to 0.05
Molybdenum - 0,001-0,1
Manganese - 0,01-0,1
Titanium - 0,02-0,1
Chrome - 0,001-0,1
Vanadium - 0,001-0,1
Hydrogen (about 0.1-3.6)10-5
Boron is 0.0001-0,03
Carbon - 0,00001-0,008
We offer the product of an alloy based on aluminum, of the following composition, wt.%:
Zinc - 5,0-9,0
Magnesium - 0,3-3,0
Copper - 0,3-1,3
Zirconia - 0,05-0,3
Iron - 0,05-0,3
Silicon - 0,01-0,2
At least one element from the group:
Nickel - 0,01-0,2
Cobalt - 0,01-0,2
Aluminum - Rest
The attitude of at least one element from the group of Nickel, cobalt to zirconium is less than 1, and the sum of at least one element from the group of Nickel, cobalt, iron is not more than 0.4.

The product is made of alloy, which may contain at least one element from the group, wt.%:
Beryllium is 0.0001 to 0.05
Molybdenum - 0,001-0,1
Manganese - 0,01-0,1
Titanium - 0,02-0,1
Chrome - 0,001-0,1
Vanadium - 0,001-0,1
Hydrogen (about 0.1-3.6)10-5
Boron is 0.0001-0,03
Carbon - 0,00001-0,008
The proposed method for the manufacture of products based alloy includes aluminum casting ingots, hot deformation in the material of sky speed of hardening alloy (oC/C), editing and artificial ageing.

Before quenching are additional editing and post-hardening lead to the degree of not more than 10 mm/m in the longitudinal or transverse direction of the product.

Artificial ageing are in two stages: first at a temperature of 80-150oFor 2-48 hours, and then at a temperature of 155-200oFrom within 2-48 hours

Before quenching on the surface of the semi-finished product perform parallel grooves with the ratio of length to width is equal to 1.1 to 2.5, to obtain the ratio of twice the volume remaining in the material of the metal to its full surface, multiplied by the maximum thickness equal to 0.02-0.42 and the supply of semi-finished product into the quenching medium to the cooling lead in the direction of the longitudinal axis of the grooves.

We offer alloy differs from the prototype in that it further contains at least one element from the group of Nickel, cobalt, when the ratio of components, wt.%:
Zinc - 5,0-9,0
Magnesium - 0,3-3,0
Copper - 0,3-1,3
Zirconia - 0,05 - 0,3
Iron - 0,05 - 0,3
Silicon - 0,01-0,2
At least one element from the group:
Nickel - 0,01-0,2
Cobalt - 0,01-0,2
Aluminum - Rest
The attitude of at least one element from the group Nickel, cobalt to zirconium with

Method of production of an alloy based on aluminum differs from the prototype in that the cooling during hardening lead with a speed of 0.8-3Vkrwhere Vkrcritical speed of hardening alloy,oWith/s

Before quenching are additional editing and post-hardening lead to the degree of not more than 10 mm/m in the longitudinal or transverse direction of the product.

Artificial ageing are in two stages: first at a temperature of 80-150oFor 2-48 hours, and then at a temperature of 155-200oFrom within 2-48 hours

Before quenching on the surface of the semi-finished product perform parallel grooves with the ratio of length to width is equal to 1.1-2.5 to obtain the ratio of twice the volume remaining in the material of the metal to its full surface, multiplied by the maximum thickness equal to 0.02-0.42 and the supply of semi-finished product into the quenching medium to the cooling lead in the direction of the longitudinal axis of the grooves.

In the present invention in a matrix of solid solution alloy consisting of zinc, magnesium and copper in aluminum, uniformly dispersed particles of the primary phases of crystallization origin containing refractory elements such as iron, cobalt, Nickel, and is also equal to the cooling, in which the volume fraction of grain boundary fracture (SGR) does not exceed 20%, while improving the fracture toughness K1C, hardenability, reduced residual stress and warpage of the product. All this increases the lifetime of the product and extends the range of the products obtained.

Examples. For the comparative analysis were cast ingots of the proposed chemical composition of the alloy and chemical composition of the alloy selected for the prototype. The chemical composition of the alloys shown in table.1.

The ingots are homogenized by mode 460oC, 48 h, were subjected to free forging to produce forging thickness of 150 mm On the surface of the forgings were performed parallel grooves with the ratio of length to width is equal to 2, the ratio of twice the volume remaining in the product metal to its full surface, multiplied by the maximum thickness, made of 0.21. Then the product was subjected to the pre-correction on the press, by typing them in the tolerance to warping. The product was heated for hardening to a temperature of 465oWith the shutter speed was 2.5 hours, was filed in the quenching medium in the direction of the axis of the grooves, cooled in the quenching water with speed 2,03oC/C, which is equal to 2.9 Vkr.

Hardened products ruled on the press projectors is+ II senior - 180oS, 8 o'clock

Similar forgings produced from the known alloy according to the method chosen for the prototype.

Mechanical properties were investigated in a longitudinal direction, the fracture toughness K1Cin the areas of PD and VD, residual stresses in high-rise direction of the products, the warping. The results of the tests are presented in table. 2.

Thus, the invention improves to 5-7 times the hardenability of the alloy, the fracture toughness (K1C) increase by 10-25%, to reduce the level of residual stresses in 40-50 times and warping in 25-30 times and, consequently, to increase the service life and to expand the range of manufactured products.


Claims

1. The base alloy of aluminum containing zinc, magnesium, copper, zirconium, iron, silicon, characterized in that it additionally contains at least one element from the group of Nickel, cobalt, in the following ratio, wt. %:
Zinc - 5,0-9,0
Magnesium - 0,3-3,0
Copper - 0,3-1,3
Zirconia - 0,05-0,3
Iron - 0,05-0,3
Silicon - 0,01-0,2
At least one element from the group:
Nickel - 0,01-0,2
Cobalt - 0,01-0,2
Aluminum - Rest
when this ratio is at least one element from the group: Nickel the t - iron not more than 0.4.

2. Alloy based on aluminium under item 1, characterized in that it can contain at least one element from the group wt. %:
Beryllium is 0.0001 to 0.05
Molybdenum - 0,001-0,1
Manganese - 0,01-0,1
Titanium - 0,02-0,1
Chrome - 0,001-0,1
Vanadium - 0,001-0,1
Hydrogen (about 0.1-3.6)10-5
Boron is 0.0001-0,03
Carbon - 0,00001-0,008
3. The product from an alloy based on aluminum, characterized in that it is made of alloy chemical composition, wt. %:
Zinc - 5,0-9,0
Magnesium - 0,3-3,0
Copper - 0,3-1,3
Zirconia - 0,05-0,3
Iron - 0,05-0,3
Silicon - 0,01-0,2
At least one element from the group:
Nickel - 0,01-0,2
Cobalt - 0,01-0,2
Aluminum - Rest
when this ratio is at least one element from the group of Nickel, cobalt to zirconium is less than 1, and the sum of at least one element of the group: Nickel, cobalt, iron is not more than 0.4.

4. The product from an alloy based on aluminium under item 3, characterized in that the alloy for its manufacture may contain at least one element from the group wt. %:
Beryllium is 0.0001 to 0.05
Molybdenum - 0,001-0,1
Manganese - 0,01-0,1
Titanium - 0,02-0,1
Chrome - 0,001-0,1
Vanadium - 0,001-0,1
Hydrogen (about 0.1-3.6)10-5
Boron is 0.0001-0,03
Peachy deformation in the semi-finished product, training, including heating and cooling in the quenching medium, the edit, artificial ageing, characterized in that the cooling during hardening lead with a speed of 0.8-3 Vkrwhere Vkrcritical speed of hardening alloy,oC/s

6. Method of production of an alloy based on aluminium under item 5, characterized in that before quenching are additional editing and post-hardening lead to the degree of not more than 10 mm/m in the longitudinal or transverse direction of the product.

7. Method of production of an alloy based on aluminium under item 5 or 6, characterized in that the artificial ageing are in two stages: first at 80-150oC for 2-48 hours, and then at 155-200oC for 2-48 hours

8. Method of production of an alloy based on aluminum according to any one of paragraphs. 5-7, characterized in that before quenching on the surface of the semi-finished product perform parallel grooves with the ratio of length to width is equal to 1.1-2.5 to obtain the ratio of twice the volume remaining in the material of the metal to its full surface, multiplied by the maximum thickness equal to 0.02-0.42 and the supply of semi-finished product into the quenching medium to the cooling lead in the direction of the longitudinal axis of the grooves.

 

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