High-tensile deformed alloy on base of aluminium and item out of this alloy

FIELD: metallurgy.

SUBSTANCE: invention refers to deformed thermally hardened high-tensile aluminium alloys Al-Zn-Mg-Cu designed for fabrication of all kinds of deformed semi-finished products, including thin sheets used in aircraft and machine engineering and other branches of industry. Deformed alloy on base of aluminium and an item out of it contain the following components, wt %: zinc 2.5-4.0, magnesium 4.1-6.5, copper 0.2-1.0, iron to 0.25, silicon to 0.15, scandium 0.005-0.3, zirconium 0.005-0.25, nickel and/or cobalt to 0.1, titanium to 0.15, boron and/or carbon to 0.05, at least one element out of group: hafnium to 0.15, molybdenum to 0.15, cerium to 0.15, manganese to 0.5, chromium to 0.28, yttrium to 0.15, vanadium to 0.15, niobium to 0.15, aluminium and unavoidable impurities - the rest, also ratio of Mg contents to Zn contents is more or equal to 1.1.

EFFECT: production of alloy and items out of it possessing raised strength properties at simultaneous increased wear-resistance, reduced rate of crack growth, increased durability of welded connections and reduced density, which results in increased resource and reliability of items operation and in reduced weight of structures.

3 cl, 2 tbl, 1 ex

 

The invention relates to the field of metallurgy, in particular to a deformable thermally hardened vasopressin aluminum alloys of the system Al-Zn-Mg-Cu, intended for manufacturing of all kinds of deformable semi-finished products (including thin sheets)used in aircraft construction, mechanical engineering and other industries, including for welded structures.

Known for high strength alloy system Al-Zn-Mg-Cu (RF Patent 2165996 published 27.04.2001, SS 21/10) the following chemical composition (mass fraction, %):

Magnesium1,8-2,8
Zinc5,0-7,0
Copper1,4-2,0
Manganese0,2-0,6
Chrome0,1-0,25
Iron0,05-0,25
Silicon0,02-0,1
Titanium0,005-0,07
Aluminumrest

The ratio of Mn to Cr more than or equal to 1.5.

The disadvantage of this alloy is a high density (d=2.85 g/with the 3), is not high enough strength and resource characteristics, which reduces the reliability and life of the products, their weight efficiency. In addition, this alloy welded.

Closest to the proposed invention is a welded alloy based on aluminium system Al-Zn-Mg-Cu having the following chemical composition (mass fraction, %):

Zinc4,4-9,0
Magnesiumof 0.5-3.5
Copper0,01-1,2
Ironto 0.35
Siliconto 0.25
Nickel and/or cobalt0.1
Chrometo 0.35
Vanadiumto 0.15
Titaniumto 0.15
Bor0.03
Calcium0.05

At least one element from the group:

Manganese/td> to 0.8
Zirconiato 0.25
Scandiumto 0.25
Hafniumto 0.25
Aluminumrest

When the ratio of Mg/Cu≥1,8 (application RU # 2006132906/02, CL SS /21/10).

The disadvantage of this alloy is a high density (d=2.85 g/cm3), is not sufficiently high strength properties and resource characteristics, such as fracture toughness, the pause crack growth, fatigue life.

The objective of the invention is to provide a structural base alloy of aluminum having low density, high strength, high resource characteristics and high strength welded joints.

The technical result is to increase the strength properties of the alloy while improving the fatigue resistance, the decrease in the rate of crack growth, increase strength of welded joints and a decrease in the density (specific gravity), which leads to increased resource and reliability of products, reduces the weight of the structures.

The technical result is achieved by the fact that the alloy based on aluminum has the following chemical composition (mass fraction, %):

<>
Zinc2,5-4,0
Magnesium4,1-6,5
Copper0,2-1,0
Ironto 0.25
Siliconto 0.15
Scandiumof 0.005 to 0.3
Zirconia0,005-0,25
Nickel and/or cobalt0.1
Titaniumto 0.15
Boron and/or carbon0.05

At least one element from the group:

Hafniumto 0.15
Molybdenumto 0.15
Ceriumto 0.15
Manganese0.5
Chrometo 0.28
Yttriumto 0.15
is anadi to 0.15
Niobiumto 0.15
Aluminumrest

When the content of Mg to the content of Zn is greater than or equal to 1.1.

The alloy may also contain as impurities such as calcium, bismuth, sodium, potassium, hydrogen, beryllium, lead, tin, and lithium in amounts not more than 0.01% of each and not more than 0.1% in total.

The task is also solved by the product made from the above-mentioned alloy.

The principal difference of the alloy from the well-known is that it is due to the selected range of content elements such as magnesium, zinc, copper and the ratio between Mg and Zn≥1,1 is in a different phase than the known alloy. If in the known alloy phase-hardener particles are phase η(MgZn2), the suggested alloy particles triple phase T(Al2Mg3Zn3), which provide a higher level of complex resource and strength properties and increased stability. The selected range of the content of basic elements (magic, zinc and copper) provides more low density (specific gravity) of the proposed alloy in comparison with the known.

The joint presence of alloy elements such as scandium, zirconium, nicely/or cobalt, leads to the formation of complex phases of Al3(Sc, Zr, Ni/Co), which leads to additional hardening alloy, getting supermalloy precrystallization structure in cold-rolled sheets, the improvement of the properties of welded joints.

In addition, excessive levels of magnesium compared with zinc), large atoms which, entering into solid aluminum solution, increase the lattice parameter of the aluminum matrix is reduced to almost zero difference in the lattice parameters of the aluminum matrix and released from solid solution phase of Al3(Sc, Zr, Ni/Co), thereby increasing their dispersion and thermal stability. The positive effect of phases of Al3(Sc, Zr, Ni/Co) in the proposed alloy is significantly higher than in known.

Copper is in solid solution and the phase T(Al2Mg3Zn3), which provides a greater hardening effect. The introduction of at least one element from the group of hafnium, molybdenum, chromium, yttrium, manganese, cerium, vanadium, niobium leads to higher thermal stability of phases of Al3(Sc, Zr, Ni/Co) due to the dissolution of these elements in this phase. This leads to stable precrystallization patterns products, improving their mechanical properties. The presence of complex intermetallic compounds formed by these element is mi, also allows one to obtain high mechanical properties of welded connections.

Examples

The method of semi-continuous casting have flat bars section 165×550 mm, the composition of which is given in table 1.

The ingots were ofhomogeneous, machined and laminated first to the hot thickness of 5.0 mm, and then holodnuju sheets of a thickness of 2.5 mm, which were hardened and artificially aged. The same leaves were obtained from an alloy of the prototype. The results of the tests artificially aged sheets are presented in table 2.

As can be seen from table 2, the sheets of the proposed alloy superior to the known alloy according to the characteristics of static strength: the tensile strength σin5-7% and the yield stress (σ02) by 10-15%. We offer alloy has a 4-5% lower density than known. Moreover, the alloy has a markedly higher resource characteristics: smaller, almost twice the growth rate of fatigue cracks (SRTO), higher by 10-20% fracture toughness (KWithYand twice the number of cycles to failure when tested in fatigue. In addition, the strength of the welded connection (automatic argon arc welding) is also higher in the proposed alloy 8-14%.

The use of the alloy will reduce the weight of them made products due to minilaparotomy alloy and higher strength as the base material, and welded connections and to increase the reliability of the products due to the large values of characteristics of the fracture toughness and lower rate of fatigue cracks and higher fatigue resistance.

Table 1.
Chemical composition (mass fraction, %)
Chemical
The composition of the alloy, mass fraction, %
KnownProposed
12
Zn6,32,83,5
Mg2,66,25,0
Cu0,350,650,45
Fe0,260,160,14
Si,12 0,10,08
Ni0,010,001-
Co--0,01
Cr0,21-0,01
V0,080,005-
Ti0,060,040,03
B0,0010,00080,0005
C-0,0003
Ca0,0008--
Mn0,25-0,01
Mo-0,01-
Sc-0,240,15
Zr0,060,060,12
Ce--0,03
Y-0,005-
Hf--0,005
Nb--0,001
Alrestrestrest

Table 2
Comparison of typical properties sheet thickness of 2.5 mm from the proposed alloy and known CPF is A.
AlloyDensity, g/cm3σin, MPaσ02, MPaδ, %SRTU, mm/clcl for δk means=MP√mToWithY, MPa√m for samples with a width of 160 mmFatigue resistance, cycle, when σmax=160 MPa, f=30 HzσinSt, MPa
Offer 12,7056050014,52,080400350
Offer 22,7158052012,52,685480370
Known2,8553044010,55,665250320

1. De is formiruemye alloy based on aluminum, containing zinc, magnesium, copper, iron, silicon, scandium, zirconium, Nickel and/or cobalt, titanium, aluminum and inevitable impurities, characterized in that it additionally contains boron and/or carbon and at least one element from the group of hafnium, molybdenum, cerium, manganese, chromium, yttrium, vanadium, niobium in the following ratio of elements, wt.%:

Zinc2,5-4,0
Magnesium4,1-6,5
Copper0,2-1,0
Ironto 0.25
Siliconto 0.15
Scandiumof 0.005 to 0.3
Zirconia0,005-0,25
Nickel and/or cobalt0.1
Titaniumto 0.15
Boron and/or carbon0.05
at least one element from the group:
Hafniumto 0.15
Molybdenum to 0.15
Ceriumto 0.15
Manganese0.5
Chrometo 0.28
Yttriumto 0.15
Vanadiumto 0.15
Niobiumto 0.15
Aluminum and inevitable impuritiesrest

moreover, the content of Mg to the content of Zn is greater than or equal to 1.1.

2. The alloy according to claim 1, characterized in that as inevitable impurities it contains calcium, bismuth, sodium, potassium, hydrogen, beryllium, lead, tin, and lithium in an amount of not more than 0.01 wt.% each and not more than 0.1 wt.% in the sum.

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



 

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