Cryogenic wrought non-heat-treatable alloy on basis of aluminum

FIELD: metallurgy.

SUBSTANCE: alloy contains following components, wt %: magnesium 4.1-4.9, titanium 0.01-0.04, beryllium 0.0001-0.005, zirconium 0.05-0.12, scandium 0.17-0.30, cerium 0.0001-0.0009, manganese 0.19-0.35, chromium 0.01-0.05, group of elements, containing iron and silicon 0.06-0.25, aluminium is the rest, at that value of iron content relation to silicon content has to be not less than unity.

EFFECT: increased strength property, strength of welded connection at cryogenic temperatures, weight saving of welded fabrication, manufactured from suggested alloy.

2 tbl, 1 ex

 

The present invention relates to the field of metallurgy, in particular to thermally deformable neurocinema alloys intended for use in the form of deformed semi-finished products as a structural material primarily for welded structures operating at cryogenic temperatures.

Known cryogenic deformable thermally neurocinema welded alloy based on aluminum the following chemical composition (wt.%):

Magnesiumof 4.45
Manganese0,8
Chrome0,10
AluminumRest

(see Fgenesh, Dightman, Etenders. In the book: Mechanical properties of structural materials at low temperatures. M, metallurgy, 1983, s).

However, the existing alloy has low strength properties.

Known cryogenic deformable thermally neurocinema welded alloy based on aluminum, designed for use in the form of deformed semi-finished products as a structural material (see patent RU No. 2085607, MCL. SS 21/06, 1997), the following chemical composition (wt.%) prototype:

Titanium
Magnesiumof 3.9 to 4.9
of 0.01-0.1
Beryllium0,0001-0,005
Zirconia0,05-0,15
Scandium0,20-0,50
Cerium0,001-0,004
AluminumRest

The disadvantage of this alloy is low strength of welded joints at cryogenic temperatures.

Proposed cryogenic deformable thermally neurocinema the base alloy of aluminum containing magnesium, titanium, beryllium, zirconium, scandium and cerium, which further comprises manganese, chromium and the group of elements including iron and silicon, in the following ratio of components (wt.%):

Magnesium4,1-4,9
Titanium0,01-0,04
Beryllium0,0001-0,005
Zirconia0,05-0,12
Scandium0,17-0,30
Cerium0,0001-0,0009
Manganesefor 0,19 0,35
Chrome0,01-0,05
Group of elements,the
including iron
and silicon0,06-0,25
AluminumRest

when the volume ratio of iron content to the silicon content should not be less than one.

We offer alloy differs from the known fact that it further contains manganese, chromium and the group of elements including iron and silicon, and components are taken in the following ratio (wt.%):

Magnesium4,1-4,9
Titanium0,01-0,04
Beryllium0,0001-0,005
Zirconia0,05-0,12
Scandium0,17-0,30
Cerium0,0001-0,0009
Manganesefor 0,19 0,35
Chrome0,01-0,05
Group of elements,the
including iron
and silicon0,06-0,25
AluminumRest

thus the ratio of iron content to the silicon content should not be less than one.

The technical result is an increase in the strength characteristics of the alloy and, consequently, increasing the strength of welded joints at cryogenic temperatures, which will reduce weight and thereby improve the characteristics of weight welded structures aircraft operating at cryogenic fuel.

Under the proposed content and ratio of the components proposed in the IOM alloy secondary allocations fine intermetallic compounds, contain aluminum, scandium, zirconium and other transition metals included in the composition of the alloy, and optimization of the morphology of primary intermetallics crystallization origin containing mainly aluminum, iron and silicon, is provided with a high level of strength properties of alloy and welded joints. At the same time sufficiently flexible matrix representing mainly solid solution of magnesium and manganese in aluminium, due to the high stock of plasticity can maintain the necessary level of plastic properties and high performance alloy and welded joints at cryogenic temperatures.

Example

Received offer alloy mixture consisting of aluminum A99 motorway, magnesium MG, double ligatures aluminum-titanium, aluminium-beryllium, aluminum-zirconium, aluminium-scandium, aluminium-cerium, aluminum-manganese, aluminum-iron and silumin (compounds 1, 2)and part 3 of the mixture consisting of waste compositions 1 and 2.

The alloy was prepared in an electric melting furnace and method of semi-continuous casting cast slabs section 90×220 mm formulations of the alloy shown in table 1.

The homogenized ingots were subjected to mechanical processing, after which the hot rolling mill at 400°rolled to a thickness of 7.5 mm, then the mill cold procad is - to a thickness of 3 mm, cold-Rolled billet was annealed in an electric furnace with air circulation and ruled on rolemodelling machine.

The part thus obtained is annealed sheets of 3 mm thickness was subjected to automatic argon-arc welding tungsten electrode with filler wire of the same composition as the parent metal. Weld disposed along the fiber. Material for testing served annealed sheets of 3 mm thickness and welded plate. From sheets and welded plates cut standard transverse samples, which were tested for tensile strength at cryogenic temperatures. Determined the mechanical properties of sheets: tensile strength σinyield strength of σof 0.2, elongation δand tensile strength of welded joints with reinforcement seam σinSt. We also carried out tests of alloy-prototype (part 4, table 1). The results are given in table 2.

As can be seen from table 2, the proposed alloy and welded connections have the strength 3-15 MPa higher than in the known alloy while maintaining ductility. This will allow for 3-5% reduction in the weight of the cryogenic welded structures made of the proposed alloy.

The application of the proposed alloy in space technology will allow you to create a reliable and high-tech welded design the AI aircraft working on a highly efficient and eco-friendly cryogenic fuel. In the manufacture of welded structures offer alloy can also be used as filler material for fusion welding.

Table 1
Alloynumber ofChemical composition, wt.%
MagnesiumTitaniumBerylliumZirconiaScandiumCeriumManganeseChromeIronSiliconFe/SiAluminum
Offer14,10,010,00010,050,170,00010,190,010,030,031Rest
2a 4.90,040,0050,120,300,00090,350,050,150,11,5Rest
34,50,020,0010,080,240,00050,30,3 0,060,051,2Rest
The placeholder44,40,10,0030,10,40,003-----Rest
Note: the Fe/Si ratio of iron content to the silicon content

77 K
Table 2
Alloynumber ofTemperature testMechanical properties of annealed sheetsStrength of welded joints
σin, MPaσof 0.2, MPaδ, %σinSt, MPa
Offer177 K48034836450
20K62441838480
277 K49035034454
20K63042536488
348535035450
20K62842037485
The placeholder477 K47534534445
20K62141536475
Note: σin- tensile strength, σof 0.2- yield strength, δ - elongation, σinSt- the tensile strength of the welded specimen with reinforcement seam.

Cryogenic deformable thermally neurocinema the base alloy of aluminum containing magnesium, titanium, beryllium, zirconium, scandium and cerium, characterized in that it further contains manganese, chromium and the group of elements including iron and silicon, in the following ratio, wt.%:

magnesium4,1-4,9
titanium0,01-0,04
beryllium0,0001-0,005
Zirconia0,05-0,12
scandium0,17-0,30
cerium0,0001-0,0009
manganesefor 0,19 0,35
chrome 0,01-0,05
the group of elements containing iron
and silicon0,06-0,25
aluminumrest

thus the ratio of iron content to the silicon content should not be less than one.



 

Same patents:

FIELD: metallurgy; alloys.

SUBSTANCE: alloy and products out of this alloy contain the following elements, mas.% magnesium 0.6-1.2; silicon 0.6-1.2; manganese 0.3-1.0; iron 0.1-0.5; copper 0.05-1.0; titanium 0.005-0.05; at least one element out of the group: tin 0.6-1.0; bismuth 0.2-0.8; at least one element of the group: gallium 0.001-0.05; calcium 0.001-0.05; at least one element from the group: boron 0.0005-0.005; carbon 0.0001-0.005; aluminium - the rest.

EFFECT: there obtained an alloy and products out of it not containing lead and possessing upgraded machinability, high corrosion resistance and strength.

2 cl, 4 dwg, 2 tbl, 1 ex

FIELD: metallurgy.

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19 cl, 7 tbl, 1 dwg, 2 ex

FIELD: nonferrous metallurgy.

SUBSTANCE: invention is intended for use in metallurgy, mechanical engineering, and aircraft industry, in particular for manufacturing honeycomb structures. Alloy is composed of, wt %: magnesium 8-10, manganese 0.1-0.15, zirconium 0.15-0.2, cobalt 0.05-0.2, boron 0.005-0.007, beryllium 0.001-0.02, iron 0.15-0.2, silicon 0.15-0.2, titanium 0.1-0.2, aluminum - the balance. Ingot for manufacturing structural foil is obtained by semicontinuous casting in rotary crystallizer at volumetric cooling 4-20°C/sec. Structural foil manufacturing process comprises homogenization, hot rolling, annealing, cold rolling followed by annealing in air atmosphere, second cold rolling followed by annealing, and final cold rolling.

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3 cl, 3 tbl

FIELD: metallurgy of aluminum-based alloys on base of Al-Mg-Mn system for manufacture of armored semi-finished products and articles for aviation and shipbuilding and other civil equipment.

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3 cl, 1 dwg, 3 tbl, 3 ex

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EFFECT: improved and valuable properties of alloy and article.

3 cl, 3 tbl, 1 ex

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FIELD: alloy metallurgy.

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3 cl, 3 tbl, 1 ex

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EFFECT: high resistance to ballistic action of projectiles; enhanced corrosion resistance and weldability; reduced mass.

3 cl, 1 dwg, 3 tbl, 3 ex

FIELD: nonferrous metallurgy.

SUBSTANCE: invention is intended for use in metallurgy, mechanical engineering, and aircraft industry, in particular for manufacturing honeycomb structures. Alloy is composed of, wt %: magnesium 8-10, manganese 0.1-0.15, zirconium 0.15-0.2, cobalt 0.05-0.2, boron 0.005-0.007, beryllium 0.001-0.02, iron 0.15-0.2, silicon 0.15-0.2, titanium 0.1-0.2, aluminum - the balance. Ingot for manufacturing structural foil is obtained by semicontinuous casting in rotary crystallizer at volumetric cooling 4-20°C/sec. Structural foil manufacturing process comprises homogenization, hot rolling, annealing, cold rolling followed by annealing in air atmosphere, second cold rolling followed by annealing, and final cold rolling.

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3 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: said utility invention relates to the manufacture of products of a rolled aluminium alloy highly resistant to damage. The method involves casting an ingot with a chemical composition selected from the group consisting of AA2000, AA5000, AA6000, and AA7000 alloys, homogenisation and/or heating of the ingot after casting, hot rolling of the ingot into a hot-rolled product and, optionally, cold rolling of the hot-rolled product into a cold-rolled product. After the hot rolling, the hot-rolled product is cooled from the hot-rolling mill output temperature (Tout) to 150°C or lower, at a controlled cooling rate decreasing within the set range according to a continuous cooling curve determined using the following expression: T(t)=50-(50-Tout)eα-t, where T(t) is the cooling temperature (°C) as a function of the cooling time (hours), t is the cooling time (hours), and α is a parameter determining the cooling rate, within a range of -0.09±0.05 (hr-1).

EFFECT: enhanced impact strength; resistance to growth of fatigue cracks, and corrosion resistance without strength deterioration.

19 cl, 7 tbl, 1 dwg, 2 ex

FIELD: metallurgy; alloys.

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EFFECT: there obtained an alloy and products out of it not containing lead and possessing upgraded machinability, high corrosion resistance and strength.

2 cl, 4 dwg, 2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: alloy contains following components, wt %: magnesium 4.1-4.9, titanium 0.01-0.04, beryllium 0.0001-0.005, zirconium 0.05-0.12, scandium 0.17-0.30, cerium 0.0001-0.0009, manganese 0.19-0.35, chromium 0.01-0.05, group of elements, containing iron and silicon 0.06-0.25, aluminium is the rest, at that value of iron content relation to silicon content has to be not less than unity.

EFFECT: increased strength property, strength of welded connection at cryogenic temperatures, weight saving of welded fabrication, manufactured from suggested alloy.

2 tbl, 1 ex

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

FIELD: metallurgy.

SUBSTANCE: Invention relates to metallurgy and may be sued in producing strained semi-finished products from thermally non-hardenable welded aluminium-based alloys used as structural and semiconductor material, primarily, in aerospace and nuclear engineering. Aluminium-base alloy comprises the following components in wt %: magnesium - 1.8-2.4, scandium - 0.2-0.4, zirconium - 0,1-0.2, cerium - 0.0001-0.005, iron - 0.01-0.15, silicon - 0.01-0.1, aluminium making the rest. Note here that iron-to-silicon content ratio may not be less than unity.

EFFECT: higher strength and conductivity, hence, reduced weight.

2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: aluminium-based alloy contains the following, wt %: zinc - 6.35 - 8.0, magnesium - 0.5 - 2.5, copper - 0.8 -1.3, iron - 0.02 - 0.25, silicon - 0.01 - 0.20, zirconium - 0.07 - 0.20, manganese - 0.001 - 0.1, chrome - 0.001 - 0.05, titanium - 0.01 - 0.10, boron - 0.0002 -0.008, beryllium - 0.0001 - 0.05, at least one element from potassium, sodium, calcium group in quantity of 0.0001 - 0.01 each, aluminium is the rest; at total content of zinc, magnesium, copper within 8.5-11.0, and that of zirconium, manganese and chrome - within 0.1-0.35. Method involves loading and melting of charge components, flux treatment of molten metal, molten metal purification, further vacuum treatment of molten metal in mixer and casting of ingots; boron is added to molten metal in the form of Al-Ti-Be alloy which is distributed at least one hour before molten metal pouring to mixer along the whole surface area of mixer bottom; at that, mixer is pre-heated to temperature which is by 15-30C more than molten metal temperature, and vacuum treatment of molten metal in mixer is performed at temperature of 695-720C, during 45-90 minutes.

EFFECT: invention allows obtaining high-strength aluminium alloys with absence of primary intermetallic compounds, decreased content in them of non-metallic inclusions and dissolved gases, with stable properties and optimum size of grain on basis of standard furnace and process equipment.

2 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: aluminium alloy contains the following components: from 4.5 to 6.5 wt % magnesium, from 1.0 to 3.0% wt % silicon, from 0.3 to 1.0% wt % manganese, from 0.02 to 0.3% wt % chromium, from 0.02 to 0.2% wt % titanium, from 0.02 to 0.2 wt % zirconium, from 0.0050 to 1.6% wt % of one or more rare-earth metals, max. 0.2% iron, and the rest is aluminium.

EFFECT: alloy has high strength properties and is intended for use in die casting and related methods.

8 cl, 1 tbl

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