High-strength sparingly-alloyed aluminium-based alloy
SUBSTANCE: invention may be used for making critical parts operated at high loads at 150°C, e.g, those of aircraft, cars and trucks, etc. Proposed composition contains the following substances, in wt %: 5.5-6.5 Zn, 1.7-2.3 Mg, 0.4-0.7 Ni, 0.3-0.7 Fe, 0.02-0.25 Zr, 0.05-0.3 Cu. Its solvus temperature does not exceed 410°C while hardness makes, at least 150 HV.
EFFECT: higher strength and machinability.
3 cl, 3 tbl, 3 ex, 2 dwg
The invention relates to the field of metallurgy materials based on aluminum and can be used to obtain products operating under high loads at temperatures up to 150°C: details of aircraft (airplanes, helicopters, rockets, cars and other vehicles (including bicycles, scooters, trucks), details of sports equipment and other
The most durable wrought aluminum alloys type B95 (σin=500-600 MPa) refer to the system Al-Zn-Mg-Cu (Industrial aluminum alloys /Ref. ed./ Aliyev YEAR, Altman MB and others - M.: Metallurgiya, 1984. 528 C.). They have a low casting properties, therefore, these alloys are not used to obtain shaped castings.
Known alloy based on aluminum-Nickel eutectic, disclosed in the patent RU 2158780 from 10.11.2000, This alloy contains a matrix formed of a solid solution of zinc, magnesium and copper in aluminum with uniformly distributed dispersed particles of the phases formed by aluminum, zinc, magnesium and copper, uniformly distributed in the matrix particles of Nickel aluminides crystallization of origin and uniformly distributed in the matrix particles, at least one of the aluminides, selected from the group composed of chromium aluminides and zirconium aluminides, when the total content of from 0.1 to 0.5 vol.% Mat is the Rial.
This alloy can be to get castings with improved casting properties due to additives of Nickel, which forms aluminides eutectic origin. However, to achieve high strength properties, you must ensure that these aluminides globular form, which requires the operation of spheroidizing annealing. As copper, which is a known material, greatly reduces the equilibrium solidus (medium composition, it is below 530°C), requires a relatively high dispersion of the original structure, which limits the use of the proposed alloy is relatively small castings simple form. In addition, the presence of copper in the last complicates the phase composition, which can lead to instability of the mechanical and technological properties.
The closest to the invention is an alloy based on aluminum, disclosed in the patent RU 2245388 (publ. 27.01.2011, bull.№3). This alloy contains zinc, magnesium and Nickel, iron, zirconium and copper at the following component ratio, wt.%:
and at this temperature the equilibrium solidus is not less than 550°C, and the hardness is not less than 180 HV.
Achieving high mechanical properties is achieved by the implementation of patterns representing a matrix formed of a solid solution of aluminum dispersed uniformly distributed particles of secondary allocations, and uniformly distributed in the matrix particles aluminides containing Nickel and iron, eutectic origin. The number of these aluminides is 5,0-6,3%vol.
The technical result is the creation of new high-strength alloy, capable of thermal hardening intended to obtain as shaped castings and deformed semi-finished products.
However, this alloy is not enough technological when getting rolled sheets (thickness less than 0.5 mm by cold rolling. The second drawback is that the alloy is not designed to produce shaped castings in a single form. The third disadvantage is that the alloy contains expensive additive Nickel in quantities of more than 1 wt.%.
The problem is subramania is the creation of new high-strength low-alloy aluminium alloy, containing no more than 0.8% Ni and intended to obtain as shaped castings and deformed semi-finished products and high manufacturability while processing pressure (in particular, upon receipt of rolled sheets cold rolled) and casting (in particular, in a single form).
The problem is solved by the fact that the base alloy of aluminum contains zinc, magnesium, Nickel, iron, zirconium and copper at the following component ratio, wt.%:
|Magnesium||1.7 to 2.3|
and the solidus temperature is not less than 570°C, the temperature of solvus not more than 410°C., and the hardness is not less than 150 HV.
The material may be in the form of castings (in particular, by casting in a single form)with the following properties tensile: tensile strength (σin) not m is it 450 MPa, the yield stress (σof 0.2) not less than 400 MPa, elongation (δ) - not less than 4%.
Furthermore, the material may be in the form of deformed semi-finished products (in particular, rolled sheets)with the following properties tensile: tensile strength (σin) not less than 500 MPa, the yield stress (σof 0.2) not less than 450 MPa, elongation (δ) of not less than 5%.
The invention consists in the following.
The presence of alloying elements in the claimed limits with regard to hardness allows you to provide the best combination of mechanical properties and processability. The stated limitation on the solidus temperature allows spheroidizing annealing at a sufficiently high temperature, generating a relatively globular particles of phases of Al9FeNi, which has a positive effect on plasticity. The stated temperature limits of solvus allows you to dissolve the zinc, magnesium and copper in the aluminum solid solution at relatively low temperatures, which facilitates the final (or re) heat treatment. This has a positive effect on the cost of treatment.
Were prepared ingots 6 alloys whose composition is shown in table 1. The alloys were prepared in an electric resistance furnace in gravitometric crucible of salaminia brand AE (99,5%), zinc brand C (99,9%), magnesium brand Mg (99,9%), copper mark M1 (99,9%) and ligatures Al-Ni, Al-Fe and Al-Zr. Determination of solidus temperatures (TSand solvus (TSS) was performed using the software Thermo-Calc database TTAL5). Under TSSwas taken the temperature of complete dissolution of zinc, magnesium and copper in the aluminum solid solution during heating. Ingots thermoablative on the treatment T6 (two-stage heating for hardening, quenching in cold water and aging). The Vickers hardness was determined according to GOST 2999-75 on universal hardness tester Wilson Wolpert 930. Calculated and experimental values are given in table 1.
From table 1 it is seen that only the claimed alloy (compounds 2-4) provides the required values of TS, TSSand HV. While the claimed alloy meets the required limit of Nickel concentrations (less than 0.8%). In alloy 1 hardness is much below the required level. In grades 5 and 6 the values of TSbelow the required level, and the values of TSSon the contrary, above.
|The compositions of the experimental alloys and their characteristics|
|Concentration in the alloy, wt.%||TS, °C||TSS, °C||HV|
|1the average composition of the alloy-prototype|
Alloys 3 and 5 (table 1) were obtained in the form of shaped castings by casting in a single form, which was produced by the method of rapid prototyping printer Z-cast. A separate part of the form was collected and sealed (figa). Castings of alloy 3 (figb) did not contain defects, and their microstr the established levels was characterized by relatively compact inclusions phase Al 9FeNi. Castings of alloy 5 was cracked, so the mechanical properties are not defined. After the heat treatment provides hardness specified in table 1, were determined by the mechanical properties of alloy 3 on cylindrical specimens cut from castings, GOST 1497-84. From table 2 it is seen that the alloy of the claimed composition in the castings obtained by casting in a single form, has the desired mechanical properties.
|The mechanical properties of the claimed alloy1in castings|
|σin, MPa||σof 0.2, MPa||δ,%|
|1part 3 (see table 1)|
Alloy 3, 5 and 6 (table 1) were obtained cold-rolled sheets according to the technology, which included the following basic operations:
- getting a flat ingot thickness of 20 mm;
- two-stage homogenization annealing the ingot;
hot rolling the homogenized ingot to a thickness of 2 mm;
intermediate annealing of hot-rolled sheet;
- cold rolling to a thickness of 0.45 and 0.17 mm (half the value of rolled sheets);
- hardening heat treatment of cold-rolled sheets (heating for hardening, quenching in cold water and aging).
In grades 5 and 6 in the cold rolling process formed cracks, so their mechanical properties were not determined. In sheet car alloy 3 cracks and other defects were not detected (figure 2).
After the heat treatment of cold-rolled sheet of alloy 3 was determined mechanical properties on flat samples cut from the sheets, according to GOST 1497-84.
From table 3 it is seen that the alloy of the claimed composition in the form of rolled sheets has the required mechanical properties.
|The mechanical properties of the claimed alloy1in sheets|
|Sheet thickness, mm||σin, MPa||σof 0.2, MPa||δ,%|
|1part 3 (see table 1)|
1. Alloy based on aluminium is Oia,
containing, zinc, magnesium, Nickel, iron, zirconium and copper, characterized in that it contains components in the following amounts, wt.%:
|Magnesium||1.7 to 2.3|
moreover, the alloy has a solidus temperature of not less than 570°C, the temperature of solvus not more than 410°C and the hardness is not less than 150 HV.
2. The alloy according to claim 1, characterized in that it is made in the form of castings and has after heat treatment regime T6 tensile strength (σin) not less than 450 MPa, the yield stress (σof 0.2) - not less than 400 MPa, elongation (δ) - not less than 4%.
3. The alloy according to claim 1, characterized in that it is made in the form of rolled sheets and has after quenching and aging tensile strength (σin) not less than 500 MPa, the yield stress (σof 0.2) not less than 450 MPa, elongation (δ) of not less than 5%.
SUBSTANCE: proposed composition contains the following substances, in wt %: zinc - 4-5, indium - 0.01-0.1, zirconium - 0.01-0.1, titanium - 0.02-0.1, aluminium and impurities making the rest. Content of impurities in the alloy of iron, silicon and copper may no exceed 0.1, 0.1 and 0.01, respectively, while that of hydrogen must no exceed 0.20 cm3/100 g Me.
EFFECT: higher efficiency and stability of electrochemical characteristics.
2 cl, 3 tbl
SUBSTANCE: invention may be used for making critical parts operated at high loads at 100-150°C, e.g, those of aircraft, cars and trucks, etc. Aluminium-based alloy comprises 7-12% of Zn, 2-5% of Ca, 2.2-3.8% of Mg, 0.02-0.25% of Zr. Note here that its hardness makes at least 150 HV, σB>450 MPa. σ0.2>400 MPa.
EFFECT: new high-strength alloy for thermal hardening, making shaped castings.
4 tbl, 3 ex, 2 dwg
SUBSTANCE: ingot, at least, 4in-thick, is made from aluminium-based alloy containing, at least, 6.5 wt % of zinc and magnesium at zinc-to-magnesium ratio of 5:1. Said ingot features, at quarter of thickness, the tensile strength of, at least, 61 kgft/sq.in and yield points of, at least, 54.5 kgft/sq.in. Proposed method comprises the following stages: 12 in-thick ingot is cast from aluminium-based alloy containing: 6-8 wt % of Zn, 1-2 wt % of Mg, with Mg content making (0.2 × Zn - 0.3) wt %-(0.2 × Zn + 0.3) wt %, at least, one element forming intermetallic dispersoids, aluminium and unavoidable impurities making the rest. Then, ingot is homogenised at 820°F to 980°F, and cooled by one of below methods: forced feed of air, water mist and water spray. Then, it is artificially aged at 240°F to 320°F to allow age-hardening.
EFFECT: high strength, low sensitivity to quenching.
12 cl, 8 dwg, 6 tbl, 2 ex
SUBSTANCE: invention relates to metallurgy of light alloys, particularly, to super strong heat-treatable aluminium alloys of Al-Zn-Mg-Cu system intended for making semis, i.e. formed and rolled tubes, stamped covers to be used as has centrifuge parts. Articles are made from alloy containing the following components in wt %: zinc 8.0-9.0, magnesium 2.3-3.0, copper 2.0-2.6, zirconium 0.1-0.2, beryllium 0.0001-0.002, cerium 0.005-0.05, calcium 0.005-0.05, titanium 0.005-0.05, iron up to 0.15, silicon up to 0.1, and at least of element of the group: manganese up to 0.1, aluminium making the rest.
EFFECT: higher strength, ductility, toughness, fatigue strength.
2 cl, 2 tbl, 1 ex
SUBSTANCE: plate from aluminium alloy consists of 6.8-8.5 wt % Zn, 1.75-2.3 wt % Cu, 1.5-1.84 wt % Mg and up to 0.25 wt % at least of one of Zr, Hf, Sc, Mn and V, and if necessary, additives crushing the grain, and the rest includes aluminium and inevitable impurities; at that, plate has the thickness of not more than 2.00 inches. Plate has the ratio between yield strength and failure viscosity, which meets the following equation: FT_LT ≥ -4.0* (TYS_L)+453. Plate has TYS_L that is at least 80 ksi and FT_LT that is at least 100 ksi√ inch, where TYS_L - tensile yield strength of the plate in direction L, in ksi, which is measured in compliance with ASTM E8 and ASTM B557, FT_LT - failure viscosity (Kapp) of the plate in flat stressed state in direction L-T, in ksi√inch, which is measured in compliance with ASTM E561 and B646 on specimen of aluminium alloy with central crack in position T/2 of the plate; at that, specimen has the width of 16 inches, thickness of 0.25 inches and initial length of preliminary fatigue crack of 4 inches.
EFFECT: plates are made from aluminium alloys having high failure viscosity at maintaining the acceptable strength level.
32 cl, 10 dwg, 10 tbl, 4 ex
FIELD: weapons and ammunition.
SUBSTANCE: method consists in obtaining the workpiece to be rolled and its heating, hot rolling of plate according to the size requirements, cooling down to room temperature and artificial ageing. Production of workpieces to be rolled involves rolling according to the size requirements of ingots and/or slabs from aluminium alloys for sandwich plate and assembly of a pack using them. Pack is heated at 500-550°C during 5-7 hours. Rolling according to the size requirements is performed at 410-450°C. Additional hardening is performed at 450-480°C. Artificial ageing is performed at temperature of 110-120°C during 24-36 hours.
EFFECT: improving armour properties and durability of sandwich plate.
5 cl, 1 tbl
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 15-30°C more than molten metal temperature, and vacuum treatment of molten metal in mixer is performed at temperature of 695-720°C, 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
SUBSTANCE: there proposed is aluminium-based alloy intended for manufacture of deformed semi-finished products in the form of sheets, formings, rods, tubes or in any other form to be used in gas centrifuges, low pressure compressors, vacuum molecular pumps and in other heavily loaded items operating at moderately increased temperatures. Alloy contains the following components, wt %: zinc 6.6-7.4, magnesium 3.2-4.0, copper 0.8-1.4, scandium 0.12-0.30, zirconium 0.06-0.20, titanium 0.01-0.07, molybdenum 0.01-0.07, nickel 0.35-0.65, iron 0.35-0.65, silcone 0.10-0.30, and aluminium is the rest.
EFFECT: improving strength properties of alloy at room temperature.
3 tbl, 1 ex
SUBSTANCE: aluminium-based cast alloy has the following chemical composition, in wt %: Cu 3.5-6.0, Mg 0.2-0.9, Ti 0.1-0.4, Zr 0.1-0.5, Mn 0.2-1.2, Zn 0.5-2.5, Sc 0.15-0.5, Al making the rest.
EFFECT: reduced metal consumption, higher reliability in operation.
SUBSTANCE: invention relates to alloy of AA7000 series and to the manufacturing method of products from this aluminium alloy, and namely to aluminium deformed products of relatively large thickness, namely of 30 to 300 mm. Method involves casting of workpiece - ingot of aluminium alloy of AA7000 series, which contains >0.12 to 0.35% Si, pre-heating and/or homogenisation of workpiece, hot deformation treatment of workpiece using one or more methods chosen from the group, which involves rolling, extrusion and forging, optionally cold deformation treatment, solution treatment, workpiece solution treatment cooling, optional tension or compression or other cold deformation treatment for release of stresses, which is performed by straightening or drawing or by cold rolling, ageing of workpiece in order to achieve the required state. At least one heat treatment is performed at temperature in the range of more than 500°C, but lower than solidus temperature of the considered aluminium alloy. The above heat treatment is performed either: (i) after heat treatment by homogenisation prior to hot deformation treatment, or (ii) after solution treatment, or (iii) both after heat treatment by homogenisation prior to hot deformation treatment, and after solution treatment.
EFFECT: obtaining the product from deformed aluminium alloy, which has improved balance of properties, and namely destruction viscosity, tensile yield point, tensile ultimate strength and relative elongation.
30 cl, 8 tbl, 3 ex
SUBSTANCE: aluminum based protective alloy comprises, in mass %, 4-5 of zinc, 0.01-0.06 of indium, 0.01-0.1 solder, 0.01-0.1 of zirconium, and aluminum the remainder.
EFFECT: enhanced corrosion protection.
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
FIELD: metallurgy of aluminum alloys; manufacture of wrought semi-finished products for transport engineering and other industries.
SUBSTANCE: proposed alloy includes the following components, mass-%: zinc, 3.6-4.1; magnesium, 0.6-1.1; manganese, 0.2-0.5; zirconium, 0.05-0.12; chromium, 0.05-0.15; copper, 0.1-0.2; titanium, 0.01-0.06; molybdenum, 0.01-0.06; the remainder being aluminum.
EFFECT: enhanced corrosion resistance and technological ductility of semi-finished items at plastic metal working.
2 tbl, 1 ex
SUBSTANCE: invention relates to aluminum-base material. Proposed material comprises the following components, wt.-%: zinc, 6-8; magnesium, 2.5-3.5; nickel, 0.6-1.4; iron, 0.4-1.0; silicon, 0.02-0.2; zirconium, 0.1-0.3; scandium, 0.05-0.2, and aluminum, the balance wherein the temperature of equilibrium solidus of material is 540°C, not less, the hardness value of material is 200 HV, not less. Invention provides the development of the novel high-strength material designated for both producing fashioned ingots and deformed semifinished product possessing high mechanical properties. Invention can be used in making articles working under effect of high loading, such as car articles and sport inventory articles.
EFFECT: improved and valuable properties of material.
4 cl, 2 dwg, 4 tbl, 3 ex
FIELD: nonferrous metallurgy.
SUBSTANCE: invention relates to ultrastrong economically alloyed aluminum-based alloys belonging to system Al-Zn-Mg-Cu. Alloy and article made therefrom are, in particular, composed of, %: zinc 3.5-4.85, copper 0.3-1.0, magnesium 1.2-2.2, manganese 0.15-0.6, chromium 0.01-0.3, iron 0.01-0.15, silicon 0.01-0.12, scandium 0.05-0.4, at least one element from group: zirconium 0.05-0.15, cerium 0.005-0.25, and aluminum - the rest.
EFFECT: increased characteristics of corrosion resistance, bondability with all welding techniques, and lowered fatigue crack growth rate.
2 cl, 2 tbl
SUBSTANCE: invention proposes alloy containing the following components, wt.-%: zinc, 5.4-6.2; magnesium, 2.51-3.0; manganese, 0.1-0.3; chrome, 0.12-0.25; titanium, 0.03-0.10; zirconium, 0.07-0.12; beryllium, 0.0002-0.005; sodium, 0.0001-0.0008; copper, 0.2, not above; iron, 0.3, not above; silicon, 0.2, not above, and aluminum, the balance. Alloy provides enhancing uniformity of armor structure and its welded seams, stable armor resistance of extended armor welded seams independently on disposition of units to bed welded, elimination of splits from armor rear site in case its resistance to a missile impact, elimination possibility for reducing tenacity of armor during its exploitation including using under conditions of combination with dynamic protection of armored-body and armor-carrying mechanized objects. Invention can be used in producing armor for individual protection and for protection of mechanized armor-carrying objects against effecting agents.
EFFECT: improved and valuable properties of alloy.
SUBSTANCE: invention proposes alloy comprising the following components, wt.-%: zinc, 4.7-5.3; magnesium, 2.1-2.6; chrome, 0.12-0.25; titanium, 0.03-0.10; zirconium, 0.07-0.12; beryllium, 0.0002-0.005; iron, 0.05-0.35; silicon, 0.05-0.25; boron, 0.0003-0.003; sodium, 0.0001-0.0008; copper, 0.2, not above, and aluminum, the balance. Proposed alloy provides enhancing the armor structure uniformity and its welded joints, to provide stable armor resistance of extended welded joints of armor and independently of location of units to be welded, to exclude splitting off from rear side of armor in case armor not piercing by a missile, to exclude possibility for decreasing tenacity of armor in exploitation including using under conditions of combination with external dynamic protection of armored-carcass and armored-carrying mechanized objects. Invention can be used in producing armor for armored-carrying equipment for protection against effect of affection agents.
EFFECT: improved and valuable technical properties of alloy.
SUBSTANCE: invention proposes alloy comprising the following components, wt.-%: zinc, 4.7-5.3; magnesium, 2.1-2.6; manganese, 0.05-0.15; chrome, 0.12-0.25; titanium, 0.03-0.10; zirconium, 0.07-0.12; beryllium, 0.0002-0.005; iron, 0.05-0.35; silicon, 0.05-0.25; sodium, 0.0001-0.0008; copper, 0.2, not above, and aluminum, the balance. Proposed alloy provides enhancing armor structure uniformity and its welded joins, to provides stable armor resistance of armor welded joints being independently on location of units to be welded, to exclude splitting off from rear side of armor in case armor not piercing by missile, to provide high tenacity of armor including its using under conditions of combination with external dynamic protection of armored-carcass and armor-carrying mechanized objects. Invention can be used in producing armor for armor-carrying equipment for its protection against protection of affecting agents.
EFFECT: improved and valuable properties of alloy.
SUBSTANCE: the present innovation deals with obtaining aluminum-based alloys necessary for manufacturing stampings, particularly those of automobile wheels disks. The alloy in question has got the following composition, weight%: copper 0.8-2.2; magnesium 1.2-2.6; manganese 0.2-0.6; iron ≤0.25; silicon ≤0.20; zinc 5.0-6.8; titanium ≤0.1; chromium 0.08-0.17; zirconium 0.01÷0.12; boron 0.0008-0.005; antimony 2.5-3.5; indium 2.5-3.5; boron 0.4-0.5; hydrogen (0.3-4.1)10-5, aluminum - the rest. The alloy in question is of optimal combination of strength and plasticity that guarantee the required level of performance characteristics of automobile wheels disks, the decrease of their weight in combination with high technological effectiveness at volumetric stamping, especially complex-shaped articles.
EFFECT: higher strength and plasticity of the alloy.
2 cl, 1 ex, 3 tbl
FIELD: metallurgy, alloys.
SUBSTANCE: invention relates to compositions of deformable aluminum-base alloys. Proposed alloy comprises the following components, wt.-%: zinc, 5.0-7.0; magnesium, 0.4-0.8; copper, 0.8-1.2; manganese, 0.8-1.2; zirconium, 0.2-0.3; titanium, 0.2-0.3; niobium, 0.2-0.3; nickel, 3.0-5.0; boron, 0.02-0.03, and aluminum, the balance. Proposed alloy possesses the enhanced strength. Proposed alloys can be used in aircraft construction and automobile construction.
EFFECT: improved and valuable property of alloy.