Editor’s Note: Although the Aluminum Association has certified hundreds of international aluminum alloys in each of the wrought and cast categories, aluminum metallurgists keep adding new recipes to meet the challenges required in their products, which span a range of applications—transportation, B&C, packaging, and various industrial and consumer products. The focused patent search presented hereafter reviews some of the recent inventions that aluminum metallurgists and engineers have developed in creating aluminum alloy compositions that provide special product properties for their intended applications at ambient and high and low temperatures.
Several of these patents aim to improve processability as well as properties of automotive heat exchangers made of special aluminum alloy compositions, e.g., tubing extrusion, foil production, brazeability, and corrosion resistance. Others include alloy compositions that aim to improve the performance of automotive die castings and wrought parts at high temperatures and under wear conditions. Some of the compositions cited are used in the manufacture of cryogenic pumps from aluminum alloys having high strength and elongation at cryogenic temperature. Aerospace related patents noted here involve a new Al-Li alloy and a dispersion strengthened aluminum alloy.
All these patents include methods of producing novel aluminum alloy compositions to meet challenging application requirements in a productive process chain. This involves alloying practices as well as downstream processing to produce quality products, including casting, homogenization, extrudability, quenching, and aging (if the alloy is heat treatable) as well as additional final processing (such as anodizing, machining, joining, etc.), if applicable to the intended application.
Aside from primary aluminum alloying practices that use master alloys or pure elements to alloy primary grade aluminum, most common casthouse practices involve some or even a major portion of secondary aluminum additions and require special consideration when alloying, as has been done in creating many of the new and innovative aluminum alloys presented here. For more information on common casthouse practices, interested readers can search the international patents presented in the August 2020 issue of LMA, which focused on aluminum remelting and casthouse strategies.
– Joseph C. Benedyk, Editor
US10669616 — ALUMINUM ALLOY COMPOSITION AND METHOD — Rio Tinto Alcan International Limited (Canada) — An aluminum alloy composition includes, in weight percent: 0.7-1.10 manganese; 0.05-0.25 iron; 0.21-0.30 silicon; 0.005-0.020 nickel; 0.10-0.20 titanium; 0.014 max copper; and 0.05 max zinc, with the balance being aluminum and unavoidable impurities. The alloy may tolerate higher nickel contents than existing alloys, while providing increased corrosion resistance, as well as similar extrudability, strength, and performance. Billets of the alloy may be homogenized at 590-640°C and controlled cooled at less than 250°C per hour. The homogenized billet may be extruded into a product, such as a corrosion resistant aluminum alloy heat exchanger tube.
US10655635 — ALUMINUM AIRFOIL — United Technologies Corporation (USA) — An airfoil includes a first airfoil piece and a second airfoil piece bonded to the first airfoil piece at a joint. The first airfoil piece and the second airfoil piece are formed of aluminum alloys. At least one of the aluminum alloys is an aluminum alloy composition that has greater than 0.8% by weight of zinc.
US10634439 — ALUMINUM ALLOY BRAZING SHEET FOR A HEAT EXCHANGER, AND PROCESS FOR PRODUCING THE SAME — UACJ Corporation (Japan) — Provided are an aluminum alloy brazing sheet for heat exchangers, which exhibits excellent formability and brazeability, and an advantageous process for producing the same. The aluminum alloy brazing sheet for heat exchangers according to the present invention is configured such that: the aluminum alloy composition of a core material and the aluminum alloy composition and temper of a filler material are respectively controlled; and a core material portion of the brazing sheet has a specific electric resistivity at room temperature and a specific dispersion ratio of second phase particles. The brazing sheet is configured to further exhibit certain properties in terms of a work hardening exponent (n-value) where a nominal strain is within a range of 1%-2% and in terms of a push-in depth when a penetration crack is generated in a punch stretch forming test using a round-head punch having a diameter of 50 mm.
US10557188 — ALUMINUM ALLOY COMPOSITION AND METHOD — Rio Tinto Alcan International Limited (Canada) — The invention relates generally to an aluminum alloy composition and methods of manufacturing and/or homogenizing that can be used with the composition, and more specifically, to an Al-Mn-Si-Ti alloy composition with good corrosion resistance and extrudability, as well as tolerance to increased Ni impurity levels. An aluminum alloy composition includes, in weight percent: 0.5-0.7 manganese; 0.05-0.15 iron; 0.3-0.5 silicon; 0.020 max nickel; 0.05-0.15 titanium; 0.01 max copper; and 0.10 max zinc, with the balance being aluminum and unavoidable impurities. The alloy may also have a combined amount of manganese and silicon of at least 0.8 wt. % and/or a Mn/Si ratio of 2.25 or less. The alloy may tolerate higher nickel contents than existing alloys, while providing increased corrosion resistance, as well as similar extrudability, strength, and performance. Billets or other intermediate products formed of the alloy may be homogenized at 500-595°C and controlled cooled at 400°C per hour or less. The homogenized billet may be extruded into an extruded product, such as an aluminum alloy heat exchanger tube.
US10392684 — METHOD FOR THE PRODUCTION OF AN ANODIZED, TURNED MECHANICAL PART MADE FROM 6XXX ALLOY AND HAVING LOW ROUGHNESS AFTER ANODIZATION — Constellium Extrusion Decin S.R.O. (Czechoslovakia) — The invention relates to a method for the production of a mechanical part, comprising the following successive steps: casting of a billet of aluminum alloy with a composition (in weight %) of 0.4-3.0 Si; 0.6-2.0 Mg; 0.20-1.0 Cu; 0.15-1.8 Fe; Mn<0.5; Ni<1; Ti<0.15; Cr<0.35; Bi<0.8; Pb<0.4; Zr<0.04; other elements <0.05 each and <0.15 total, the remainder being aluminum; homogenization of the billet; extrusion of the billet in order to obtain an extruded product; quenching while at extrusion heat; optional cold-deformation and/or straightening, typically by means of pulling and/or drawing, and/or curing of the extruded product; tempering; optional cold-deformation of the extruded product, typically by drawing; machining of the resulting extruded product in order to obtain a turned mechanical part; optional shaping of the resulting mechanical part; anodizing of the resulting mechanical part at a temperature of between 15 and 40°C with a solution comprising between 100 and 250 g/l sulfuric acid and between 10 and 30 g/l oxalic acid and between 5 and 30 g/l of at least one polyol. The anodized turned mechanical parts obtained using the method of the invention have, in particular, advantageous roughness and excellent corrosion resistance and can be used, particularly, as brake pistons or gearbox elements.
US10386134 — HEAT TRANSFER TUBE AND METHOD FOR PRODUCING SAME — Mitsubishi Aluminum Co., Ltd. (Japan) — A heat transfer tube includes: a tube body made of an extruded material of an aluminum alloy having a composition including: 0.3 mass % or more and less than 0.8 mass % of Mn; more than 0.1 mass % and less than 0.32 mass % of Si; 0.3 mass % or less of Fe; 0.06 mass % or more and 0.3 mass % or less of Ti; and Al balance including inevitable impurities, a ratio of a Mn content to a Si content, Mn %/Si %, exceeding 2.5; and a Zn-containing layer provided to an outer surface of the tube body. In the heat transfer tube, the Zn-containing flux layer may be: a Zn layer, a Zn-containing flux layer; or a layer including a mixture of a Zn-containing flux, a brazing filler, and/or a binder. In the heat transfer tube, the body of the tube may have a flat tube shape with multiple holes including multiple passage of fluid. In the heat transfer tube, the aluminum alloy may further include: 0.5 mass % or less of Cu; less than 0.05 mass % of Mg; and less than 0.03 mass % of Cr.
US10260136 — ALUMINUM ALLOY FOR DIE CASTING AND METHOD OF HEAT TREATING THE SAME — Hyundai Motor Company (Korea) — Disclosed are an aluminum alloy composition for die casting and a method of heat treating the same. The aluminum alloy composition contains precipitation of an Mg–Zn-based strengthening phase through heat treatment to thus enhance strength thereof. In one aspect of the present invention, provided is an aluminum alloy composition for die casting. The aluminum alloy composition may comprise: silicon (Si) in an amount of about 9.6 to 12.0 wt. %; magnesium (Mg) in an amount of about 1.5 to 3.0 wt. %; zinc (Zn) in an amount of about 3.0 to 6.0 wt. %; iron (Fe) in an amount of about 1.3 wt. % or less but greater than 0 wt. %; manganese (Mn) in an amount of about 0.5 wt. % or less but greater than 0 wt. %; nickel (Ni) in an amount of about 0.5 wt. % or less but greater than 0 wt. %; tin (Sn) in an amount of about 0.2 wt. % or less but greater than 0 wt. %; and aluminum (Al) constituting the remaining balance of the aluminum alloy composition. Unless otherwise indicated herein, all the wt. % are based on the total weight of the aluminum alloy composition. The aluminum alloy may further include copper (Cu) in an amount of about 0.3 wt. % or less and titanium (Ti) in an amount of about 0.3 wt. % or less, based on the total weight of the alloy composition. Preferably, the sum of amounts of Mg and Zn may be of about 6 to 8 wt. %, based on the total weight of the aluminum alloy composition. Preferably, the aluminum alloy composition may have a ratio of Mg/Zn ratio about 2.0 or greater.
US10220418 — METHOD AND SYSTEM FOR RECYCLING ALUMINUM ALLOY RIMS USING SPECTROGRAPHIC ANALYSIS — House of Metals Company Limited (Canada) — A method and system of recycling aluminum alloy rims from vehicles, the method and system comprising providing a feed of a plurality of aluminum alloy rims of different alloys, for each rim in the feed of aluminum alloy rims, determining a composition of that aluminum alloy rim, determining a plurality of recycled aluminum alloy composition ranges, and dividing the feed of aluminum alloy rims into a plurality of batches of aluminum alloy rims, each batch of aluminum alloy rims in the plurality of batches of aluminum alloy rims corresponding to an associated recycled aluminum alloy composition range in the plurality of recycled aluminum composition ranges, such that each rim in the plurality of aluminum alloy rims is allocated to an associated batch in the plurality of batches of aluminum alloy rims based on the composition of that aluminum alloy rim.
US9982328 — CASTING MADE FROM ALUMINIUM ALLOY, HAVING HIGH HOT CREEP AND FATIGUE RESISTANCE — Rio Tinto Alcan International Limited (Canada) — The subject of the invention is a cast part with high mechanical resistance and hot creep strength, in particular around 300°C or even above, combined with a high yield strength at ambient temperature and high low cycle and high cycle mechanical fatigue strength, and with good ductility from ambient temperature up to 300°C, made of aluminum alloy of chemical composition, expressed in percentages by weight: Si: 3-11%, preferably 5.0-9.0% Fe<0.50%, preferably <0.30%, preferably still <0.19% or even 0.12% Cu: 2.0-5.0%, preferably 2.5-4.2%, preferably still 3.0-4.0% Mn: 0.05-0.50%, preferably 0.08-0.20% Mg: 0.10-0.25%, preferably 0.10-0.20% Zn: <0.30%, preferably <0.10% Ni: <0.30%, preferably <0.10% V: 0.05-0.19%, preferably 0.08-0.19%, preferably still 0.10-0.19% Zr: 0.05-0.25%, preferably 0.08-0.20% Ti: 0.01-0.25%, preferably 0.05-0.20% other elements <0.05% each and 0.15% in total, the rest aluminum. It more particularly relates to cylinder heads for supercharged diesel or petrol internal combustion engines.
US9885995 — ALUMINUM ALLOY AND PROCESS FOR PRODUCING ALUMINUM ALLOY EXTRUSIONS — Showa Denko K.K. (Japan) — The present invention relates to an aluminum alloy, a production method of an aluminum alloy extruded member, a production method of a photoconductor drum substrate, an aluminum alloy extruded member, and a photoconductor drum substrate. An outer surface of an aluminum alloy tube used for the substrate is required to have a high surface smoothness so that a photosensitive layer having a uniform thickness can be applied thereon. In recent years, a non-machined tube, such as a drawn tube obtained by drawing an aluminum alloy extruded tube, an ironed tube obtained by ironing an aluminum alloy extruded tube, etc., has come into use. In such a non-machined tube, the surface quality of the outer surface is largely affected not only by the processing accuracy of the drawing process or the ironing process as a final process but also by the surface quality of the outer surface of the extruded tube and, in order to assuredly make the outer surface of the non-machined tube into a high smooth surface, it is required to improve the surface quality of the outer surface of the extruded tube. An aluminum alloy for this purpose has a composition consisting of Si: 0.03 to 0.6 mass %, Fe: 0.1 to 0.7 mass %, Cu: 0.05 to 0.20 mass %, Mn: 1.0 to 1.5 mass %, Mg: 0.01 to 0.1 mass %, Zn: 0 to 0.1 mass %, Ti: 0 to 0.1 mass %, and the balance being Al and inevitable impurities.
US9857128 — HEAT TRANSFER TUBE AND METHOD FOR PRODUCING SAME — Mitsubishi Aluminum Co., Ltd. (Japan) — An extruded heat transfer tube with the body of the tube having a flat tube shape with multiple holes including multiple passage of fluid.an internal passage made of an extruded material of an aluminum alloy having a composition that includes 0.3 mass % or more and less than 0.8 mass % of Mn; more than 0.1 mass % and less than 0.32 mass % of Si; 0.3 mass % or less of Fe; 0.06 mass % or more and 0.3 mass % or less of Ti; and Al balance including inevitable impurities, a ratio of a Mn content to a Si content, Mn %/Si %, exceeding 2.5. The extruded heat transfer tube further includes a Zn-containing layer provided directly on an outer surface of the tube body and has excellent corrosion resistance.
US9828033 — METHOD FOR PRODUCING A VEHICLE COMPONENT, AND VEHICLE COMPONENT — Aleris Rolled Products Germany GMBH (Germany) — Method for producing a vehicle component, in particular a motor vehicle component, in particular a B-pillar, including providing a first aluminum alloy and a second aluminum alloy. The second alloy composition substantially matches the first aluminum alloy composition. Performing a heat-treatment of the first alloy to increase the ductility of the first alloy. Performing a heat-treatment of the second alloy. The heat-treatment of the first alloy differing from the heat-treatment of the second alloy. Welding together the heat-treated first alloy and the heat-treated second alloy by friction stir or laser welding to obtain a composite part. Shaping the composite parts into a motor vehicle component. The motor vehicle component sub-region of the first alloy can be designed as a predetermined deformation region when a force is applied due to an accident to achieve a good combination of rigid regions for example forming a safety cell, and deformable regions forming a crumple zone for absorbing energy.
US9783871 — METHOD OF PRODUCING ALUMINIUM ALLOYS CONTAINING LITHIUM — Aleris Rolled Products Germany GMBH (Germany) — A method of producing molten aluminum-lithium alloys for casting a feedstock in the form of an ingot, the method including the steps of: preparing a molten first aluminum alloy with a composition A which is free from lithium as purposive alloying element, transferring the first aluminum alloy to an induction melting furnace, adding lithium to the first aluminum alloy in the induction melting furnace to obtain a molten second aluminum alloy with a composition B having lithium as purposive alloying element, optionally adding further alloying elements to the second aluminum alloy, transferring the second alloy via a metal conveying trough from the induction melting furnace to a casting station.
US9631879 — ALUMINUM ALLOY FOR EXTRUSION AND DRAWING PROCESSES — Rio Tinto Alcan International Limited (Canada) — An extrudable aluminum alloy composition includes, in weight percent, between 0.60 and 0.90 manganese, between 0.45 and 0.75 copper, between 0.05 and 0.24 magnesium, less than 0.30 iron, less than 0.30 silicon, less than 0.05 titanium, less than 0.05 vanadium, and a Cu/Mg ratio higher or equal to 3. It also relates to aluminum alloy heat exchanger extruded or drawn tube and extruded or drawn aluminum alloy tubing having the above-described aluminum alloy composition. It also relates to a heat exchanger comprising a plurality of extruded or drawn tube sections having the above-described aluminum alloy composition and a process for manufacturing same.
US9267189 — METHODS FOR FORMING DISPERSION-STRENGTHENED ALUMINUM ALLOYS — Honeywell International Inc. (USA) — In accordance with an exemplary embodiment, a method of forming a dispersion-strengthened aluminum alloy metal useful in aerospace applications includes the steps of providing a dispersion-strengthened aluminum alloy composition in a powdered form, directing a low energy density laser beam at a portion of the powdered alloy composition, and withdrawing the laser beam from the portion of the powdered alloy composition. After withdrawal of the laser beam, the portion of the powdered alloy composition cools at a rate greater than or equal to about 10 6 °C per second, thereby forming the dispersion-strengthened aluminum alloy metal. The alloys used in this disclosure are preferably based on Al-Fe-V-Si. In one particular embodiment, the dispersoid may be a fine, nearly spherical phase with a composition approximating Al 12(Fe,V) 3Si. This silicide dispersoid may make up from 5 to 45 volume-% of the alloy, preferably from 15 to 40 volume-%. This gives a range of alloy compositions all having a [Fe+V]:Si ratio within the range 2:1 to 5:1. These Al-Fe-V-Si alloys may contain from 0.02 to 0.5 at % of a fifth element, which may be Mn, Mo, W, Cr, Ta, Zr, Ce, Er, Sc, Nd, Yb, or Y.
US9233414 — ALUMINUM AIRFOIL — United Technologies Corporation (USA) — A method of making an aluminum airfoil includes brazing a first airfoil piece and a second airfoil piece together using a braze material that includes an element selected from magnesium and zinc, to form a braze joint between the first airfoil piece and the second airfoil piece. At least one of the first airfoil piece or the second airfoil piece has an aluminum alloy composition that includes greater than 0.8% by weight of zinc. In a further non-limiting embodiment of any of the foregoing embodiments, the aluminum alloy composition includes greater than 4% by weight of the zinc. A further non-limiting embodiment of any of the foregoing embodiments includes a hollow cavity between the first airfoil piece the second airfoil piece.
US9222151 — ALUMINUM ALLOY EXCELLENT IN HIGH TEMPERATURE STRENGTH AND HEAT CONDUCTIVITY AND METHOD OF PRODUCTION OF SAME — Nippon Light Metal Company, Ltd. (Japan) — The present invention relates to an aluminum alloy which is used for automobile pistons etc. and is excellent in high temperature strength and heat conductivity and to a method of production of the same. An aluminum alloy which is excellent in high temperature strength and heat conductivity by adjusting the composition to one keeping down the drop in high temperature strength and making the Mn content as small as possible to reduce the formation of a solid solution in the aluminum, which aluminum alloy having a composition of ingredients which contains Si: 12 to 16 mass %, N: 0.1 to 2.5 mass %, Cu: 3 to 5 mass %, Mg: 0.3 to 1.2 mass %, Fe: 0.3 to 1.5 mass %, and P: 0.004 to 0.02 mass % and furthermore 0 to 0.1 mass % of Mn and further contains, as necessary, at least one of V: 0.01 to 0.1 mass %, Zr: 0.01 to 0.6 mass %, Cr: 0.01 to 0.2 mass %, and Ti: 0.01 to 0.2 mass %. Also described is a method for producing the aluminum alloy melt. According to need, when casting, the aluminum alloy melt is treated ultrasonically at a temperature of the liquidus line or more. Due to this, it is possible to promote nucleation and make the structure finer and possible to improve the room temperature characteristics of the aluminum alloy. The aim is to secure room temperature elongation and thereby prevent cracking at the time of working. Furthermore, this promotes precipitation and results in the amount in solid solution being reduced and the heat conductivity being improved by that amount.
US9187816 — METHODS OF RESIZING HOLES — General Electric Company (USA) — The present invention generally relates to methods for modifying the cross-sectional area of a hole. More particularly, this invention relates to a coating process that can be controlled to selectively resize a hole, a nonlimiting example being a premix fuel supply hole of a fuel nozzle assembly of a gas turbine. Methods of reducing an initial cross-sectional area of a hole in a component to a predetermined cross-sectional area including preparing a composition comprising at least an aluminum alloy with a melting temperature higher than aluminum, e.g., a Cr-Al alloy, applying the composition to an interior surface of the hole, and then heating the component to cause a metal within the component to diffuse from the component into the composition and react with the aluminum alloy in the composition to form a coating on the interior surface of the hole. The heating step is performed to selectively modify the initial cross-sectional area of the hole and thereby directly attain the predetermined cross-sectional area thereof.
US8771838 — SLIDING BEARING ELEMENT COMPRISING A LEAD-FREE ALUMINUM BEARING METAL LAYER — Federal-Mogul Wiesbaden GmbH (Germany) — The invention relates to a sliding bearing element comprising a supporting layer, an aluminum alloy-based intermediate layer, and an aluminum alloy-based bearing metal layer. The aluminum alloy composition of the intermediate layer includes at least the following components in percent by weight: 3.5 to 4.5 of copper; 0.1 to 1.5% of manganese; 0.1 to 1.5% of magnesium; and 0.1 to 1.0% of silicon. An object of the invention is to improve the laminate having a bearing metal layer and an intermediate layer, both based on an aluminum alloy, and the steel support layer to largely avoid plastic material deformation in use.
US8749954 — ELECTRODE FOIL AND CAPACITOR USING SAME — Panasonic Corporation (Japan) — The present invention relates to electrode foil and a capacitor with improved capacitance using the same. Examples of capacitors include a solid electrolytic capacitor having low ESR (equivalent series resistance) used in a periphery of a CPU (central processing unit) of a personal computer, an aluminum electrolytic capacitor used for smoothing a power supply circuit, and the like. These capacitors have been strongly demanded to have a smaller size and larger capacity. Electrode foil includes an aluminum alloy having a composition in a region at least 10 µm deep from a surface of the foil. The composition includes aluminum as a main component and zirconium of at least 0.03 at % and at most 0.5 at %.
US8636855 — METHODS OF ENHANCING MECHANICAL PROPERTIES OF ALUMINUM ALLOY HIGH PRESSURE DIE CASTINGS — GM Global Technology Operations LLC (USA) — Methods of enhancing mechanical properties of aluminum alloy high pressure die castings are disclosed herein. An aluminum alloy composition forming a casting comprises, by weight of the composition, at least one of a magnesium concentration greater than about 0.2%, a copper concentration greater than about 1.5%, a silicon concentration greater than about 0.5%, and a zinc concentration greater than about 0.3%. After solidification, a casting is cooled to a quenching temperature between about 300°C and about 500°C. Upon attainment of the quenching temperature, the casting is removed from the die and immediately quenched in a quench media. Following quenching, the casting is pre-aged at a reduced temperature between about room temperature and about 100°C. Thereafter, the casting is aged via at least one substantially isothermal aging at one or more elevated temperatures between about 150°C and about 240°C.
US8025748 — Al-Mn BASED ALUMINUM ALLOY COMPOSITION COMBINED WITH A HOMOGENIZATION TREATMENT — Rio Tinto Alcan International Limited (Canada) — The invention relates to an aluminum-manganese (Al-Mn) based alloy composition and, more particularly, it relates to an Al-Mn based alloy composition combined with a homogenization treatment for extruded and brazed heat exchanger tubing. An extrudable aluminum alloy billet includes an aluminum alloy composition including, in weight percent, between 0.90 and 1.30 manganese, between 0.05 and 0.25 iron, between 0.05 and 0.25 silicon, between 0.01 and 0.02 titanium, less than 0.01 copper, less than 0.01 nickel, and less than 0.05 magnesium, the aluminum alloy billet being homogenized at a temperature ranging between 550 and 600°C.
US7255756 — ALUMINUM ALLOY WITH IMPROVED MECHANICAL PROPERTIES AT HIGH TEMPERATURES — National Cheng Kung University (Taiwan) — In view of the increasing need of developing lightweight vehicles, applications of aluminum alloys have been extended to include environments with high temperatures. For example, they may be used to form engine blocks, engine cylinder liners, compressor pistons, disc brakes, etc. Therefore, it has become a very important subject in the light-metal industry to develop aluminum alloys with excellent mechanical properties at high temperatures. In view of the aforesaid, it is highly desired to develop aluminum alloys that can be formed without precipitation hardening treatment and that exhibit improved mechanical properties at high temperatures, including excellent wear resistance, hardness, and thermal stability. Disclosed herein is an aluminum alloy composition consisting essentially of, on the basis of total weight of the composition, 13 to 28 wt. % of silicon, 1.5 to 5 wt. % of a metal element selected from iron and manganese, 3 to 10 wt. % of zinc, 0.5 to 1 wt. % of magnesium, and aluminum as balance. Also disclosed herein is an aluminum alloy product made from said aluminum alloy composition and exhibiting improved mechanical properties at high temperatures, including excellent wear resistance, hardness, and thermal stability. According to this Invention, the aluminum alloy product may be formed by various solidification processes commonly used in the art for the manufacture of alloys, including, but not limited to, spray forming process, gravity casting, die casting, permanent mold casting, and squeeze casting.
US7172664 — METHOD OF MAKING ALUMINUM FOIL FOR FINS — Novelis, Inc. (Canada) — A method is described for making an aluminum alloy foil suitable for application to fins used in heat exchangers. The method comprises providing an aluminum alloy composition containing about 0.27% to about 0.55% by weight of iron, about 0.06% to about 0.55% by weight of silicon and optionally up to about 0.20% by weight of copper; continuously casting a coiled strip from the molten aluminum alloy; cold rolling the continuously cast coil to a final gauge of about 0.076 mm to about 0.152 mm and partially annealing the aluminum alloy sheet at a temperature below about 260°C, with a maximum overheat of about 10°C to anneal the aluminum alloy foil substantially without any recrystallization.
US7060139 — HIGH STRENGTH ALUMINUM ALLOY COMPOSITION — UES, Inc. (USA) — The present invention provides a high strength aluminum alloy composition and applications of the high strength aluminum alloy composition for the manufacture of cryogenic pumps. The alloy composition exhibits high tensile strength at ambient temperatures and cryogenic temperatures. The alloy composition can exhibit high tensile strength while maintaining a high elongation in ambient temperatures and cryogenic temperatures. An aluminum based alloy composition comprising: between about 6.0% by wt. and about 12.0% by wt. of zinc; between about 2.0% by wt. and about 3.5% by wt. of magnesium; between about 0.1% by wt. and about 0.5% by wt. of scandium; between about 0.05% by wt. and about 0.20% by wt. of zirconium; between about 0.5% by wt. and about 3.0% by wt. of copper; between about 0.10% by wt. and about 0.45% by wt. of manganese; between about 0.08% by wt. and about 0.35% by wt. of iron; between about 0.07% by wt. and about 0.20% by wt. of silicon; and aluminum, wherein said aluminum alloy has a tensile strength of at least 790 MPa with an elongation of at least 6% at a cryogenic temperature of about -196°C.
US7048815 — METHOD OF MAKING A HIGH STRENGTH ALUMINUM ALLOY COMPOSITION — UES, Inc. (USA) — The present invention provides a method of making a high strength aluminum alloy composition. The alloy composition exhibits high tensile strength at ambient temperatures and cryogenic temperatures. In one embodiment of the present invention an aluminum alloy composition is provided comprising between about 6.0% by wt. and about 12.0% by wt. of zinc, between about 2.0% by wt. and about 3.5% by wt. of magnesium, between about 0.01% by wt. and about 0.5% by wt. of scandium, between about 0.05% by wt. and about 0.20% by wt. of zirconium, between about 0.5% by wt. and about 3.0% by wt. of copper, between about 0.10% by wt. and about 0.45% by wt. of manganese, between about 0.02% by wt. and about 0.35% by wt. of iron, between about 0.02% by wt. and about 0.20% by wt. of silicon, between about 0.00% by wt. and about 0.05% by wt. of titanium, between about 0.00% by wt. and about 0.25% by wt. of chromium, between about 0.00% by wt. and about 0.05% by wt. of vanadium, between about 0.00% by wt. and about 0.25% by wt. of hafnium, between about 0.00% by wt. and about 0.20% by wt. of cerium, between about 0.00% by wt. and about 0.20% by wt. of nickel, between about 0.00% by wt. and about 0.20% by wt. of silver, and aluminum. The aluminum alloy composition has a tensile strength of at least 900 MPa at room temperature and at cryogenic temperature for use in the manufacture of cryogenic pumps.