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The Raw Materials Initiative of the European Union (EU), which aims to "boost overall resource efficiency and promote recycling to reduce the EU's consumption of primary raw materials and decrease the relative import dependence", is currently implemented on the national and industry levels. This paper discusses the interpretation of the different indicators used to evaluate the resource efficiency of materials using the example of aluminium. Aluminium is used mainly in long-life applications, like building, transport and engineering, with only packaging materials having a short lifespan. One inventory in use states that about 700 Mt has been accumulated, accounting for 75% of the primary metal ever produced. This metal stock is the future source of raw material and energy in which we have invested. In 2010 about 50 Mt of aluminium entered the use phase as finished products. In the same year 11 Mt of end-of-life scrap was collected for recycling. In other words, less than a quarter of the current aluminium demand is covered by scrap from used products. It becomes problematical if this statistical indicator is used as a criterion for recycling performance. The recycled content of aluminium products is not low because of inefficient recycling but because of increasing demand for long-life products, driven by the need for the unique metallic properties of the lightweight metal. Consequently, growth in demand and an increasing lifespan determine the share of recycled metal in the global production of aluminium. Additionally, trade in scrap and products influence the regional results. © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.


The invention relates to a method for thermally treating an aluminium workpiece, comprising the steps of providing an aluminium workpiece, which is essentially in the T4 structural state, and exposing a first portion of the workpiece to a first precipitation hardening process by artificial ageing to change the structural state of the first portion of the workpiece, wherein a part of the workpiece is actively cooled during the first precipitation hardening process, so that a second portion of the workpiece essentially remains in the same structural state during the first precipitation hardening process. The invention further relates to an apparatus for thermally treating an aluminium workpiece and to an aluminium workpiece, especially producible with a method according to the invention.


Patent
Hydro Aluminium | Date: 2015-02-09

The invention relates to an aluminium alloy, the use of an aluminium alloy strip or sheet and a method for producing an aluminium alloy strip or sheet. An aluminium alloy which has only a slight tendency towards intercrystalline corrosion and which at the same time provides high levels of strength and good deformability and which contains standard alloy components so that the recycling of the aluminium alloy is simplified is provided herein.


The invention relates to a cold-rolled aluminium alloy strip made of an AlMg aluminium alloy as well as a method for producing the same. Furthermore, corresponding components made from said aluminium alloy strips are also proposed. The problem for the invention of providing a single-layer aluminium alloy strip that is sufficiently resistant to intercrystalline corrosion and is nevertheless very formable so that even large-area deep-drawn parts, e.g. interior parts of motor vehicle doors, can be made with sufficient strength, is solved by an aluminium alloy strip made of an AlMg aluminium alloy as described herein.


The invention relates to an aluminium alloy strip composed of an AA 5xxx-type aluminium alloy containing at least 4 wt. % of Mg in addition to Al and inevitable impurities. The object of the invention of proposing an aluminium alloy strip in an AlMg aluminium alloy strip which is resistant to intercrystalline corrosion despite having high strength and an Mg content of at least 4 wt. %, is achieved according to a first teaching of the present invention by an aluminium alloy strip that has a recrystallized microstructure, the grain size (GS) of which in m has the following relation to the Mg content (c_Mg) in wt. %: GS22+2*c_Mg, and wherein the aluminium alloy of the aluminium alloy strip has the composition described herein.


Patent
Hydro Aluminium | Date: 2015-10-30

The invention relates to a method for producing a strip made of an AlMgSi alloy in which a rolling ingot is cast of an AlMgSi alloy, the rolling ingot is subjected to homogenization, the rolling ingot which has been brought to rolling temperature is hot-rolled, and then is optionally cold-rolled to the final thickness thereof. The problem of providing a method for producing an aluminum strip made of an AlMgSi alloy and an aluminum strip, which has a higher breaking elongation with constant strength and therefore enables higher degrees of deformation in producing structured metal sheets, is solved in that the hot strip has a temperature of no more than 130 C. directly at the exit of the last rolling pass, preferably a temperature of no more than 100 C., and the hot strip is coiled at that or a lower temperature.


A method for producing a roll-clad aluminium workpiece and an associated roll-clad aluminium workpiece are provided, wherein a core ingot is produced from an aluminium alloy and at least one cladding piece is produced from a cladding material, wherein at least one groove is introduced into the core ingot and/or into a layer applied to the core ingot, wherein the cladding piece is inserted into the groove, and wherein the core ingot is hot-rolled after the cladding piece has been inserted, the width of the groove being equal to or less than the core ingot width. A use of such a roll-clad aluminium workpiece is also provided for producing a soldered workpiece, in particular a folding tube.


An aluminium alloy for the manufacture of semi-finished products or components of motor vehicles, a method for the manufacture of a strip made of an aluminium alloy according to the invention, a corresponding aluminium alloy strip or sheet as well as a structural component of a motor vehicle consisting of an aluminium alloy sheet which includes the following alloy components in % by weight: 0.6%Si0.9%, 0.6%Fe1.0%, Cu0.1%, 0.6%Mn0.9%, 0.5%Mg0.8%, Cr0.05%, the remainder Al and impurities, individually up to a maximum of 0.05% by weight, in total up to a maximum of 0.15% by weight.


The invention relates to an aluminium alloy strip composed of an AA 5xxx-type aluminium alloy containing at least 4 wt. % of Mg in addition to Al and inevitable impurities. The object of the invention of proposing an aluminium alloy strip in an AlMg aluminium alloy strip which is resistant to intercrystalline corrosion despite having high strength and an Mg content of at least 4 wt. %, is achieved according to a first teaching of the present invention by an aluminium alloy strip that has a recrystallized microstructure, the grain size (GS) of which in m has the following relation to the Mg content (c_Mg) in wt. %: GS22+2*c_Mg, and wherein the aluminium alloy of the aluminium alloy strip has the composition described herein.


Patent
Hydro Aluminium | Date: 2016-06-09

Use of an aluminium composite material in a thermal joining method, said material consisting of at least one aluminium core alloy and at least one external brazing layer consisting of an aluminium brazing alloy provided on one or both sides of the aluminium core alloy, wherein the aluminium brazing layer has a pickled surface. Reduced costs and a lower environmental impact is achieved by using an aluminium composite material in which the pickled surface of the aluminium brazing layer had been pickled by pickling with an acid, aqueous pickling solution containing at least one mineral acid and at least one complex-forming agent or a complexing mineral acid, wherein the removal of material in the pickling is between 0.05 g/m^(2 )and 6 g/m^(2), the aluminium composite material is used in a flux-free, thermal joining method, and the joining method is carried out in the presence of a protective gas.

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