Rio Tinto Alcan International Limited

Alcan International Limited

UniversitÉ Du QuÉbec A Chicoutimi

Nicholas Charles Parson

Alexandre Maltais

Raynald Guay

Thiagarajan Ramanan

Pierre Henri Marois

Paul W Jeffrey

Graeme John Marshall

Jean-Alain Laurin

Xiao-Guang Chen

Barry Roy Ellard

Alan Gray

Clark Howard Weaver

Kun Liu

Pierre Marchand

Mario Roux

Kevin Paul Hicklin

Jeffrey David Hankin

Christopher W Jowett

Martin Fortier

Greg Lea

Mohammad Shakiba

The present disclosure concerns composite material having improved strength at elevated temperatures. The composite material comprises a matrix of an aluminum alloy (comprising, in weight percent, Si 0.05-0.30, Fe 0.04-0.6, Mn 0.80-1.50, Mg 0.80-1.50 and the balance being aluminum and unavoidable impurities) as well as particles of a filler material dispersed within the matrix. The matrix can optionally comprise Cu and/or Mo. In some embodiments, the composite material comprises, as a filler material, BC as well as an additive selected from the group consisting of Ti, Cr, V, Nb, Zr, Sr, Sc and any combination thereof. The present disclosure also provides processes for making such composite materials.

Composite material having improved mechanical properties at elevated temperatures

An aluminum alloy for making an extruded and brazed aluminum product, the aluminum alloy comprising, in weight percent, 0.10-0.20 Zn to improve corrosion resistance, 0.9-1.2 Mn, 0.03-0.10 Mg, the sum of Mg and Mn being at least 0.99 to maintain or improve strength, 0.15 to 0.30 Fe to control grain size, up to 0.15 Si, up to 0.03 Cu, up to 0.04 Ti, the balance being aluminum and unavoidable impurities. The alloy may be in the form of extrusion ingots or extruded and brazed aluminum products. A process for making an extruded and brazed aluminum product from the alloy involves homogenizing, extruding, optionally working, and brazing the alloy to form the product.

Corrosion resistant alloy for extruded and brazed products

An aluminum alloy composition includes, in weight percent: less than or equal to 0.70 iron; less than or equal to 0.30 silicon; and less than or equal to 0.30 copper, with the balance being aluminum and other elements, with the other elements being present at up to 0.05 weight percent each and up to 0.15 weight percent total. The alloy is homogenized at a temperature of 520&#xb0; C. to 570&#xb0; C. for 2-10 hours. The volume phase fraction of a-AlFeSi phase present in the homogenized aluminum alloy product may be at least 10%.

Aluminum alloy composition and method

An aluminum alloy includes, in weight percent, 0.50-1.30% Si, 0.2-0.60% Fe, 0.15% max Cu, 0.5-0.90% Mn, 0.6-1.0% Mg, and 0.20% max Cr, the balance being aluminum and unavoidable impurities. The alloy may include excess Mg over the amount that can be occupied by Mg&#x2014;Si precipitates. The alloy may be utilized as a matrix material for a composite that includes a filler material dispersed in the matrix material. One such composite may include boron carbide as a filler material, and the resultant composite may be used for neutron shielding applications.

Aluminum alloy composition with improved elevated temperature mechanical properties

An aluminum alloy composition includes, in weight percent:

An aluminum alloy having an excellent combination of strength, extrudability and corrosion resistance may include in weight percent, about 0.01% or less copper; about 0.15% or less iron; about 0.60 to about 0.90% manganese, where manganese and iron are present in the alloy in a Mn:Fe ratio of at least about 6.6; about 0.02% or less nickel; about 0.08 to about 0.30% silicon; about 0.10 to about 0.20% titanium; and about 0.05 to about 0.20% zinc; the balance being aluminum and unavoidable impurities. Extruded articles and other articles may be formed using the alloy. Methods of forming such articles may include homogenizing a billet of the alloy prior to forming the article.

Aluminum alloy having an excellent combination of strength, extrudability and corrosion resistance

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.

Aluminum alloy for extrusion and drawing processes

An aluminium extrusion having a minimum section thickness and made from an aluminium alloy includes, in weight percent, between approximately 1.0 and 1.7 manganese, and between approximately 0.5 and 1.1 silicon, less than 0.3 iron with the balance being Al and inevitable impurities each less than 0.05 weight % and totaling less than 0.15 weight %, the extrusion being formed with an extrusion ratio less than 125 to retain a fibrous grain structure in which less than 40% of the minimum section thickness is recrystallized.

High strength aluminium alloy extrusion

A population of extrusion billets has a specification such that every billet is of an alloy of composition (in wt. %): Fe&#x3c;0.35; Si 0.20-0.6; Mn&#x3c;0.10; Mg 0.25-0.9; Cu&#x3c;0.015; Ti&#x3c;0.10; Cr&#x3c;0.10; Zn&#x3c;0.03; balance Al of commercial purity. After ageing to T5 or T6 temper, extruded sections can be etched and anodised to give extruded matt anodised sections having improved properties.

Aluminum alloy and extrusion

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&#xb0; C.

Al&#x2014;Mn based aluminum alloy composition combined with a homogenization treatment

The present invention provides extruded tubes for heat exchangers having improved corrosion resistance when used alone and when part of a brazed heat exchanger assembly with compatible finstock. The tubes are formed from a first aluminum alloy containing 0.4 to 1.1% by weight manganese, up to 0.01% by weight copper, up to 0.05% by weight zinc, up to 0.2% by weight iron, up to 0.2% by weight silicon, up to 0.01% by weight nickel, up to 0.05% by weight titanium and the balance aluminum and incidental impurities. The fins are formed from a second aluminum alloy containing 0.9 to 1.5% by weight manganese or an alloy of the AA3003 type, this second aluminum alloy further containing at least 0.5% by weight zinc.

Aluminum alloy tube and fin assembly for heat exchangers having improved corrosion resistance after brazing

When using AA3000 series and AA1000 series aluminum alloys to produce extruded products for heat exchanger applications, by controlling the level of copper and nickel in the alloy to very low levels it is possible to produce excellent corrosion resistance both before and after a brazing cycle. To achieve these results, the copper content should be no more than 0.006% by weight and the nickel no more than 0.005% by weight. A typical alloy of the invention contains about 0.001-0.5% by weight manganese, 0.001-0.7% by weight iron, 0.001-0.02% by weight titanium, 0.001-0.3% by weight silicon, less than 0.006% by weight copper, less than 0.005% by weight nickel and 0.001-0.02% by weight zinc, with the balance consisting of aluminum and incidental impurities. No zinc addition to the alloy is required either by zinc spraying or by alloy addition.

Aluminum alloys having high corrosion resistance after brazing

A novel extrudable aluminum based alloy is described consisting essentially of 0.60-0.84% magnesium, 0.45-0.58% silicon, 0.15-0.40% copper, 0.04-0.35% chromium, or 0.20-0.80% manganese, less than 0.25% iron, where Si>&equals;(Mg/1.73&plus;(Mn&plus;Cr&plus;Fe)/3&minus;0.04), and the balance essentially aluminum. In the alloy of the present invention, the magnesium content has been reduced to the minimum possible for mechanical properties. In this way, the magnesium silicide content of the alloy has been reduced, providing a very beneficial effect on extrudability.

Extrudable aluminum alloys

An alloy of composition in wt. % (see table (I)) and incidental impurities up to 0.05 each 0.15 total, balance A1. The alloy can be extruded at high speed to provide extruded sections which meet T5 or T6 strength requirements.

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Kingston, Canada

Nicholas Charles Parson