Swiss Aluminium Ltd.

Kb Alloys

William C Setzer

David K Young

Philip R Sperry

Michael J Pryor

Joseph Winter

Richard J Malliris

Francis P Koch

Lloyd E Damon

Douglas L Graham

Frank P Koch

Robert A Rapp

Noel Jarrett

Gary W Boone

Julius C Fister

Harvey P Cheskis

Damian V Gullotti

Ronald G Hardy

Richard D Lanam

Matthew M Guzowski

E Dennis Bishop

Bryan T Dunville

Leon Cox

This invention relates to master alloy hardeners for use in preparing aluminum base alloys. The respective concentrations of the alloying elements in the master alloy hardener are a multiple equal to or greater than 2 of the concentrations of such elements in the base alloy, and the ratios of the alloying elements in the master alloy hardener to each other are the same as the ratios of the alloying elements in the base alloy. After the aluminum base alloy and the concentration of each alloying element therein are identified, a desired multiple of such concentrations is determined. An aluminum master alloy is prepared that contains the alloying elements at concentrations equivalent to such multiple of the corresponding concentrations of the elements in the base alloy. The master alloy hardeners are added to commercially pure aluminum to provide the desired base alloy.

Master alloy hardeners

A process for hardening aluminum comprises the steps of adding a magnesium hardener to molten aluminum wherein the hardener has a magnesium content in the range of 64-72 wt % based on the weight of the hardener, with a remaining portion of the hardener comprising aluminum. The process may further include the steps of preheating the hardener prior to adding the hardener to the aluminum for decreasing a temperature differential between the hardener and the aluminum so as to stabilize the hardener and prevent shattering thereof.

Process for hardening aluminum using a magnesium alloy

A process for producing a magnesium alloy aluminum hardener comprises the steps of providing magnesium alloy scrap, wherein the scrap comprises aluminum present in a range of 1-10 wt. % based on the weight of the scrap and at least one of zinc present in a range of 0.1-3 wt. % based on the weight of the scrap and manganese present in a range of 0.1-3 wt. % based on the weight of the scrap, wherein a remaining portion of the scrap comprises magnesium; providing molten aluminum; and adding the scrap to the molten aluminum until the hardener is produced having a magnesium content in a range of 64-72 wt. % based on the weight of the hardener, with a remaining portion of the hardener comprising aluminum and at least one of zinc and manganese.

Magnesium alloy as an aluminum hardener

Aluminum base alloy consisting essentially of from 0.1 to 3.0% boron, from 1 to 10% titanium and the balance essentially aluminum wherein the aluminum matrix contains TiB.sub.2 particles dispersed throughout said matrix having an average particle size of less than 1 micron, and wherein the matrix contains clusters of said TiB.sub.2 particles greater than 10 microns in size with an average of less than 4 of said clusters per 2 cm.sup.2. The alloy is prepared by adding a boron containing material selected from the group consisting of borax, boron oxide, boric acid and mixtures thereof, and K.sub.2 TiF.sub.6 to a bath of molten aluminum and stirring the molten mixture.

Aluminum base alloy

Aluminum base alloy and method for preparing same

Method for preparing master alloy hardeners for use in preparing an

Improved aluminum master alloys containing strontium and boron are provided for simultaneously modifying and grain refining Al alloys, and in particular, hypoeutectic Al-Si alloys. The improved master alloy contains, by weight percent, about 0.20-20% Sr, 0.10-10% B, and the balance Al with impurities. The master alloy may also contain about 0.20 to about 20% Si by weight percent. The master alloys have a high degree of ductility for purposes of forming continuously rolled master alloy rod stock.

Aluminum master alloys containing strontium, boron, and silicon for

A composite aluminum base alloy foil is described which is particularly useful as foil material in electrical capacitors. The composite is based on the use of a relatively lower purity, inexpensive core material clad on both sides with a relatively higher purity, more expensive cladding material.

Composite aluminum capacitor foil

A process for making aluminum alloy conductor wire having an electrical conductivity of at least 60.0% IACS which involves processing an alloy containing from 0.04 to 1.0% by weight iron, from 0.02 to 0.2% by weight silicon, from 0.1 to 1.0% by weight copper, from 0.001 to 0.2% by weight boron, balance essentially aluminum and processing said alloy without a final redraw step into wire. The process preferably includes hot working from at least approximately 900.degree. F. without reheating to form the redraw rod. This hot working is performed in order to allow the wire produced from this process to meet the desired properties at the final gages, such properties including high electrical conductivity under rapid annealing conditions.

Process for making aluminum alloy conductor wire

Aluminum alloys exhibiting improved resistance weldability are prepared which comprise 2.0-6.0% magnesium, up to 0.40% iron, up to 0.40% silicon, and from 0.03-0.20% vanadium, balance essentially aluminum. The alloys of the present invention are particularly suited for automotive metal working applications.

Method for preparing aluminum alloys possessing improved resistance

Aluminum alloys exhibiting improved resistance weldability are prepared which comprise 1.9-5.5% copper, up to 1.5% iron, up to 1.2% silicon, up to 1.2% manganese, 0.02-2.0% magnesium, and from 0.03-0.20% vanadium, balance essentially aluminum. The alloys of the present invention are particularly suited for automotive metal working applications.

Aluminum alloys possessing improved resistance weldability

The present invention comprises an improved process for the preparation of aluminum base alloys containing magnesium and silicon in wrought form, and particularly as tread plate which includes the steps of casting, homogenizing, hot rolling within a critical temperature and time range and cooling at a rate greater than a critical rate and before a critical delay time after said hot rolling step. The resulting product can be artificially aged without the need for a separate solution heat treatment and possesses improved tensile properties, surface appearance and corrosion resistance.

Thread plate process

A method of extruding aluminum base alloys having high strength and high electrical conductivity properties which comprises providing an aluminum base alloy containing from 0.04 to 1.0% iron, from 0.02 to 0.2% silicon, from 0.1 to 1.0% copper, from 0.001 to 0.2% boron, balance essentially aluminum; heating the cast alloy ingot or billet to a desired extrusion temperature, extruding the material, cooling the extruded product, drawing down the cooled product, and finally aging the drawn product. The alloy material utilized may be homogenized before being extruded.

Method of extruding aluminum base alloys

A composite aluminum alloy brazing sheet and methods of producing the brazing sheet are disclosed. The brazing sheet includes a non-heat treatable aluminum base alloy core containing zirconium, chromium and manganese as the alloying ingredients. Bonded to at least one of the major face surfaces of the core is an aluminum base alloy sheet containing silicon plus optional additions of copper, zinc and magnesium. The core alloy resists softening and sagging at brazing temperatures while retaining good mechanical properties after the brazing operation is completed.

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Creve Coeur, MO, United States of America

William C Setzer