Master Alloys

Aluminium’s mechanical and physical properties are enhanced with the use of alloying elements. These alloying elements are commonly referred to as hardeners.

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Aluminium’s mechanical and physical properties are enhanced with the use of alloying elements. These alloying elements are commonly referred to as hardeners.

Aluminium-based master alloys which contain the hardener elements in high concentrations, provide a convenient and economical way to add them to aluminum to achieve desired properties.

These master alloys readily go into solution at lower liquid aluminium temperatures, thus minimizing dross formation and solubility of hydrogen. Lower furnace temperatures also mean reduced energy consumption and longer furnace life.

Product Types

Zirconium is added to certain aluminium-magnesium-zinc alloys such as 7050 which reduces stress corrosion susceptibility. Zirconium additions in the range 0.1 to 0.3% are used to form a fine precipitate of intermetallic particles that inhibit recovery and recrystallization.

An increasing number of alloys, particularly in the aluminium-zinc-magnesium family, use zirconium additions to increase the recrystallization temperature and to control the grain structure in wrought products. Zirconium additions leave this family of alloys less quench sensitive than similar chromium additions. Higher levels of zirconium are employed in some superplastic alloys to retain the required fine substructure during elevated-temperature forming. Zirconium additions have been used to reduce the as-cast grain size, but its effect is less than that of titanium.

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Aluminium vanadium is used in the manufacture of various alloys. Vanadium enhances strength, raises the recrystallization temperature and reduces the thermal expansion co-efficient.

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The electrical and thermal conductivity of aluminum can be improved by the addition of trace amounts of boron to eliminate the undesirable effects of chromium, titanium, vanadium, and zirconium. aluminum boron master alloys provide a convenient mechanism for making the desired boron addition. Boron has also been acknowledged as an effective grain refiner for silicon aluminum alloys.

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AMG Aluminum has recently developed a proprietary method to manufacture conventional ingot metallurgy based aluminium scandium master alloys. These alloys are designed to support the development of new and emerging aerospace and high performance aluminum alloys containing the element scandium. Currently an Al-2% Sc product is available in standard waffle ingot form but the manufacturing process is sufficiently adaptable to meet the specific product requirements of the advanced aluminium alloy design community.

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Modification of the silicon-aluminium phase from coarse platelets to a fine fibrous structure in hypoeutectic aluminium silicon alloy castings results in improved soundness and mechanical properties, particularly ductility. The use of strontium to “modify” the structure of hypoeutectic aluminium silicon casting alloys is an effective and widely accepted practice.

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Calcium aluminium alloys available in; 6% calcium in a waffle ingot or rod/bar; and 10% calcium in a waffle ingot, slab ingot or super slab ingot.

Copper aluminium alloys available in; 20% copper in a slab ingot; and 33% copper in a waffle ingot or slab ingot; 50% copper in a slab ingot; and 54% copper in a broken ingot.

Iron aluminium alloys available in; 20% iron in a waffle ingot; and 25% iron in a waffle ingot.

Magnesium aluminium alloys available in; 50% magnesium in a broken slab; and 68% magnesium in buttons, a waffle ingot or a slab / super slab.

Manganese aluminium alloys available in 25% manganese in a slab ingot or waffle ingot.

Nickel aluminium alloys available in 20% nickel in a waffle ingot.

Silicon aluminium alloys available in; 25% silicon in a waffle ingot; and 36% silicon in a waffle ingot or slab ingot; and 50% silicon in a waffle ingot.

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