Aluminium/Aluminum Silicon Strontium (AlSr) Master Alloy

Topics Covered

Chemical Composition
Physical Properties


Master alloys are base metals which can be mixed with elements of higher percentage, and are added to a melt to achieve the desired result. They are formed in many shapes, and are also known as modifiers, hardeners, or grain refiners based on their applications. They are used instead of a pure metal because they are very economical and save energy and production time. They are suitable for structure control and composition adjustment.

Chemical Composition

The chemical composition of aluminium/aluminum silicon strontium master alloy is given in the following table.

Element Content (%)
Aluminium, Al 95.5-97.5
Strontium, Sr 2.5-4.5
Silicon, Si 0.3
Iron, Fe 0.3
Copper, Cu 0.1
Others 0.1

Physical Properties

The following table outlines the physical properties of aluminium/aluminum silicon strontium master alloy.

Properties Metric Imperial
Density 2.64-2.70 g/cm³ 0.095-0.097 lb/in³
Melting point 700-710°C 372-377°F


Aluminium/aluminum silicon strontium master alloy is an aluminium silicon-strontium alloy utilized as a modifier of hypo-eutectic and AlSi eutectic casting alloy.

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