Grain refiner for aluminum alloys improves microstructure and mechanical properties during solidification.
A grain refiner is a specialized additive used in aluminum alloy production, particularly for high-strength extrusion billets, to promote heterogeneous nucleation during solidification. It introduces fine, uniformly distributed nucleation sites that refine the grain structure, reducing grain size from millimeters to micrometers. This refinement enhances mechanical properties including tensile strength, ductility, fatigue resistance, and reduces hot tearing susceptibility. The component is typically added to molten aluminum before casting to control solidification kinetics and optimize the microstructure for subsequent extrusion processes.
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The optimal addition rate typically ranges from 0.5 to 2.0 kg per ton of aluminum, depending on alloy composition, casting conditions, and desired grain size. Higher addition rates may be needed for alloys with higher solute content or faster solidification rates.
Al-Ti-B refiners (containing TiB2 particles) are more common and effective for most aluminum alloys, while Al-Ti-C refiners (containing TiC particles) are preferred for alloys containing zirconium or chromium, as they avoid poisoning effects. Al-Ti-C also provides better fading resistance in some applications.
Key parameters include chemical composition (Ti, B, C content), particle size distribution, nucleant particle density, impurity levels (especially Fe, Si), and dissolution characteristics. Regular testing ensures consistent grain refinement performance.
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