Grain refiners are specialized additives used in aluminum alloy casting to control grain structure and enhance mechanical properties.
Grain refiners are critical metallurgical components added to molten aluminum alloys during the casting process to promote heterogeneous nucleation, resulting in a fine, equiaxed grain structure. This refinement significantly improves the alloy's mechanical properties, including tensile strength, ductility, fatigue resistance, and surface finish, while reducing hot tearing and porosity defects in the final billet.
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Grain refiners are added to control the solidification microstructure by promoting fine, equiaxed grains, which enhances mechanical properties like strength and ductility, reduces casting defects, and improves machinability.
Unlike modifiers that change phase morphology or degassers that remove impurities, grain refiners specifically target grain structure formation during solidification through nucleation sites, making them essential for microstructure control.
The most common are Al-Ti-B master alloys (containing TiB2 particles) and Al-Ti-C master alloys. Al-Ti-B is widely used for most aluminum alloys, while Al-Ti-C is preferred for alloys sensitive to boron contamination.
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