AlTi10 (EN 575)
Aluminum-titanium 10% master alloy for grain refinement. Produces fine, uniform equiaxed grain structure.
AlTi10% master alloy contains 10% titanium in an aluminum matrix and is the classic grain refiner for aluminum casting. Titanium acts as a heterogeneous nucleant during solidification, promoting the formation of fine equiaxed grains instead of coarse columnar structures. Finer grain translates to better mechanical properties, reduced shrinkage porosity, and improved feeding capacity. Typically added as waffles, bars, or shot.
Chemical Composition
| Element | Symbol | Percentage |
|---|---|---|
| Aluminum | Al | Balance (~90 %) |
| Titanium | Ti | 9.5–10.5 % |
| Iron | Fe | ≤ 0.30 % |
| Silicon | Si | ≤ 0.30 % |
| Vanadium | V | ≤ 0.15 % |
Physical Properties
| Property | Value |
|---|---|
| Melting point | 660–750 °C |
| Density | ~2.80 g/cm³ |
| Form | Waffle, barra o granalla |
Metallurgical Function
Grain refinement. TiAl₃ particles act as nucleation sites during solidification, producing a fine, equiaxed grain structure that improves feeding, reduces porosity, and enhances mechanical properties.
Dosage & Usage
Typical addition: 0.5–2.0 kg per ton of molten aluminum, depending on desired grain size. Added to the molten bath at 720–750 °C, 15–30 minutes before pouring. The effect fades over time, so pouring within 30 minutes of addition is recommended.
Applications
- Grain refinement in all aluminum casting alloys
- Mechanical property improvement in T6 parts
- Shrinkage porosity reduction
Industries
Aluminum Casting
Standard grain refinement for all alloys
Automotive
Structural integrity improvement in engine and transmission parts
Special Notes
For maximum refinement effect, consider AlTi5B1 (AlTiBoron) which combines titanium with boron for a more potent and lasting synergistic effect. AlTi10% is preferred when boron is not desired in the alloy.
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