INDUSTRY COMPONENT

Grain Refiner

Grain refiner for aluminum alloys improves microstructure and mechanical properties during solidification.

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Component Specifications

Definition
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.
Working Principle
Grain refiners work through heterogeneous nucleation principles. They contain master alloys with nucleating particles (typically Al-Ti-B or Al-Ti-C systems) that have lattice parameters closely matching aluminum. When added to molten aluminum, these particles remain solid and act as substrates for aluminum crystal formation during solidification. The nucleating particles lower the energy barrier for solidification initiation, promoting the formation of numerous small grains rather than few large ones. This creates a fine, equiaxed grain structure throughout the billet, which improves mechanical properties and processability.
Materials
Master alloys containing titanium (Ti) and boron (B) or carbon (C) in aluminum matrix. Common compositions: Al-5Ti-1B, Al-3Ti-1B, Al-3Ti-0.15C. Titanium content: 3-10%, Boron content: 0.5-1.5%, Carbon content: 0.1-0.3%. Purity: >99.7% aluminum base. Particle size distribution: 10-100 μm for uniform dispersion.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Density2.7-3.0 g/cm³
Shelf Life12 months in sealed packaging
Addition Rate0.5-2.0 kg per ton of aluminum
Melting Point660°C (aluminum matrix)
Storage TemperatureRoom temperature, dry conditions
Grain Size ReductionFrom 1000-5000 μm to 100-300 μm
Nucleant Particle Density10^4-10^6 particles per cm³

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 209-1, ISO 209-2, DIN EN 573-1, DIN EN 573-3, ASTM B275

Parent Products

This component is used in the following industrial products

High-Strength Aluminum Alloy Extrusion Billet

A high-strength aluminum alloy extrusion billet is a semi-finished industrial material supplied as cylindrical or rectangular logs.

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High-Purity Aluminum Alloy Ingot

High-purity aluminum alloy ingots are standardized, semi-finished metal products produced through direct chill casting or continuous casting processes.

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High-Purity Copper Alloy Master Alloy

Pre-alloyed copper-based material for precise composition control in non-ferrous metal production

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Engineering Analysis

Risks & Mitigation
  • Fading effect over time in molten aluminum
  • Poisoning by certain alloying elements (Zr, Cr)
  • Inconsistent dispersion leading to uneven grain structure
  • Over-addition causing excessive TiAl3 formation
  • Moisture absorption during storage affecting performance
FMEA Triads
Trigger: Insufficient mixing or improper addition technique
Failure: Uneven grain refinement, coarse grain zones in billet
Mitigation: Implement standardized addition procedures, use automated feeding systems, ensure adequate stirring time (5-10 minutes)
Trigger: Exposure to moisture during storage or handling
Failure: Hydrogen pickup in molten aluminum, porosity in final product
Mitigation: Store in sealed, moisture-proof containers, use desiccants, pre-dry if necessary before addition
Trigger: Incorrect addition rate calculation
Failure: Over-refinement or under-refinement, wasted material or poor properties
Mitigation: Implement precise weighing systems, calculate based on actual aluminum weight, verify with grain size testing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Chemical composition: Ti ±0.2%, B ±0.05%, C ±0.01%; Particle size: 90% within specified range; Moisture content: <0.1%
Test Method
Chemical analysis by ICP-OES, particle size analysis by laser diffraction, microstructure evaluation by optical microscopy, grain size measurement per ASTM E112

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Grain Refiner

Manufacturer profiles associated with Grain Refiner.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the optimal addition rate for grain refiners in aluminum extrusion billets?

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.

How do Al-Ti-B and Al-Ti-C grain refiners differ?

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.

What are the main quality control parameters for grain refiners?

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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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