Strontium Aluminum Alloy, Sr-Al Alloy, 7440-24-6

ALUMINUM STRONTIUM ALLOY (Al-Sr ALLOY)

PRODUCT IDENTIFICATION INFORMATION

CHEMICAL STRUCTURE

    Aluminum Strontium Alloy (Al-Sr)
    
    Microstructure
    
    Aluminum Matrix (α-Al) with
    Strontium-rich Intermetallic Phases
    
          Al           Al
            \         /
             Sr --- Sr
            /         \
          Al           Al
    
    Al-Sr Intermetallic Compounds
    (Al₄Sr, Al₂Sr, AlSr)

Key Components:

• Aluminum (Al): Matrix metal (lightweight, corrosion-resistant)

• Strontium (Sr): Modifier / grain refiner (improves morphology of silicon)

• Intermetallic Compounds: Al₄Sr, Al₂Sr, AlSr

SECTION 1: CHEMICAL IDENTITY AND DEFINITION

SECTION 2: PHYSICAL AND CHEMICAL PROPERTIES

SECTION 3: COMMON AL-Sr ALLOY GRADES

SECTION 4: CHEMICAL COMPOSITION (TYPICAL VALUES)

AlSr5 (5% Strontium) - Master Alloy

AlSr10 (10% Strontium) - Master Alloy

SECTION 5: PRODUCTION METHODS

Method 1: Melt Alloying (Most Common Method)

• Process: Pure aluminum + Strontium → Melting → Alloying → Casting → Ingot

• Description: Pure aluminum and strontium (or strontium-containing master alloys) are melted under protective atmosphere; Homogeneous mixing is achieved; Cast into molds to obtain ingots; Most common industrial production method

Method 2: Master Alloy Route

• Process: Pre-made Al-Sr master alloy → Dilution with pure aluminum → Desired Sr content → Casting

• Description: High-strontium master alloy is diluted with pure aluminum; Desired strontium content is achieved; Provides more homogeneous distribution

Method 3: Vacuum Melting

• Process: Aluminum + Strontium → Vacuum melting → Alloying → Casting

• Description: Alloying is performed under vacuum to prevent oxidation; Produces high-purity alloys; Used for specialized applications

SECTION 6: FUNCTIONAL PROPERTIES AND MECHANISM OF ACTION

SECTION 7: MAIN APPLICATION AREAS

SECTION 8: QUALITY SPECIFICATIONS (AlSr5 MASTER ALLOY)

SECTION 9: TOXICOLOGICAL PROFILE

SECTION 10: GHS CLASSIFICATION AND LABELING

GHS Classification (Compliant with CLP and UN GHS):

Note: Al-Sr alloy is generally considered non-hazardous. However, processing dust may cause mechanical irritation.

Signal Word: No signal word required (non-hazardous) or WARNING (optional)

Hazard Pictograms: GHS07 (optional)

Hazard Statements (H-Codes) - if classified:

NFPA 704 Hazard Classification:

SECTION 11: PRECAUTIONARY STATEMENTS (P-CODES)

SECTION 12: FIRST AID MEASURES

SECTION 13: FIREFIGHTING MEASURES

SECTION 14: STORAGE AND SHELF LIFE

SECTION 15: PACKAGING OPTIONS

SECTION 16: TRANSPORT INFORMATION

SECTION 17: REGULATORY STATUS

SECTION 18: OTHER NAMES AND SYNONYMS

SECTION 19: SUMMARY TABLE

SECTION 20: CRITICAL WARNINGS AND BEST PRACTICES

CRITICAL WARNINGS:

• Non-hazardous material but processing dust may cause respiratory irritation.

• Non-combustible. Does not burn. Stable at high temperatures.

• Strontium reacts with water. Protect from moisture.

• Molten metal contact with water may cause violent reaction (hydrogen gas generation).

• Alloy selection is critical for application success.

• Incompatibilities: Keep away from strong acids, strong bases, and oxidizing agents.

• Hygiene Requirement: Wash hands thoroughly after handling.

BEST PRACTICE RECOMMENDATIONS:

• Al-Si Alloy Modification: Use AlSr5 or AlSr10 master alloy for modifying eutectic silicon; Typical addition 0.01-0.03% Sr by weight; Changes silicon morphology from acicular to fibrous; Improves ductility and tensile strength.

• Grain Refinement: Use for grain refining of aluminum alloys; Reduces grain size; Improves mechanical properties.

• Casting Applications: Add to melt during casting operations; Effective in pressure die casting, permanent mold casting; Improves fluidity and castability.

• Handling: Use in well-ventilated areas; Avoid dust generation; Wear protective gloves and safety goggles.

• Personal Protective Equipment: Safety goggles, protective clothing, protective gloves (nitrile, neoprene), NIOSH-approved dust mask.

• Hygiene: Wash hands thoroughly after handling; Do not eat, drink, or smoke when using.

• Storage: Store in cool, dry, well-ventilated area; Protect from moisture; Keep away from acids and bases.

• Spill Response: Avoid dust generation; Vacuum or sweep; Place in closed containers; Do not allow to enter drains or waterways.

• Disposal: Dispose of in accordance with local, regional, and national regulations; Al-Sr is recyclable; Recycle where possible.

SPECIAL NOTE ON SILICON MODIFICATION:

Strontium modifies the eutectic silicon in Al-Si alloys:

• Effect: Changes silicon from acicular (needle-like) to fibrous/globular

• Mechanism: Prevents preferential growth of silicon; Affects nucleation and growth

• Benefits: Increased ductility; Improved tensile strength; Better machinability; Reduced porosity

• Typical Addition: 0.01-0.03% Sr by weight

• Fading: Sr modification can fade over time; Re-addition may be required

SPECIAL NOTE ON MELT SAFETY:

Important considerations for Al-Sr alloy melting operations:

• Strontium Reactivity: Strontium reacts with water and moisture; Produces hydrogen gas (flammable)

• Precaution: All equipment and molds must be dry; Use protective atmosphere

• Fire Extinguishing: DO NOT USE WATER on molten alloy; Use dry chemical powder or sand

• Ventilation: Adequate ventilation required (hydrogen gas generation)

LEGAL DISCLAIMER:

The information provided in this document is based on our current knowledge and experience and is presented in good faith. However, as all conditions of use are beyond our control, this document does not constitute a binding specification or warranty. This Technical Data Sheet is for informational purposes only. Users are responsible for testing suitability for their own applications. For complete safety, storage, handling, transportation, waste, and regulatory compliance information, please refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier.