Aluminium-magnesium-silicon Master Alloy，Aluminium-magnesium-silicon Alloy，AlMgSi Alloy，E FORU

**Product Datasheet: Aluminium-Magnesium-Silicon Master Alloy (Al-Mg-Si Alloy)** **Version:** 1.0 | **Date:** 2025-04-02 --- ### **1. General Overview** Aluminium-Magnesium-Silicon Master Alloy (Al-Mg-Si Alloy) is a fundamental and versatile master alloy system that forms the basis for the widely used 6xxx series aluminium alloys. This ternary system enables precise control of magnesium and silicon ratios to form Mg₂Si precipitates during heat treatment, providing excellent age-hardening response. The Al-Mg-Si master alloy is essential for producing alloys with optimal strength, corrosion resistance, and extrudability for architectural, automotive, and structural applications. --- ### **2. International Standards** Al-Mg-Si master alloys are covered by numerous international standards: - **ASTM:** ASTM B179 (Standard Specification for Aluminum Alloys in Ingot and Molten Forms) - **ISO:** ISO 209-1 (Wrought aluminium and aluminium alloys) - **EN:** EN 1676 (Aluminium and aluminium alloys - Master alloys) - **AA:** Aluminum Association designations for 6xxx series alloys - **JIS:** JIS H 4000 (Aluminium and aluminium alloy sheets and plates) - **GB/T:** GB/T 3190 (Wrought aluminium and aluminium alloy chemical composition) - **Typical Master Alloy Grades:** Al-5Mg-3Si, Al-10Mg-6Si, Al-15Mg-9Si --- ### **3. Chemical Composition (Weight %)** Typical composition ranges for Al-Mg-Si master alloy: | Element | Content (%) | Role & Remarks | |---------------------|-------------------|------------------------------------------| | Magnesium (Mg) | 3.0 – 20.0 | Primary alloying element | | Silicon (Si) | 2.0 – 12.0 | Primary alloying element | | Iron (Fe) | ≤ 0.20 | Impurity control | | Copper (Cu) | 0 – 0.10 | Controlled addition for specific grades | | Manganese (Mn) | 0 – 0.10 | Grain refinement | | Chromium (Cr) | 0 – 0.10 | Recrystallization control | | Other Impurities | ≤ 0.15 total | — | | Aluminium (Al) | Balance | Base metal | *Note: The Mg:Si ratio is typically controlled at approximately 1.73:1 to form stoichiometric Mg₂Si* --- ### **4. Physical Properties** | Property | Value / Range | |---------------------------|-----------------------------------| | Density | 2.6 – 2.8 g/cm³ | | Melting Range | 580 – 650°C | | Intermetallic Phases | Mg₂Si, Al₈Fe₂Si, Al₅FeSi | | Thermal Conductivity | 120 – 180 W/m·K | | Electrical Conductivity | 40 – 55 % IACS | | Vickers Hardness | 50 – 110 HV | | Coefficient of Thermal Expansion | 23–25 × 10⁻⁶/K | --- ### **5. Key Characteristics & Advantages** - **Excellent Age Hardening:** Strong precipitation hardening response through Mg₂Si formation - **Good Corrosion Resistance:** Superior to 2xxx and 7xxx series alloys - **High Extrudability:** Excellent hot workability for complex profiles - **Good Weldability:** Can be welded using all conventional methods - **Anodizing Response:** Produces high-quality, durable anodized finishes - **Machinability:** Good machining characteristics in T6 temper --- ### **6. Product Applications** - **Architectural Extrusions:** Window frames, door frames, curtain walls - **Automotive Components:** Bumpers, body panels, structural members - **Marine Applications:** Boat hulls, superstructures, marine hardware - **Bridge Railings:** Structural components with good corrosion resistance - **Electrical Conductors:** Bus bars, electrical enclosures - **Consumer Goods:** Ladders, furniture, sporting equipment - **Heat Exchangers:** Automotive radiators, air conditioning components --- ### **7. Available Forms** - **Master Alloy:** Ingots, notch bars, waffle plates - **Wrought Products:** Extruded profiles, sheet, plate, rod - **Special Forms:** Custom compositions for specific applications - **Standard Sizes:** 5–20 kg ingots --- ### **8. Technical Guidelines for Use** - **Addition Rate:** 0.8–1.5% master alloy to achieve target Mg₂Si content - **Melt Temperature:** 710–760°C - **Holding Time:** 30–60 minutes for homogenization - **Stirring:** Moderate mechanical stirring recommended - **Casting Temperature:** 690–730°C - **Heat Treatment:** Solution treatment 520–580°C, aging 150–180°C --- ### **9. Heat Treatment Response** | Temper Designation | Solution Treatment | Aging Treatment | Typical Yield Strength (MPa) | |--------------------|-------------------|-----------------|------------------------------| | **T4** | 530°C/1h | Natural aging | 120–180 | | **T5** | None | 180°C/8h | 180–240 | | **T6** | 530°C/1h | 175°C/8h | 240–310 | | **T651** | 530°C/1h | 175°C/8h + stress relief | 250–320 | --- ### **10. Common Commercial Alloys** | Alloy | Mg Content (%) | Si Content (%) | Key Features | Typical Applications | |-------|----------------|----------------|--------------|---------------------| | **6060** | 0.35–0.6 | 0.3–0.6 | Good formability | Architectural extrusions | | **6061** | 0.8–1.2 | 0.4–0.8 | Medium strength | Marine, automotive | | **6063** | 0.45–0.9 | 0.2–0.6 | Excellent extrudability | Window frames | | **6082** | 0.6–1.2 | 0.7–1.3 | High strength | Structural applications | --- ### **11. Quality Control Parameters** - Precise Mg:Si ratio control (±0.05%) - Homogeneous microstructure - Low hydrogen content (< 0.12 ml/100g) - Controlled iron content for phase modification - Mechanical properties certification --- ### **12. Health, Safety & Handling** - **Standard Handling:** Generally safe with standard precautions - **Dust Control:** Avoid inhalation of fine particles during processing - **Personal Protection:** Standard foundry PPE required - **Ventilation:** Adequate fume extraction recommended - **Storage:** Dry conditions to prevent oxidation - **Disposal:** Follow standard metal disposal protocols --- ### **13. Extrusion Characteristics** | Parameter | Performance Rating | Characteristics | |-----------|-------------------|-----------------| | **Extrusion Speed** | Excellent | High speeds achievable | | **Surface Quality** | Excellent | Smooth, bright surfaces | | **Die Life** | Good | Moderate die wear | | **Tolerance Control** | Excellent | Consistent dimensional control | --- ### **14. Corrosion Performance** - **Atmospheric Corrosion:** Excellent resistance to industrial and marine atmospheres - **Stress Corrosion Cracking:** Generally immune in T6 temper - **Galvanic Corrosion:** Can occur when coupled with more noble metals - **Intergranular Corrosion:** Susceptible in improperly heat-treated conditions --- ### **15. Research & Development Trends** - **High-Strength Variants:** Development of alloys with yield strength >400 MPa - **Enhanced Formability:** Improved bendability and stretch formability - **Recycling Optimization:** Better control of impurity elements in recycled alloys - **Additive Manufacturing:** Development of Al-Mg-Si powders for 3D printing - **Nanostructured Alloys:** Control of precipitate distribution at nanoscale --- ### **Disclaimer** This information is provided for technical reference only. Properties and performance may vary based on specific application conditions, processing parameters, and heat treatment practices. The optimal Mg:Si ratio and heat treatment parameters should be determined for each specific application. Users are advised to conduct thorough testing to verify suitability for their intended use. Always follow good manufacturing practices and safety guidelines.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2302 gallon liquid totes Special package is available on request.