Aluminium-magnesium-boron Master Alloy，Aluminium-magnesium-boron Master Alloy，AlMgB Alloy，E FORU

**Product Datasheet: Aluminium-Magnesium-Boron Master Alloy (Al-Mg-B Alloy)** **Version:** 1.0 | **Date:** 2025-04-02 --- ### **1. General Overview** Aluminium-Magnesium-Boron Master Alloy (Al-Mg-B Alloy) is a specialized ternary master alloy designed for advanced grain refinement and property enhancement in aluminium alloys. This unique combination leverages magnesium's solid solution strengthening and boron's exceptional grain refining capabilities, particularly effective for aluminium alloys containing transition metals. The synergistic effect of magnesium and boron provides superior microstructure control and enhanced mechanical properties. --- ### **2. International Standards** Al-Mg-B master alloys are referenced in several international specifications: - **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) - **GB/T:** GB/T 8734 (Aluminium alloy master alloys) - **Typical Master Alloy Grades:** Al-5Mg-1B, Al-10Mg-2B, Al-15Mg-3B, Al-20Mg-4B --- ### **3. Chemical Composition (Weight %)** Typical composition ranges for Al-Mg-B master alloy: | Element | Content (%) | Role & Remarks | |---------------------|-------------------|------------------------------------------| | Magnesium (Mg) | 3.0 – 25.0 | Solid solution strengthening | | Boron (B) | 0.5 – 5.0 | Grain refinement, transition metal removal | | Titanium (Ti) | 0 – 2.0 | Optional addition for enhanced refinement | | Iron (Fe) | ≤ 0.20 | Impurity control | | Silicon (Si) | ≤ 0.15 | Impurity control | | Copper (Cu) | ≤ 0.05 | Impurity control | | Other Impurities | ≤ 0.10 total | — | | Aluminium (Al) | Balance | Base metal | --- ### **4. Physical Properties** | Property | Value / Range | |---------------------------|-----------------------------------| | Density | 2.6 – 2.9 g/cm³ | | Melting Range | 550 – 800°C | | Intermetallic Phases | MgB₂, AlB₂, AlB₁₂, Al₃Mg₂ | | Thermal Conductivity | 90 – 140 W/m·K | | Electrical Conductivity | 35 – 50 % IACS | | Vickers Hardness | 45 – 100 HV | | Coefficient of Thermal Expansion | 22–25 × 10⁻⁶/K | --- ### **5. Key Characteristics & Advantages** - **Superior Grain Refinement:** Combined effect of boron and magnesium for fine, uniform microstructure - **Transition Metal Removal:** Boron effectively removes titanium, vanadium, chromium - **Enhanced Conductivity:** Improves electrical conductivity by removing solid solution elements - **Improved Strength:** Magnesium provides solid solution strengthening - **Better Castability:** Refined grain structure improves feeding and reduces hot tearing - **Synergistic Effect:** Magnesium enhances boron's grain refining efficiency --- ### **6. Product Applications** - **Electrical Conductors:** High-conductivity aluminium alloys for power transmission - **Automotive Castings:** Engine blocks, cylinder heads, structural components - **Aerospace Alloys:** High-strength, lightweight structural components - **Marine Applications:** Corrosion-resistant structural components - **Extrusion Alloys:** Improved surface finish and extrusion speed - **Foundry Alloys:** Enhanced casting characteristics and mechanical properties - **Wire and Cable:** Electrical conductor alloys with optimized properties --- ### **7. Available Forms** - **Master Alloy:** Ingots, notch bars, waffle plates - **Special Forms:** Powder, granules for specific applications - **Standard Sizes:** 5–15 kg ingots - **Custom Compositions:** Tailored Mg:B ratios for specific applications --- ### **8. Technical Guidelines for Use** - **Addition Rate:** 0.5–3.0% master alloy to the melt - **Melt Temperature:** 720–780°C - **Holding Time:** 25–50 minutes for complete reaction - **Stirring:** Moderate mechanical stirring recommended - **Treatment Window:** Optimal effectiveness within 30–90 minutes after addition - **Cooling Rate:** Controlled solidification for optimal structure --- ### **9. Grain Refinement Performance** | Base Alloy | Grain Size Reduction | Yield Strength Improvement | Conductivity Improvement | |------------|---------------------|---------------------------|--------------------------| | **1xxx Series** | 60–75% | 15–25% | 5–10% IACS | | **6xxx Series** | 50–65% | 20–30% | 8–12% IACS | | **5xxx Series** | 45–60% | 25–35% | 6–11% IACS | | **7xxx Series** | 40–55% | 18–28% | 7–13% IACS | --- ### **10. Mechanism of Action** - **Boron Function:** Forms borides (TiB₂, VB₂, CrB₂) removing transition metals from solid solution - **Magnesium Function:** Provides solid solution strengthening and enhances fluidity - **Synergistic Effect:** Magnesium improves wetting and distribution of boride particles - **Nucleation Sites:** Boride particles act as potent heterogeneous nucleation sites --- ### **11. Quality Control Parameters** - Precise Mg:B ratio control (±0.1%) - Homogeneous distribution of boride particles - Consistent grain refinement efficiency - Low gas content (hydrogen < 0.12 ml/100g) - Chemical composition certification --- ### **12. Health, Safety & Handling** - **Standard Precautions:** Generally safe with standard handling procedures - **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 excessive oxidation - **Disposal:** Follow standard metal disposal protocols --- ### **13. Comparison with Other Grain Refiners** | Grain Refiner | Efficiency | Conductivity Impact | Cost | Applications | |---------------|------------|---------------------|------|--------------| | **Al-Mg-B** | Excellent | Improves | Medium | Electrical, Automotive | | **Al-Ti-B** | Excellent | Slight Reduction | Medium | General Purpose | | **Al-B** | Good | Improves | Low | Electrical | | **Al-Ti** | Good | Neutral | Low | General Foundry | --- ### **14. Specialized Applications** **Electrical Conductors (Alloy 1370):** - Maximum electrical conductivity - Good mechanical strength - Excellent drawing characteristics **Automotive Castings (Alloy 356, A356):** - Reduced grain size for improved mechanical properties - Enhanced feeding characteristics - Reduced porosity --- ### **15. Research & Development Trends** - **Optimized Ratios:** Research on ideal Mg:B ratios for specific applications - **Nanoscale Borides:** Control of boride particle size and distribution - **Composite Materials:** Al-Mg-B based composites with enhanced properties - **Additive Manufacturing:** Specialty powders for 3D printing applications - **Recycling Applications:** Improved grain refinement in recycled alloys --- ### **Disclaimer** This information is provided for technical reference only. Properties and performance may vary based on specific application conditions, processing parameters, and base alloy composition. The optimal Mg:B ratio may vary depending on the specific application and base alloy composition. Users are advised to conduct thorough testing to determine suitability for their specific processes. Always follow good foundry 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 2301 gallon liquid totes Special package is available on request.