Aluminium-strontium-titanium-boron Master Alloy，Aluminium-strontium-titanium-boron Alloy，AlSrTiB Alloy，E FORU

**Product Datasheet: Aluminium-Strontium-Titanium-Boron Master Alloy (Al-Sr-Ti-B Alloy)** **Version:** 1.0 | **Date:** 2025-04-02 --- ### **1. General Overview** Aluminium-Strontium-Titanium-Boron Master Alloy (Al-Sr-Ti-B Alloy) is an advanced multi-functional master alloy that combines the benefits of eutectic modification and grain refinement in a single addition. This complex master alloy integrates strontium's superior silicon modification capabilities with titanium and boron's exceptional grain refining properties, providing comprehensive microstructural control for premium aluminium-silicon casting alloys. It represents the cutting edge of foundry technology for high-performance applications. --- ### **2. International Standards** Al-Sr-Ti-B master alloys are specified in several 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) - **GB/T:** GB/T 8734 (Aluminium alloy master alloys) - **Typical Master Alloy Grades:** Al-5Sr-3Ti-1B, Al-10Sr-5Ti-1B, Al-10Sr-3Ti-1B, Al-8Sr-5Ti-1.5B --- ### **3. Chemical Composition (Weight %)** Typical composition ranges for Al-Sr-Ti-B master alloy: | Element | Content (%) | Role & Remarks | |---------------------|-------------------|------------------------------------------| | Strontium (Sr) | 3.0 – 12.0 | Eutectic silicon modification | | Titanium (Ti) | 2.0 – 6.0 | Grain refinement, intermetallic formation| | Boron (B) | 0.5 – 2.0 | Grain refinement, TiB₂ formation | | Calcium (Ca) | ≤ 0.03 | Critical impurity control | | Iron (Fe) | ≤ 0.20 | Impurity control | | Silicon (Si) | ≤ 0.15 | Impurity control | | Other Impurities | ≤ 0.08 total | — | | Aluminium (Al) | Balance | Base metal | --- ### **4. Physical Properties** | Property | Value / Range | |---------------------------|-----------------------------------| | Density | 2.9 – 3.3 g/cm³ | | Melting Range | 660 – 1050°C | | Intermetallic Phases | TiB₂, Al₃Ti, Al₄Sr, Al₂TiSr | | Thermal Conductivity | 90 – 130 W/m·K | | Electrical Conductivity | 25 – 40 % IACS | | Vickers Hardness | 80 – 150 HV | | Coefficient of Thermal Expansion | 20–23 × 10⁻⁶/K | --- ### **5. Key Characteristics & Advantages** - **Dual Functionality:** Simultaneous grain refinement and eutectic modification - **Superior Microstructure:** Combines fine grains with modified silicon - **Enhanced Mechanical Properties:** Superior strength and ductility combination - **Process Efficiency:** Single addition replaces multiple treatment steps - **Improved Castability:** Better fluidity and reduced hot tearing - **Consistent Results:** Highly reproducible microstructural control --- ### **6. Product Applications** - **Premium Automotive Castings:** Engine blocks, cylinder heads, structural components - **Aerospace Components:** Critical structural castings, landing gear parts - **High-Performance Pistons:** Racing and heavy-duty engine pistons - **Military Equipment:** Armored vehicle components, weapon systems - **Pressure-Tight Castings:** Hydraulic components, pump housings - **Electrical Rotors:** High-efficiency motor rotors - **Tooling Applications:** Molds and dies requiring superior properties --- ### **7. Available Forms** - **Master Alloy:** Ingots, notch bars, waffle plates - **Special Forms:** Rods, customized shapes for automated feeding - **Standard Sizes:** 5–12 kg ingots - **Tailored Compositions:** Custom Sr:Ti:B ratios for specific applications --- ### **8. Technical Guidelines for Use** - **Addition Rate:** 0.5–2.0% master alloy to the melt - **Melt Temperature:** 730–780°C - **Holding Time:** 30–50 minutes for complete reaction - **Stirring:** Moderate mechanical stirring recommended - **Treatment Window:** Effective for 4–8 hours after addition - **Cooling Rate:** Controlled solidification for optimal structure --- ### **9. Microstructural Performance** | Treatment Type | Grain Size (μm) | Silicon Morphology | SDAS* (μm) | Porosity Reduction | |----------------|----------------|-------------------|------------|-------------------| | **Unmodified** | 200–400 | Acicular | 40–60 | Baseline | | **Sr Only** | 180–350 | Fibrous | 35–55 | 30–40% | | **Ti-B Only** | 80–150 | Acicular | 30–50 | 20–30% | | **Al-Sr-Ti-B** | 50–100 | Fine Fibrous | 20–35 | 50–70% | *SDAS: Secondary Dendrite Arm Spacing --- ### **10. Mechanical Property Enhancement** | Treatment | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Quality Index | |-----------|---------------------|---------------------|----------------|---------------| | **Unmodified** | 180–220 | 130–160 | 2–4 | 200–250 | | **Sr Modified** | 200–240 | 140–170 | 6–10 | 280–330 | | **Ti-B Refined** | 210–250 | 150–180 | 3–6 | 260–300 | | **Al-Sr-Ti-B** | 240–290 | 170–200 | 8–14 | 350–420 | --- ### **11. Quality Control Parameters** - Precise Sr:Ti:B ratio control (±0.1%) - Ti:B ratio maintained at 5:1 for optimal TiB₂ formation - Homogeneous intermetallic distribution - Low gas content (hydrogen < 0.12 ml/100g) - Microstructural certification --- ### **12. Health, Safety & Handling** - **Pyrophoric Risk:** Strontium-containing fines may be pyrophoric - **Dust Control:** Avoid inhalation of fine particles during processing - **Personal Protection:** Wear gloves, safety glasses, and protective clothing - **Ventilation:** Adequate fume extraction during addition - **Fire Safety:** Class D fire extinguisher required in processing areas - **Storage:** Sealed containers in dry, well-ventilated areas --- ### **13. Synergistic Effects** - **Ti-B System:** Forms TiB₂ particles for heterogeneous nucleation - **Strontium:** Modifies eutectic silicon morphology - **Combined Action:** Enhanced grain refinement through Sr-Ti interactions - **Microstructural Synergy:** Fine grains with well-modified eutectic structure --- ### **14. Economic Benefits** - **Process Simplification:** Single addition replaces multiple treatments - **Quality Improvement:** Reduced scrap and improved yield - **Performance Premium:** Superior properties command higher prices - **Energy Efficiency:** Lower processing temperatures and times --- ### **15. Research & Development Trends** - **Nanoscale Engineering:** Control of TiB₂ particle size and distribution - **Multi-element Optimization:** Development of optimal Sr:Ti:B ratios - **Additive Manufacturing:** Specialized powders for 3D printing applications - **Recycling Compatibility:** Performance in recycled alloy systems - **Process Monitoring:** Real-time microstructural control systems --- ### **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 complex nature of this multi-element master alloy requires careful process control and optimization for each specific application. Users are advised to conduct thorough testing to determine optimal addition rates and processing parameters. Strict safety protocols must be followed due to the pyrophoric nature of strontium-containing materials. Always consult with materials engineering specialists for critical applications in automotive, aerospace, and military sectors.

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 2315 gallon liquid totes Special package is available on request.