Aluminium-zinc Master Alloy，Aluminium zinc Alloy，AlZn Alloy，E FORU

**Product Datasheet: Aluminium-Zinc Master Alloy (Al-Zn Alloy)** **Version:** 1.0 | **Date:** 2025-04-02 --- ### **1. General Overview** Aluminium-Zinc Master Alloy (Al-Zn Alloy) is a fundamental and widely used master alloy that forms the basis for the important 7xxx series aluminium alloys. Zinc serves as a primary strengthening element through solid solution strengthening and precipitation hardening, enabling the production of some of the highest strength aluminium alloys available. This master alloy is essential for applications requiring superior strength, toughness, and fatigue resistance. --- ### **2. International Standards** Al-Zn master alloys are governed 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 7xxx series alloys - **JIS:** JIS H 2118 (Aluminium alloy master alloys) - **GB/T:** GB/T 8734 (Aluminium alloy master alloys) - **Typical Master Alloy Grades:** Al-10%Zn, Al-20%Zn, Al-30%Zn, Al-50%Zn, Al-70%Zn --- ### **3. Chemical Composition (Weight %)** Typical composition ranges for Al-Zn master alloy: | Element | Content (%) | Role & Remarks | |------------------------|-------------------|------------------------------------------| | Zinc (Zn) | 5.0 – 70.0 | Primary strengthening element | | Magnesium (Mg) | 0 – 3.0 | Often co-added for precipitation hardening| | Copper (Cu) | 0 – 2.0 | Optional addition for enhanced strength | | Iron (Fe) | ≤ 0.25 | Impurity control | | Silicon (Si) | ≤ 0.20 | Impurity control | | Manganese (Mn) | 0 – 0.30 | Impurity control | | Other Impurities | ≤ 0.15 total | — | | Aluminium (Al) | Balance | Base metal | --- ### **4. Physical Properties** | Property | Value / Range | |---------------------------|-----------------------------------| | Density | 2.9 – 4.2 g/cm³ | | Melting Range | 382 – 660°C (Zn melts at 419.5°C) | | Eutectic Temperature | 382°C | | Intermetallic Phases | MgZn₂, Al₂Mg₃Zn₃, Al₃Mg₃Zn₃ | | Thermal Conductivity | 100 – 150 W/m·K | | Electrical Conductivity | 30 – 45 % IACS | | Vickers Hardness | 60 – 130 HV | | Coefficient of Thermal Expansion | 22–25 × 10⁻⁶/K | --- ### **5. Key Characteristics & Advantages** - **High Strength Potential:** Enables development of ultra-high-strength alloys - **Excellent Age Hardening:** Strong precipitation hardening response - **Good Machinability:** Superior machining characteristics in T6 temper - **Fatigue Resistance:** Excellent fatigue performance in high-strength conditions - **Anodizing Response:** Good surface treatment characteristics - **Casting Performance:** Reasonable castability with proper design --- ### **6. Product Applications** - **Aerospace Structures:** Aircraft frames, wing skins, structural components - **Automotive Components:** Chassis parts, safety components, bumpers - **Sporting Goods:** Bicycle frames, baseball bats, climbing equipment - **Military Applications:** Armor plates, military vehicle components - **Marine Hardware:** Boat fittings, marine structural components - **Industrial Machinery:** High-strength machine parts, tooling plates - **Consumer Products:** High-performance consumer durables --- ### **7. Available Forms** - **Master Alloy:** Ingots, notch bars, waffle plates - **Wrought Products:** Sheet, plate, extrusions, forgings - **Special Forms:** Wire, custom shapes for specific applications - **Standard Sizes:** 5–25 kg ingots --- ### **8. Technical Guidelines for Use** - **Addition Rate:** 1.0–8.0% Zn to the melt (depending on target alloy) - **Melt Temperature:** 700–760°C - **Holding Time:** 30–60 minutes for homogenization - **Stirring:** Moderate mechanical stirring recommended - **Casting Temperature:** 680–740°C - **Heat Treatment:** Solution treatment 460–480°C, aging 100–150°C --- ### **9. Commercial 7xxx Series Alloys** | Alloy | Zn Content (%) | Mg Content (%) | Cu Content (%) | Typical Yield Strength (MPa) | |-------|----------------|----------------|----------------|------------------------------| | **7005** | 4.0–5.0 | 1.0–1.8 | 0.10–0.20 | 290–350 | | **7075** | 5.1–6.1 | 2.1–2.9 | 1.2–2.0 | 450–520 | | **7050** | 5.7–6.7 | 1.9–2.6 | 2.0–2.6 | 490–560 | | **7040** | 5.2–6.2 | 1.6–2.4 | 1.5–2.3 | 430–500 | --- ### **10. Mechanical Properties by Temper** | Temper | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Fatigue Strength (MPa) | |--------|---------------------|-----------------------|----------------|------------------------| | **O** | 150–250 | 250–350 | 10–18 | 100–150 | | **T6** | 450–550 | 500–600 | 5–12 | 150–200 | | **T7** | 400–500 | 450–550 | 7–15 | 170–220 | | **T73** | 380–480 | 430–530 | 8–16 | 180–230 | --- ### **11. Corrosion Performance** | Condition | Stress Corrosion Resistance | Exfoliation Resistance | General Corrosion | |-----------|----------------------------|------------------------|------------------| | **T6** | Poor | Poor | Good | | **T7** | Good | Good | Good | | **T73** | Excellent | Very Good | Good | | **T76** | Very Good | Excellent | Good | --- ### **12. Quality Control Parameters** - Zinc content consistency (±0.2%) - Controlled magnesium and copper ratios - Low gas content (hydrogen < 0.15 ml/100g) - Homogeneous microstructure - Mechanical properties certification --- ### **13. Health, Safety & Handling** - **Standard Handling:** Generally safe with standard precautions - **Fume Control:** Zinc fumes above 500°C require adequate ventilation - **Personal Protection:** Standard foundry PPE required - **Fire Safety:** Normal precautions for aluminium processing - **Storage:** Dry conditions to prevent excessive oxidation - **Disposal:** Follow standard metal disposal protocols --- ### **14. Economic & Supply Considerations** - **Cost-Effective:** Zinc is abundant and economical - **Supply Security:** Excellent global availability - **Processing Efficiency:** Good recovery rates in alloying - **Recycling:** Well-established recycling streams for 7xxx alloys --- ### **15. Specialized Applications Detail** **Aerospace Structures (7075, 7050):** - Highest strength-to-weight ratio - Excellent fatigue performance - Good fracture toughness **Automotive Safety Components:** - High energy absorption capacity - Good impact resistance - Weight reduction potential --- ### **16. Research & Development Trends** - **High-Zinc Alloys:** Development of alloys with >8% Zn content - **Improved Corrosion Resistance:** New tempers with enhanced SCC resistance - **Additive Manufacturing:** 7xxx series powders for 3D printing - **Recycling Technologies:** Improved property retention in recycled alloys - **Multi-functional Alloys:** Combined structural and functional properties --- ### **Disclaimer** This information is provided for technical reference only. Properties and performance may vary based on specific application conditions, processing parameters, and temper conditions. Al-Zn alloys, particularly 7xxx series, require careful control of composition and heat treatment to achieve optimal properties and corrosion resistance. Users are advised to conduct thorough testing to determine suitability for their specific applications, particularly regarding stress corrosion cracking resistance in high-strength tempers. Always follow good manufacturing practices and safety guidelines, and consult with materials engineering specialists for critical applications in aerospace and automotive 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 2324 gallon liquid totes Special package is available on request.