Magnesium AZ92A-T5, Cast,E FOUR

### **Product Datasheet: Magnesium Alloy AZ92A-T5 (Cast), UNS M11920** --- #### **1. Overview** Magnesium Alloy AZ92A-T5 is a high-strength magnesium-aluminum-zinc casting alloy supplied in the artificially aged condition. The **"T5"** temper designation indicates that castings have undergone **artificial aging only**, without prior solution heat treatment. This thermal treatment improves the alloy's mechanical properties, particularly yield strength and hardness, while maintaining good dimensional stability. --- #### **2. Key Advantages** - **Improved Strength:** Enhanced yield strength and hardness compared to as-cast condition - **Good Dimensional Stability:** Minimal distortion during aging treatment - **Cost-Effective:** Lower cost than full T6 treatment - **Good Machinability:** Excellent machining characteristics - **Improved Stress Relief:** Effective reduction of residual casting stresses --- #### **3. Chemical Composition (Weight % per ASTM B80)** | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Aluminum (Al)** | 8.3 - 9.7 | **Zinc (Zn)** | 1.6 - 2.4 | | **Manganese (Mn)** | 0.10 - 0.35 | **Silicon (Si)** | ≤ 0.30 | | **Copper (Cu)** | ≤ 0.25 | **Iron (Fe)** | ≤ 0.05 | | **Nickel (Ni)** | ≤ 0.03 | **Other Impurities** | ≤ 0.30 | | **Magnesium (Mg)** | Balance | | | *Note: The higher zinc content (1.6-2.4%) compared to AZ91 alloys enables effective precipitation hardening during artificial aging.* --- #### **4. Physical & Mechanical Properties (Typical for Sand Cast T5 Temper)** | Property | Metric Unit | Imperial Unit | |----------|-------------|--------------| | **Density** | 1.82 g/cm³ | 0.066 lb/in³ | | **Melting Range** | 450 - 595 °C | 842 - 1103 °F | | **Ultimate Tensile Strength** | 180 - 210 MPa | 26 - 30 ksi | | **Tensile Yield Strength (0.2%)** | 120 - 140 MPa | 17 - 20 ksi | | **Elongation (in 50mm)** | 2 - 4 % | 2 - 4 % | | **Compressive Yield Strength** | 120 - 140 MPa | 17 - 20 ksi | | **Hardness (Brinell)** | 70 - 80 HB | 70 - 80 HB | | **Modulus of Elasticity** | 45 GPa | 6.5 × 10⁶ psi | | **Shear Strength** | 120 - 135 MPa | 17 - 20 ksi | | **Fatigue Strength** | 80 - 95 MPa | 12 - 14 ksi | --- #### **5. Heat Treatment Parameters** - **Aging Temperature:** 215°C ± 5°C (420°F ± 10°F) - **Aging Time:** 4-16 hours - **Cooling Method:** Air cooling - **Microstructure:** Precipitates formed from supersaturated solid solution --- #### **6. International Standards** - **ASTM International:** - **ASTM B80:** Standard Specification for Magnesium-Alloy Sand Castings - **ASTM B199:** Standard Specification for Magnesium-Alloy Permanent Mold Castings - **SAE International:** - **SAE AMS 4432:** Magnesium Alloy Castings, Sand 9Al-2Zn (AZ92A) - **Unified Numbering System (UNS):** - **UNS M11920** - **ISO Standards:** - **ISO 16220:** Magnesium and magnesium alloys - Cast products --- #### **7. Product Applications** AZ92A-T5 is suitable for applications requiring improved strength and dimensional stability: - **Automotive Components:** - Transmission housings - Engine brackets - Suspension components - Wheel components - **Industrial Equipment:** - Machinery bases and frames - Pump housings - Compressor components - Material handling parts - **Aerospace Applications:** - Non-critical structural brackets - Accessory mounts - Instrument housings - **Consumer Products:** - High-performance power tool housings - Sporting equipment components - Professional audio equipment parts --- #### **8. Technical Considerations** - **Aging Response:** Good response to artificial aging due to zinc content - **Corrosion Protection:** Requires surface treatments for corrosive environments - **Machinability:** Excellent - improved chip formation compared to as-cast material - **Dimensional Changes:** Minimal during aging treatment - **Weldability:** Fair - properties in heat-affected zone may be affected --- #### **9. Comparison with Other Tempers** - **vs. F (As-Cast):** 25-30% higher yield strength, improved hardness - **vs. T4 (Solution Treated):** Higher strength but lower ductility - **vs. T6 (Solution & Aged):** Lower strength but more cost-effective - **vs. AZ91A-T5:** Higher strength due to increased zinc content --- #### **10. Manufacturing Guidelines** - **Casting Methods:** Suitable for sand and permanent mold casting - **Aging Process:** Can be performed immediately after casting - **Quality Control:** Hardness testing effective for quality verification - **Post-Machining:** Can be machined after aging treatment --- **Disclaimer:** This information is for reference purposes only. Properties may vary based on casting method, section size, and specific aging parameters. For applications requiring maximum ductility and impact strength, consider specifying AZ92A-T4 temper. For maximum strength, specify AZ92A-T6. Always consult certified test data for critical applications.

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 3324 gallon liquid totes Special package is available on request.