2024-T861 Aluminum alloy,Aluminum 2024-T861 alloy,E FORU

### **Aluminum 2024-T861 Alloy Product Introduction** **Overview** 2024-T861 is a premium-grade aluminum-copper alloy that has undergone an advanced thermal-mechanical treatment process to achieve superior mechanical properties. The T861 temper designation indicates the material has been solution heat-treated, substantially cold worked (typically 6-8% permanent set), and artificially aged to develop maximum strength characteristics while maintaining adequate toughness for critical aerospace applications. --- #### **1. Chemical Composition** | Element | Content (%) | |---------|-------------| | **Aluminum (Al)** | Balance | | **Copper (Cu)** | 3.8 - 4.9 | | **Magnesium (Mg)** | 1.2 - 1.8 | | **Manganese (Mn)** | 0.30 - 0.9 | | **Iron (Fe)** | ≤ 0.20 | | **Silicon (Si)** | ≤ 0.15 | | **Zinc (Zn)** | ≤ 0.10 | | **Chromium (Cr)** | ≤ 0.10 | | **Other Elements** | ≤ 0.15 total | --- #### **2. Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | 2.78 g/cm³ (0.100 lb/in³) | | **Melting Range** | 500°C - 638°C (932°F - 1180°F) | | **Electrical Conductivity** | 28-33% IACS | | **Thermal Conductivity** | 115-125 W/m·K | | **Coefficient of Thermal Expansion** | 23.2 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 73.1 GPa (10,600 ksi) | | **Poisson's Ratio** | 0.33 | --- #### **3. Mechanical Properties** **Typical Mechanical Properties:** | Property | Value | |----------|-------| | **Tensile Strength** | 480-520 MPa (70-75 ksi) | | **Yield Strength (0.2% Offset)** | 420-460 MPa (61-67 ksi) | | **Elongation in 2 inches** | 5-7% | | **Shear Strength** | 290-315 MPa (42-46 ksi) | | **Fatigue Strength** | 150 MPa (22 ksi) | | **Brinell Hardness** | 140-150 HB | | **Compressive Yield Strength** | 420-460 MPa (61-67 ksi) | | **Fracture Toughness** | 21-25 MPa√m | --- #### **4. International Standards** | Standard System | Designation | Product Form | |-----------------|-------------|--------------| | **ASTM** | ASTM B209 | Plate | | **AMS** | AMS 4080 | Plate | | **AMS** | AMS 4201 | Rolled Ring | | **MIL** | MIL-DTL-6075 | Plate | | **EN** | EN AW-2024A [T861] | Plate | --- #### **5. Product Applications** **Critical Aerospace Structures:** - Primary aircraft wing compression members - Lower wing skins and planks - Fuselage bulkheads and frames - Landing gear support components - Space launch vehicle structures **Defense Applications:** - Military aircraft primary load-bearing structures - Missile airframes and wings - Armored vehicle structural components - Defense system mounting platforms **High-Performance Applications:** - Racing car monocoque structures - High-stress machined components - Critical structural fittings - Applications requiring maximum strength-to-weight ratio --- #### **6. Key Advantages & Considerations** **Advantages:** - ✅ **Maximum Strength Development** in 2024 alloy system - ✅ **Exceptional Strength-to-Weight Ratio** - ✅ **Superior Fatigue Performance** - ✅ **Enhanced Stress-Corrosion Resistance** - ✅ **Excellent Dimensional Stability** - ✅ **Optimal Bearing Strength** **Considerations:** - ⚠️ **Limited Ductility** requires specialized manufacturing - ⚠️ **Minimal Formability** after final processing - ⚠️ **Advanced Machining Techniques** required - ⚠️ **Premium Cost** due to complex processing - ⚠️ **Anisotropic Properties** must be considered in design - ⚠️ **Welding Not Recommended** --- **Processing Characteristics** **T861 Thermal-Mechanical Treatment:** 1. **Solution Heat Treatment:** - Temperature: 490-500°C (915-932°F) - Precision temperature control - Rapid quenching 2. **Substantial Cold Working:** - 6-8% permanent stretch - Precisely controlled deformation process - Advanced stress management 3. **Artificial Aging:** - Optimized temperature-time parameters - Enhanced precipitation hardening - Final microstructure stabilization --- **Quality Assurance** **Comprehensive Testing:** - Full mechanical property verification - Advanced ultrasonic inspection - Stress-corrosion cracking evaluation - Microstructural analysis - Fracture toughness validation - Dimensional accuracy verification --- **Conclusion** 2024-T861 Aluminum Alloy represents the pinnacle of strength optimization in the 2024 alloy system, delivering the highest mechanical properties achievable through advanced thermal-mechanical processing. The substantial cold working (6-8% stretch) combined with optimized artificial aging produces exceptional strength characteristics that are essential for the most critical aerospace and defense applications. While demanding sophisticated manufacturing expertise and representing a premium investment, its unparalleled performance in primary load-bearing structures justifies its selection where maximum structural efficiency is paramount. The alloy's combination of peak strength, excellent fatigue resistance, and enhanced stress-corrosion cracking performance establishes it as the material of choice for engineers designing mission-critical components where reliability and performance cannot be compromised.

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 1550 gallon liquid totes Special package is available on request.