Alclad 6061-T6, T651 Aluminum alloy,Aluminum 6061-T6, T651 alloy,E FORU

### **Alclad 6061-T6 / T651 Aluminum Alloy: Product Introduction** **Overview** Alclad 6061-T6/T651 represents the peak performance variant of the widely used 6061 aluminum alloy, combining maximum strength with exceptional corrosion protection. This composite material consists of a 6061 core in the T6 or T651 temper, metallurgically bonded to a surface layer of high-purity aluminum. The **T6 temper** (Solution Heat-Treated and Artificially Aged) provides the **highest practical strength and hardness**, while the **T651 temper** indicates additional stress-relieving through stretching for superior dimensional stability. The Alclad coating serves as a **sacrificial anode**, ensuring long-term protection against corrosion even in aggressive environments. --- #### **1. Chemical Composition** The material maintains precise chemical control for both core and cladding components. | Component | Description | Key Characteristics | | :--- | :--- | :--- | | **Core Material** | **6061 Aluminum Alloy** | Standard composition: Si 0.4-0.8%, Fe (max) 0.7%, Cu 0.15-0.4%, Mn (max) 0.15%, Mg 0.8-1.2%, Cr 0.04-0.35%, Zn (max) 0.25%, Ti (max) 0.15%, Al Balance. | | **Cladding Material** | High-Purity Aluminum (typically 1050, 1100, or 7072 alloy) | The cladding layer represents 2.5-5% of total thickness per side, providing galvanic protection to the core material. | --- #### **2. Physical Properties** The physical properties reflect the characteristics of the 6061 core material. | Property | Typical Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | 2.70 g/cm³ | 0.0975 lb/in³ | | **Melting Range** | 580 - 650 °C | 1075 - 1200 °F | | **Electrical Conductivity** | 43-47% IACS | 43-47% IACS | | **Thermal Conductivity** | 167-175 W/m·K | 970-1015 BTU·in/(hr·ft²·°F) | | **Coefficient of Thermal Expansion (20-100°C)** | 23.6 × 10⁻⁶/°C | 13.1 × 10⁻⁶/°F | --- #### **3. Mechanical Properties (T6/T651 Temper)** The T6/T651 condition delivers optimal mechanical performance for structural applications. | Property | Metric Value | Imperial Value | | :--- | :--- | :--- | | **Tensile Strength** | 290-310 MPa | 42-45 ksi | | **Yield Strength (0.2% Offset)** | 240-260 MPa | 35-38 ksi | | **Elongation (in 50mm)** | 8-12% | 8-12% | | **Hardness (Brinell)** | 95-100 HB | 95-100 HB | | **Fatigue Strength** | 95-100 MPa | 14-15 ksi | **Temper Designation Clarification:** - **T6**: Solution heat-treated and artificially aged to peak strength - **T651**: Solution heat-treated, stress-relieved by stretching (1-3% permanent set), and artificially aged. This provides enhanced dimensional stability for machining operations. --- #### **4. International Standards** Alclad 6061-T6/T651 is specified in major international standards. * **ASTM (USA):** * ASTM B209: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate * ASTM B221: Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes * **AMS (Aerospace Material Specification):** * AMS 4027: Alclad 6061-T6 Sheet * AMS 4049: Alclad 6061-T651 Plate * AMS 4087: Alclad 6061-T651 Sheet * **ISO (International Organization for Standardization):** * ISO 6361-2: Wrought aluminum and aluminum alloy sheets, strips and plates * ISO 6362-2: Wrought aluminum and aluminum alloy extruded rods/bars, tubes and profiles --- #### **5. Product Applications** Alclad 6061-T6/T651 is specified for critical applications requiring maximum strength and corrosion resistance. * **Aerospace Structures:** * Aircraft wing skins and fuselage panels * Structural ribs and bulkheads * Landing gear components * Space vehicle structures * **Marine Engineering:** * Ship superstructures and hull components * Offshore platform modules * Marine crane components * **Defense Applications:** * Armored vehicle components * Military bridge systems * Weapon system mounts * **Transportation:** * High-speed train body panels * Heavy-duty truck frames * Racing vehicle chassis --- #### **6. Key Characteristics & Advantages** * **Optimum Strength-to-Weight Ratio:** Provides the highest strength capability of the 6061 alloy system while maintaining aluminum's inherent lightweight advantage * **Superior Corrosion Resistance:** The Alclad layer offers sacrificial protection, significantly outperforming bare 6061-T6 in corrosive environments * **Excellent Stress Corrosion Cracking Resistance:** The T6/T651 temper provides enhanced resistance to stress corrosion cracking * **Good Machinability (T651):** The stress-relieved T651 temper allows for precise machining with minimal distortion * **Maintained Weldability:** While welding affects the T6 temper in the heat-affected zone, the material remains weldable using standard aluminum welding techniques * **Excellent Fatigue Performance:** Demonstrates superior fatigue resistance compared to lower tempers **Technical Notes:** - The Alclad layer typically reduces the overall strength by approximately 2-4% compared to bare 6061-T6 - Stress-relieving in the T651 temper is particularly beneficial for large structural components and precision parts - The material can be further enhanced with various surface treatments and coatings while maintaining the Alclad protection This material combination represents the premium choice for engineers requiring the full performance potential of 6061 aluminum with maximum environmental durability.

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 1992 gallon liquid totes Special package is available on request.