Alclad 6061-T4, T451 Aluminum alloy,Aluminum 6061-T4, T451 alloy,E FORU

### **Alclad 6061-T4 / T451 Aluminum Alloy: Product Introduction** **Overview** Alclad 6061-T4/T451 is a high-performance composite material featuring a core of 6061 aluminum alloy in the T4 or T451 temper, metallurgically clad with a thin layer of high-purity aluminum. The **T4 temper** (Solution Heat-Treated and Naturally Aged) provides a combination of **good strength and excellent ductility**, ideal for forming operations. The **T451 temper** specifically indicates the material has been stress-relieved by stretching after solution heat treatment to improve dimensional stability for machining. The Alclad layer offers **superior sacrificial corrosion resistance**, making this product a premium choice for aerospace and marine structures that require formability, intermediate strength, and long-term durability. --- #### **1. Chemical Composition** The composition is defined for both the core and the cladding layer. | Component | Description | Key Characteristics | | :--- | :--- | :--- | | **Core Material** | **6061 Aluminum Alloy** | Standard 6061 chemistry: 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 (e.g., 1050, 1100, or 7072 alloy) | The cladding is electrochemically anodic to the core. It corrodes sacrificially, protecting the strong 6061 core from pitting and intergranular attack, even if the surface is scratched. | --- #### **2. Physical Properties** The physical properties are dominated by the 6061 core. | Property | Typical Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | ~2.71 g/cm³ | ~0.098 lb/in³ | | **Melting Range** | ~ 580 - 650 °C | ~ 1075 - 1200 °F | | **Electrical Conductivity** | ~ 47-50% IACS | ~ 47-50% IACS | | **Thermal Conductivity** | ~ 170 - 190 W/m·K | ~ 990 - 1100 BTU·in/(hr·ft²·°F) | | **Coefficient of Thermal Expansion (20-100°C)** | 23.6 x 10⁻⁶ /°C | 13.1 x 10⁻⁶ /°F | --- #### **3. Mechanical Properties (Typical for T4/T451 Temper)** The T4/T451 temper provides a balanced set of properties between the annealed (O) and fully hardened (T6) states. | Property | Metric Value (Typical) | Imperial Value (Typical) | | :--- | :--- | :--- | | **Tensile Strength** | ~ 205 - 240 MPa | ~ 30 - 35 ksi | | **Yield Strength (0.2% Offset)** | ~ 110 - 145 MPa | ~ 16 - 21 ksi | | **Elongation (in 50mm)** | ~ 16 - 22 % | ~ 16 - 22 % | | **Hardness (Brinell)** | ~ 60 - 70 HB | ~ 60 - 70 HB | **Note on Tempers:** * **T4:** Solution Heat-Treated and Naturally Aged. This is the baseline condition with good formability. * **T451:** Solution Heat-Treated, Stress-Relieved by Stretching, and Naturally Aged. The stretching process (typically 1-3% permanent set) minimizes residual quenching stresses, which is critical for **dimensional stability during subsequent machining**. T451 is the preferred temper for parts that will be heavily machined. --- #### **4. International Standards** This Alclad product is rigorously defined in aerospace and industry standards. * **ASTM (USA):** * **ASTM B209:** Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate. * **AMS (Aerospace Material Specification):** * **AMS 4035:** Covers Alclad 6061-T4 Sheet. * **AMS 4045:** Covers Alclad 6061-T451 Plate. * **AMS 4085:** Covers Alclad 6061-T451 Sheet. * **ISO (International Organization for Standardization):** * While not as common, equivalent materials can be found in standards like **ISO 6361** for wrought sheet and plate. --- #### **5. Product Applications** Alclad 6061-T4/T451 is primarily used in high-reliability industries where its unique combination of properties is essential. * **Aerospace Industry (Primary Application):** * **Aircraft Fuselage Skins and Panels:** Formed in the T4 state, often before final aging to T6. * **Wing and Empennage Components** * **Bulkheads and Frames** (particularly in T451 temper for machining stability). * **Internal Structural Members** * **Marine and Shipbuilding:** * **Superstructure Panels** * **Decking and Hatches** * **Military Vehicles:** * **Armored Vehicle Hulls and Body panels** where corrosion resistance and formability are critical. * **High-End Transportation and Racing:** * **Chassis components and bodywork.** --- #### **6. Key Characteristics & Advantages** * **Excellent Combination of Strength and Formability:** The T4 temper is significantly stronger than the O temper while retaining high ductility for forming complex shapes. * **Superior Sacrificial Corrosion Protection:** The Alclad layer provides robust, long-term protection against atmospheric and stress corrosion, safeguarding the structural integrity of the 6061 core. * **Dimensional Stability (T451):** The T451 temper is essential for components that require precise machining, as it prevents warping caused by the release of internal stresses. * **Age-Hardenable:** Components formed in the T4 state can be artificially aged (to a T6 temper) to achieve significantly higher strength for the final application. * **Excellent Weldability:** It can be readily welded using TIG and MIG methods, though the heat will affect the temper and corrosion properties in the Heat-Affected Zone (HAZ). * **Proven Aerospace Reliability:** This material combination has a long history of successful performance in the most demanding environments. **Disclaimer:** The information provided is typical and for reference purposes. The T451 temper is specifically designed for machined parts and is a critical specification for aerospace designs. For all critical applications, the relevant AMS or ASTM standards must be consulted for definitive requirements regarding mechanical properties, clad ratio, and quality assurance.

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 1991 gallon liquid totes Special package is available on request.