Alclad 6061-O Aluminum alloy,Aluminum 6061-O alloy,E FORU

### **Alclad 6061-O Aluminum Alloy: Product Introduction** **Overview** Alclad 6061-O is a composite material consisting of a core of 6061-O aluminum alloy metallurgically bonded to a surface layer of high-purity aluminum or a low-potency aluminum alloy. The "O" temper denotes the "Annealed" condition, which provides the **softest state and maximum ductility**. The primary purpose of the Alclad layer is to provide **superior corrosion protection** to the high-strength 6061 core, making this product ideal for applications where extreme formability and long-term corrosion resistance are paramount, even in highly aggressive environments. --- #### **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 anodic to the core. In the event of surface damage or exposure, the cladding corrodes sacrificially, protecting the strong 6061 core from pitting and intergranular attack. Typically, the cladding constitutes 5-10% of the total thickness on each side. | --- #### **2. Physical Properties** The physical properties are dominated by the 6061-O 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 O Temper)** The "O" (Annealed) temper represents the softest and most formable state. The mechanical properties are relatively low but sufficient for deep forming operations. | Property | Metric Value (Typical) | Imperial Value (Typical) | | :--- | :--- | :--- | | **Tensile Strength** | ~ 125 - 165 MPa | ~ 18 - 24 ksi | | **Yield Strength (0.2% Offset)** | ~ 55 - 95 MPa | ~ 8 - 14 ksi | | **Elongation (in 50mm)** | ~ 20 - 25 % | ~ 20 - 25 % | | **Hardness (Brinell)** | ~ 30 - 35 HB | ~ 30 - 35 HB | **Note:** A key advantage of starting with Alclad 6061-O is that it can be formed into complex shapes and then subsequently **solution heat-treated and aged (to a T4 or T6 temper)** to develop high strength while retaining the sacrificial corrosion protection of the cladding. --- #### **4. International Standards** Alclad products are covered under specific standards that define the core, cladding, and bond quality. * **ASTM (USA):** * **ASTM B209:** Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate. This is the primary standard, specifying requirements for Alclad 6061 sheet. * **AMS (Aerospace Material Specification):** * **AMS 4025:** Covers Alclad 6061-O Sheet. * **AMS 4045:** Covers Alclad 6061-O Plate. * **ISO (International Organization for Standardization):** * While not as commonly specified by the "Alclad" name, ISO standards like **ISO 6361** for wrought sheet and plate have equivalent material designations for clad products. --- #### **5. Product Applications** Alclad 6061-O is specified for applications requiring severe forming followed by heat treatment and exposure to corrosive environments. * **Aerospace Industry:** The primary application. * **Aircraft Skins and Fuselage Panels:** Formed in the O-temper and then heat-treated. The cladding protects against atmospheric and stress corrosion. * **Fuel Tanks and Structural Components** * **Marine and Offshore Applications:** * **Hull and Superstructure Panels** for boats and ships. * **Components exposed to salt spray.** * **Chemical Processing Equipment:** * **Vessels, Covers, and Ductwork** that require corrosion resistance and complex shapes. * **Architectural Applications:** * For severe forming applications in marine or industrial environments where a painted finish will be applied. --- #### **6. Key Characteristics & Advantages** * **Superior Corrosion Resistance:** The core alloy is cathodically protected by the sacrificial Alclad layer, offering exceptional resistance to pitting and exfoliation corrosion, even if the surface is scratched. * **Maximum Formability and Ductility:** The O-temper allows for the most severe bending, stretching, and drawing operations without cracking, which is essential for creating complex aerospace and marine components. * **Heat-Treatable:** After forming, the component can be solution heat-treated and aged to develop the high strength (T6 properties) of the 6061 core, creating a strong, durable, and corrosion-resistant final part. * **Excellent Bond Integrity:** The cladding is metallurgically bonded to the core, ensuring it will not peel, flake, or separate during forming or in service. * **Good Weldability:** The material can be welded, though the process will locally affect both the cladding and the core's temper and corrosion properties in the Heat-Affected Zone (HAZ). **Disclaimer:** The information provided is typical and for reference purposes. The properties and thickness of the cladding layer are critical design parameters. For aerospace and other critical applications, the relevant AMS or ASTM standards must be consulted for definitive requirements regarding clad ratio, bond strength, and guaranteed mechanical properties.

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 1990 gallon liquid totes Special package is available on request.