7178 T7651 Aluminum Plate

7178-T7651 aluminum alloy is a high-strength aluminum material that undergoes specific heat treatment and aging processes to enhance its corrosion resistance and mechanical properties. After solution heat treatment, 7178-T7651 aluminum is stress-relieved and artificially aged to stabilize its properties and improve durability.

7178 T7651 has the following standard names and specifications:

Plate/Sheet; 7178 T7651, ASTM B209, ISO AlZn7MgCu, UNS A97178, AMS QQ-A-250/14

7178 T7651 aluminum alloy has outstanding strength, making it suitable for high-strength aerospace structures. However, its workability is relatively low, and its weldability is fair. It performs well in formability and corrosion resistance, and heat treatment can be applied to further improve its properties.

7178 T7651 Aluminum Alloy Composition

7178 aluminum alloy belongs to the 7 series of aluminum alloys and is primarily composed of aluminum and zinc (Zn) as the main alloying elements. It may also contain small amounts of copper, magnesium, chromium, and other elements. The combination of these alloying elements gives 7178 aluminum alloy extremely high strength and corrosion resistance, making it suitable for demanding aerospace and military applications.

T7651 Heat Treatment Condition

The 7178 aluminum alloy in the T7651 condition achieves its excellent performance through the following heat treatment steps:

• Solution Heat Treatment: This involves heating the alloy to a high temperature to dissolve the elements in the alloy into the solid phase, achieving uniform alloying.
• Stress Relieving: This process involves stretching the metal to release any internal stresses that may have developed during processing. The degree of stretching is adjusted to suit different types of forged products (such as thin sheets, plates, rods, or forgings).
• Over-aging: The alloy undergoes an artificial aging process to further enhance its mechanical properties, particularly to improve resistance to exfoliation corrosion. The degree of aging is crucial to the final performance of the alloy.

7178 T7651 Aluminum Plate Performance

• Tensile Strength: 7178-T7651 aluminum alloy has excellent tensile strength, making it suitable for high-load applications, especially in the aerospace field.
• Corrosion Resistance: Due to the over-aging process, 7178-T7651 aluminum exhibits high resistance to exfoliation corrosion, which ensures a long service life even in harsh environments.
• Hardness: This alloy has high hardness in the T7651 condition, maintaining stability under high strength and wear-resistance conditions.

7178 T7651 Aluminum Plate Applications

• Aerospace: 7178-T7651 aluminum alloy is widely used in the aerospace industry, particularly in the manufacture of high-strength fasteners. For example, the outer skin of aircraft wings often uses this alloy because its high strength and corrosion resistance ensure the structural integrity and durability of the aircraft.
• Fasteners: As a high-strength aluminum alloy, it is used in the manufacture of fasteners for aircraft, rockets, and other structures, such as bolts, nuts, and other structural components that need to withstand extreme mechanical loads and stresses.
• Construction Industry: Although primarily used in aerospace, 7178-T7651 aluminum alloy is also applied in the construction industry, especially in high-strength and corrosion-resistant structural applications.

7178 T7651 Aluminum Workability and Welding

• Workability: 7178 aluminum alloy has good workability, but its high strength may affect its ability to deform during processing. Therefore, precision forming is often achieved through machining, cooling cutting, and other techniques.
• Welding: Although 7178 aluminum alloy does not have the same weldability as some other aluminum alloys, it can be welded and joined using appropriate welding processes and material selection.

7178 T7651 Aluminum Advantages

• High Strength: 7178-T7651 aluminum alloy provides higher strength than other aluminum alloys, offering sufficient support for aerospace applications where weight is critical.
• Corrosion Resistance: Its unique over-aging treatment enables excellent performance in exfoliation corrosion, making it ideal for use in high-humidity, salt mist, or other corrosive environments.
• Versatility: Although primarily used in aerospace, its excellent physical and mechanical properties make it suitable for applications in construction and other industries with high-performance requirements.

7178-T7651 aluminum alloy is a high-strength material with excellent corrosion resistance, widely used in the aerospace industry for manufacturing high-strength fasteners, aircraft wing skins, and other critical components. Through solution heat treatment, stress relieving, and over-aging, it ensures outstanding durability and stability while maintaining superior mechanical properties.

7178 T7651 Aluminum Material Property Data Sheet