7178 T73511 aluminum alloy is a high-strength material belonging to the Al-Zn-Mg-Cu based 7xxx series alloys and is widely used in aerospace, defense, and high-performance engineering applications. The T73511 temper represents a special overaging heat treatment designed to improve resistance to stress corrosion cracking. As a result, 7178 T73511 provides a balanced combination of very high strength and improved corrosion resistance. The alloy is commonly used in structural components, aircraft fuselage parts, high-load fasteners, and defense industry equipment.

One of the most significant characteristics of the 7178 T73511 alloy is its very high mechanical strength. The tensile strength of this alloy is considerably higher than many other aluminum alloys and can approach steel-like strength levels in certain applications. When compared with alloys such as 7075, 7050, and 2024, the 7178 alloy often provides higher tensile strength. Additionally, thanks to the T73511 temper condition, it demonstrates better resistance to stress corrosion cracking compared to harder tempers such as 7075-T6. This makes it particularly advantageous for aerospace components operating under high stress.

From a corrosion resistance perspective, the 7178 T73511 alloy has been optimized to provide improved resistance to stress corrosion cracking, which is a common concern for many 7xxx series alloys. The special temper significantly reduces the susceptibility to this type of corrosion. However, its general atmospheric corrosion resistance can be slightly lower than alloys from the 6xxx series, such as 6061. For this reason, surface treatments such as anodizing, painting, or protective coatings are commonly applied to enhance durability.

In terms of machinability, 7178 T73511 performs very well in machining processes. It offers stable cutting behavior and can produce high-quality surface finishes despite its high strength. However, due to its high strength level, its bending and forming capability can be somewhat limited compared to more ductile alloys. For example, alloys such as 2024 and especially 6061 generally provide better formability and bending characteristics. Regarding weldability, like most 7xxx series alloys, it has limited weldability and mechanical fastening methods are often preferred in structural applications.

Under vibration and dynamic loading conditions, 7178 T73511 aluminum alloy demonstrates excellent performance. Its combination of high strength and elastic modulus provides good fatigue resistance. This makes it particularly suitable for aircraft structures, rocket systems, and high-performance mechanical components. Additionally, it has good coatability and responds well to anodizing and protective surface treatments. Therefore, it is widely used in aerospace, defense, space technologies, and high-performance automotive applications.

Material Standards

7178 T73511 alloy is available in the following standards:
• 7178 T73511 Extruded Round Bar; ASTM B221, AMS QQ-A-200/13, ISO AlZn7MgCu, UNS A97178
• 7178 T73511 Extruded Wire; ASTM B221, AMS QQ-A-200/13, ISO AlZn7MgCu, UNS A97178
• 7178 T73511 Extruded Tube; ASTM B221, AMS QQ-A-200/13, ISO AlZn7MgCu, UNS A97178
 

Key Properties of 7178 T73511:

• Strength: Very Good
• Machinability: Low
• Weldability: Moderate
• Formability: Fair
• Corrosion Resistance: Good
• Heat Treatment: Yes
   

Some Well-Known Applications for 7178 T73511:
In aircraft landing gear structures,
In aircraft fuselage structures,
Mainly used in the aerospace industry, as well as some applications in construction and automotive sectors.
 

Stock Forms
7178 T73511 is supplied in rod/bar and tube/profile forms.

• Rod/Bar
• Tube/Profile