If you plan to purchase one or more temper grades of 7075 aluminum alloy, it is essential to work with an aluminum supplier that has extensive industry experience and comprehensive processing capabilities. At GNEE, we collaborate closely with a network of high-quality aluminum producers to ensure customers receive reliable, premium-grade materials for their specific applications. Our advanced sawing and processing services use modern technology to consistently deliver aluminum products in the exact shapes and sizes required.
Zinc is the primary alloying element in 7075 aluminum alloy. This alloy offers above-average machinability and excellent fatigue strength. However, it has lower corrosion resistance than many other aluminum alloys and is not suitable for welding. When lower-cost alloys cannot meet performance requirements, this higher-priced alloy is often the preferred solution.
7075 aluminum alloy is available in several temper conditions, including 7075-T6, 7075-T651, 7075-T7351, and 7075-O.
7075 Aluminum Properties
As a strong and durable aluminum alloy, 7075 contains carefully balanced alloying elements that give it outstanding performance. These elements include zinc, silicon, magnesium, chromium, iron, and aluminum. Together, they provide good machinability and an excellent strength-to-weight ratio.
Key Advantages of 7075 Aluminum
7075 aluminum is widely regarded as one of the strongest commonly used aluminum alloys for industrial applications. Its strength is comparable to many steel alloys, while still offering the benefits of lighter weight, good machinability, and acceptable corrosion resistance.
This alloy also has a reflective surface and produces an attractive finish when polished, often eliminating the need for painting. This further reduces overall component weight, a critical advantage in aerospace applications.
7075 aluminum is composed of approximately 90% aluminum, 5.6% zinc, 2.5% magnesium, and 1.6% copper, with a density of about 0.102 lb/in³. Its ability to withstand stresses encountered during high-altitude flight makes it ideal for aircraft structural components.
Tempers such as T7351 and T73 offer enhanced resistance to stress corrosion cracking.
Zinc is the dominant alloying element in 7075 aluminum. Historically, this alloy was the first high-strength Al-Zn-Mg-Cu alloy to include chromium, which significantly improves resistance to stress corrosion cracking, especially in sheet products. Although 7075 aluminum is not weldable and provides only moderate corrosion resistance, its excellent fatigue strength and high strength-to-density ratio make it well suited for demanding applications such as military firearms and climbing equipment.
Applications of 7075 Aluminum
The 7000 series aluminum alloys are used across many industries, with 7075 being especially valued for its combination of light weight and toughness. Aerospace, aviation, and automotive sectors rely on this alloy for its superior fatigue resistance, making it suitable for applications involving constant movement and fluctuating pressures. In such demanding conditions, 7075 aluminum is often the most cost-effective solution.
7075 aluminum is widely used in aircraft structures, including fuselages and wings. It is also applied in recreational and commercial fields such as bicycle manufacturing, rock climbing equipment, archery products, and firearms. Notably, the military has used 7075 aluminum alloy in the production of M16 rifles.
To meet diverse application needs, 7075 aluminum is supplied in multiple forms. Aluminum bar products are particularly common in high-stress applications. Whether used for bicycle components, military-grade firearms, plastic injection molds, gears, fuse components, or bows, 7075 aluminum is frequently the alloy of choice.
Machining and Welding Considerations
7075 aluminum alloy offers excellent machinability, making it suitable for high-speed CNC machining. Heat treatment distributes the alloying elements evenly throughout the aluminum matrix, allowing clean chip formation and preventing tool clogging during machining.
Welding, however, is generally not recommended for 7075 aluminum. The alloying composition and heat treatment that give 7075 its high strength also make it susceptible to micro-cracking and strength loss in the heat-affected zone. Since this alloy is specifically selected for high-strength applications, welding can significantly reduce performance in both the welded area and the surrounding base material. For this reason, design engineers typically prefer mechanical fastening methods such as riveting when joining 7075 components.
In some cases, particularly in the plastic mold industry, limited welding may be performed to repair or modify molds made from 7075 aluminum. This usually involves removing a defect and filling it with weld material. Even in these situations, welding can alter the microstructure of the aluminum, softening the heat-affected zone and potentially affecting surface appearance-especially on textured mold surfaces. Additionally, corrosion resistance may be reduced after arc or gas welding.
At GNEE, we help customers select the appropriate 7075 aluminum temper and processing method to ensure optimal performance, reliability, and service life for their applications.
