What is 7075 aluminum alloy?

What Is 7075 Aluminum?

7075 aluminum is a heat-treatable aluminum alloy known for its high strength as its core advantage. It is an aerospace-grade material whose primary alloying element is zinc, along with magnesium and copper. Belonging to the 7xxx series, it is one of the most representative grades in this category. It features high strength and light weight, and is mainly used in the manufacturing of aircraft structural components, aerospace parts, bicycle frames, golf club heads, and molds

 7075 Aluminum Composition (Typical Chemical Composition (wt.%))

7075 Aluminum Properties (Yield strength/elongation/hardness)

Data compiled from publicly available material datasheets, including ASM aluminum alloy data, ASTM references, and typical industry values. Actual properties may vary depending on product form and processing route.

7075 Aluminum Density/Melting point

• Density: ~2.81 g/cm³

• Elastic Modulus: ~71 GPa

• Thermal Conductivity: ~155 W/m·K

• Electrical Conductivity: ~33% IACS

• Melting Pointing: 475--635℃

These values reflect the balance between high mechanical strength and relatively low density that defines 7075 aluminum.

7075 Aluminum Temper Comparison

1. T6

Process:
Solution heat treatment → quenching → artificial aging (peak aging)

Characteristics:

• Highest strength (close to the alloy's limit)

• High hardness

• Good fatigue resistance

• High susceptibility to stress corrosion cracking (SCC)

• High residual stress, possible deformation

Applications:
Structures requiring extremely high strength in relatively mild corrosion environments

2. T651

Process:
Solution heat treatment → quenching → stress relief by stretching → artificial aging

Characteristics:

• Strength ≈ T6 (slightly lower, but very close)

• Significantly reduced residual stress

• Low machining deformation, good dimensional stability

• Corrosion resistance similar to T6 (moderate)

Applications: One of the most commonly used tempers. Thick plates, precision machined parts, molds

3. T73

Process:
Solution heat treatment → quenching → overaging

Characteristics:

• Strength significantly lower than T6

• Greatly improved resistance to stress corrosion cracking (key advantage)

• Good exfoliation corrosion resistance

• Better toughness

Applications:
Critical aerospace load-bearing components, corrosive environments (humid or marine)

4. T7351

Process:
Solution heat treatment → quenching → stress relief by stretching → overaging

Characteristics:

• Strength slightly lower than T651

• Combines low residual stress and high corrosion resistance

• Good dimensional stability

• Well-balanced overall performance

Applications: Widely used in the aerospace industry. Thick structural plates, wing and fuselage components

5. T76

Process:
Solution heat treatment → quenching → intermediate overaging (between T6 and T73)

Characteristics:

• Strength higher than T73, lower than T6

• Better SCC resistance than T6, but not as good as T73

• A “balanced” temper

Applications:
Structures requiring both relatively high strength and some corrosion resistance

6. T7651

Process:
Solution heat treatment → quenching → stress relief by stretching → T76-type aging

Characteristics:

• Strength: medium-high (between T651 and T7351)

• Corrosion resistance: medium to high

• Low residual stress, good stability

• Better overall performance than T76

Applications:
High-end aerospace structural parts, thick machined components

7075 Aluminum Product Catagory

7075 aluminum sheet plate: 7075 t6 alclad sheet 

7075 aluminum bar: Forged 7075 T6 T652 T7352 aluminum bar

7075 aluminum tube: 7075 T6 T73 T73511 Aluminum Tube

7075 aluminum price is generally on the higher end among aluminum alloys, and depends on several factors, so if you want more accurate price, pls contact sales of Shenzhen Chinalcometal.

What is 7075 aluminum used for?

7075 aluminum alloy is widely used in high-performance applications where require high strength, low weight, and reliability.  In the aerospace field, it is commonly used for aircraft structural components such as wing spars, fuselage frames, bulkheads, and landing gear parts, as well as spacecraft structural assemblies where high load-bearing capability is required. Beyond aerospace, it is also used in high-end bicycle frames, mountain bike components, and sports equipment, where lightweight design and stiffness are necessary. In addition, it is used in high-precision mechanical parts such as molds, tooling fixtures, jigs, and automotive performance components. Its combination of strength, machinability, and durability makes it a preferred material for demanding structural and engineering applications.

7075 Aluminum vs 6061 Aluminum Properties

6061 Aluminum vs 7075 Aluminum Applications

7075 Aluminum Alloy

• Aerospace structural components (wing spars, fuselage frames, bulkheads)

• High-performance bicycle frames and sports equipment

• High-stress mechanical parts (gear components, load-bearing shafts)

• Molds, tooling fixtures, and precision aerospace components

6061 Aluminum Alloy

• General structural and engineering components

• Automotive parts and frames

• Construction materials (profiles, brackets, structural supports)

• Pipes, tubing, and welded assemblies

• General-purpose machined parts and housings

 FAQ About 7075 Aluminum

Can 7075 Aluminum Be Welded?

7075 aluminum is generally not recommended for welding. Its high zinc and copper content increases the risk of hot cracking, and welding significantly reduces mechanical strength in the heat-affected zone. Mechanical fastening or alternative alloys are usually preferred.

Can You Anodize 7075 Aluminum?

Yes, 7075 aluminum can be anodized. However, due to its copper content, the anodized surface may appear darker or less uniform compared to alloys such as 6061. For functional anodizing, this is typically acceptable, while decorative finishes may be more challenging.

Can You Bend 7075 Aluminum?

Bending 7075 aluminum is limited, especially in T6 and T651 tempers, where cracking can occur. Softer conditions such as annealed or T73 may allow limited forming, but tight bend radii are generally not recommended.

How Strong Is 7075 Aluminum?

7075-T6 aluminum offers tensile strength up to approximately 580 MPa, approaching that of some low-carbon steels while weighing roughly one-third as much. This makes it one of the strongest commercially available aluminum alloys.

Is 7075 aluminum better than 6061?

When answering the question “Is 7075 aluminum better than 6061?”, it cannot be simply judged as “better or worse,” because the two alloys are designed for different purposes and performance priorities. A more accurate way to understand them is whether they are suitable for a specific application. 7075 aluminum alloy is primarily optimized for high strength and high stiffness. Its main advantage lies in its excellent mechanical properties and very high strength-to-weight ratio. However, this comes at the expense of relatively poorer machinability, weldability, corrosion resistance, and higher cost. Therefore, it is typically used in applications requiring extreme structural performance, such as aerospace components, high-load mechanical structures, and high-performance sports equipment.

In contrast, 6061 aluminum alloy focuses on a balance of overall properties. It offers a well-rounded combination of strength, machinability, weldability, and corrosion resistance. Although its strength is significantly lower than that of 7075, it is more than sufficient for most general engineering applications, while also being more cost-effective and easier to manufacture. Therefore, in practical material selection, 7075 is preferred when maximum performance and lightweight structural efficiency are the primary goals, whereas 6061 is a more suitable choice when manufacturing ease, cost efficiency, and environmental adaptability are more important.