Exploring 7075 Aluminium: The Perfect Balance of Power & Precision
In industries where performance under pressure is non-negotiable, 7075 Aluminium stands out as one of the most sought-after materials. Originally developed for aerospace applications, this alloy is renowned for its exceptional strength-to-weight ratio, corrosion resistance, and high fatigue strength.
Whether it is enhancing the durability of automotive components, or enabling precision in high-stress industrial settings, 7075 Aluminium is a true engineering marvel. In this blog, we’ll explore the unique properties, applications, and benefits of this alloy, shedding light on why it’s the preferred choice for projects that demand both resilience and reliability.
Material Specification
Aluminium 7075 belongs to the 7000 series of aluminium alloys, known for their zinc content, which provides extraordinary strength. The alloy is heat-treatable, enabling manufacturers to optimize its properties based on the needs of specific applications. Magnesium and copper further enhance the alloy’s ability to withstand fatigue and resist stress, making it invaluable when reliability under load is essential.
Physical Properties
Understanding Aluminium 7075’s physical characteristics is important before choosing it for a project. These properties influence how the alloy behaves under different conditions, such as heat, pressure, and electrical demands.
| Property | Value |
| Density | 2.81 g/cm³ |
| Melting Point | ~477°C (890°F) |
| Thermal Conductivity | 130 W/m·K |
| Electrical Conductivity | 33% IACS |
| Coefficient of Thermal Expansion (CTE) | 23.5 µm/m·K |
| Appearance & Surface Finish | Smooth metallic finish, suitable for anodizing, powder coating, and other treatments. |
| Machinability | Good machinability, though harder than many other aluminium alloys. |
Mechanical Properties
Mechanical properties determine how an alloy behaves when subjected to forces, including tensile strength, yield strength, and impact resistance. Aluminium 7075’s mechanical properties make it particularly suitable for high-performance engineering applications.
| Mechanical Property | Value |
| Tensile Strength | 510 – 540 MPa (74,000 – 78,000 psi) |
| Yield Strength | 430 – 480 MPa (62,000 – 69,000 psi) |
| Elongation | 5% – 11% |
| Hardness (Brinell) | 150 HB (T6 temper) |
| Fatigue Strength | 160 MPa (23,000 psi) |
| Modulus of Elasticity | 71.7 GPa (10,400 ksi) |
| Impact Resistance | High, due to excellent toughness |
Chemical Structure
The chemical composition of Aluminium 7075 plays a key role in its superior mechanical and physical properties. Its high zinc content is complemented by magnesium, copper, and chromium, which together enhance its strength and resistance to environmental degradation.
| Elements | Quantity |
| Aluminium (Al) | 87.1% – 91.4% |
| Zinc (Zn) | 5.1% – 6.1% |
| Magnesium (Mg) | 2.1% – 2.9% |
| Copper (Cu) | 1.2% – 2.0% |
| Chromium (Cr) | 0.18% – 0.28% |
| Others (Fe, Si, Mn) | <0.5% |
Primary Types
Aluminium 7075 can be processed into various forms, each tailored to meet the demands of different industries. The most common forms include sheets, plates, bars, and tubes, which are used across multiple sectors due to their versatility and performance.
- Sheets: Aluminium 7075 sheets are thin, flat pieces of metal often used in industries like aerospace and automotive. These sheets are typically employed in structures requiring both high strength and low weight, such as aircraft fuselages or vehicle panels.
- Plates: Thicker than sheets, 7075 plates offer enhanced strength and rigidity. These plates are used in tooling, structural components, and other applications where extra durability is required, such as in the production of heavy-duty machines.
- Bars: 7075 bars are available in a variety of diameters and lengths, providing solid, reliable strength for applications like defense or high-stress machinery.
- Tubes: 7075 aluminium tubes, with their hollow structures, are used in aerospace, engineering, and sporting goods, where a balance of strength, flexibility, and low weight is crucial.
Key Dimensions
Aluminium 7075 sheets and plates are available in a wide range of dimensions to meet the needs of different industries. Thickness can range from 0.2mm to 200mm, with widths up to 1500mm. Custom dimensions are also available to match specific project requirements.
Equivalent Grades
Aluminium alloys are produced according to international standards, and Aluminium 7075 has several equivalent grades that are compatible with global manufacturing norms. Here’s a brief overview of some commonly equivalent aluminium grades and why they’re comparable to 7075:
- AA2024: Often compared to 7075 due to its strength, AA2024 is also a high-strength, heat-treatable alloy with excellent fatigue resistance. However, AA2024 contains more copper, giving it slightly better machinability but less corrosion resistance compared to 7075.
- AA6061: While not as strong as 7075, AA6061 is known for its versatility and weldability. It’s used in applications where strength is important, but corrosion resistance and ease of workability are more critical. AA6061 is frequently used in marine and construction applications.
- EN AW-7075: This is the European equivalent of 7075, ensuring compatibility with international standards. It shares the same chemical composition and mechanical properties, allowing it to be used interchangeably in global projects.
- A97075: Another common equivalent, A97075 adheres to ASTM standards and is often used in North American manufacturing. Like other equivalents, it offers the same excellent mechanical and physical properties that define the 7075 alloy.
These grades are considered equivalents based on their similar composition, mechanical performance, and suitability for high-stress applications. They allow manufacturers to meet regional standards without compromising on the quality or strength of the material.
Aluminium 7075 Sheet Weight
Understanding the weight of aluminium sheets is important for projects where weight is a limiting factor. For example, a 1mm thick sheet of Aluminium 7075 with a surface area of 1m² typically weighs around 2.81kg. A 10mm thick sheet of the same area weighs approximately 28.1kg. This lightweight, combined with exceptional strength, is one of the primary reasons 7075 is favoured in industries like aerospace.
Aluminium 7075 Sheet Sizes
Aluminium 7075 sheets are available in standard and custom sizes to suit various applications. Standard sizes range from 1m x 2m to 1.5m x 3m, with thickness options from 0.2mm to 200mm. Custom dimensions can be manufactured as required, making it easy to tailor the material for specific project needs.
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