Metals & alloys · Aluminium alloys
7075 aluminium alloy
A high-strength Al–Zn–Mg–Cu alloy used for aerospace and high-performance structures where specific strength is prioritized over weldability and general corrosion tolerance.
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01
Overview
- Material class
- Metals & alloys
- Category
- Aluminium alloys
- Family
- Aluminium Alloy
- Product forms
- Sheet/plate, Bar/rod
Composition
| Constituent | Min | Max | Typical | Note |
|---|---|---|---|---|
| Zn | 5.1 | 6.1 | 5.6 | |
| Mg | 2.1 | 2.9 | 2.5 | |
| Cu | 1.2 | 2 | 1.6 | |
| Cr | 0.18 | 0.28 | 0.23 | |
| Fe | 0.5 | 0.2 | ||
| Si | 0.4 | 0.1 | ||
| Mn | 0.3 | 0.05 | ||
| Al | Balance |
02
Properties and conditions
Engineering properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Density | 2.81 | g/cm³ | Representative; verify product form and condition |
| Elastic modulus | 71.7 | GPa | Representative; verify product form and condition |
| Thermal conductivity | 130–160 | W/m·K | temper dependent |
| Yield strength | ~430–505 | MPa | T6/T651 representative |
| Tensile strength | ~505–570 | MPa | T6/T651 representative |
| Elongation | 5–13 | % | product dependent |
Conditions
O annealed
Annealed condition.
T6 / T651
Peak-strength ageing family.
T73 / T7351
Overaged family prioritising stress-corrosion resistance.
T76 / T7651
Intermediate overage family.
03
Processing and use
Processing
- Solution treatment, quench control and aging route determine strength and SCC resistance.
- T73/T74-type overaging trades some strength for better corrosion resistance.
Applications
- Aircraft structures
- High-strength fittings
- Sporting equipment
- Precision machined components
Selection considerations
- Fusion welding is generally avoided for primary high-strength applications.
- Short-transverse properties and exfoliation/SCC resistance require product-specific control.
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04
Standards and related materials
Standards and designations
| System | Designation | Note |
|---|---|---|
| AA | 7075 | |
| UNS | A97075 | |
| EN | EN AW-7075 | |
| ASTM | B209/B221 | depending product form |
Other names
- Al 7075
05
Sources and context
Sources
- Aluminum Association 7075 designationExisting reference
- IMMES Simulation Lab nominal chemistryExisting reference
- NASA materials selection resourcesApplication reference
Confirm the applicable specification, product form and condition before using values for design or procurement.
Supply and sustainability
Widely available in aerospace-quality plate, bar, extrusion and forgings, with tighter supply qualification than 6xxx alloys.
High scrap value and recyclability; segregation is important to preserve 7xxx chemistry in closed loops.
Strategic context
Established engineering material with documented processing–performance relationships.