EN AW-2024 vs EN AW-7075: Both aerospace alloys — different strength/fatigue profiles
EN AW-2024 vs EN AW-7075
Side-by-side chemical composition and mechanical property comparison.
Overview
EN AW-2024
3.1355
Classic high-strength aerospace aluminium alloy (Al-Cu-Mg). Excellent fatigue resistance — the standard choice for aircraft fuselage skins and wing tension members. Poor corrosion resistance and weldability. Often supplied with Alclad cladding for corrosion protection. In use since 1931.
EN AW-7075
3.4365
The classic high-strength aerospace aluminium alloy. Al-Zn-Mg-Cu composition provides the highest strength of all common aluminium alloys in T6 temper. Poor weldability and limited corrosion resistance. Used for aircraft structures, M16 rifle receivers, rock climbing gear, and precision mold plates.
| EN AW-2024 | EN AW-7075 | |
|---|---|---|
| Material Number | 3.1355 | 3.4365 |
| Category | Aluminum | Aluminum |
| Standard | EN 573-3 | EN 573-3 |
Chemical composition (wt%)
| Element | EN AW-2024 | EN AW-7075 | Overlap |
|---|---|---|---|
| Si | 0–0.5% | 0–0.4% | OK |
| Mn | 0.3–0.9% | 0–0.3% | Partial |
| Cr | 0–0.1% | 0.18–0.28% | No overlap |
| Cu | 3.8–4.9% | 1.2–2% | No overlap |
Mechanical properties
| Property | EN AW-2024 | EN AW-7075 | Unit |
|---|---|---|---|
| tensile_strength | 400–430 | ≥ 540 | MPa |
| yield_strength | 270–280 | ≥ 470 | MPa |
| elongation | ≥ 10 | ≥ 7 | % |
Compatibility Assessment
7075-T6 is stronger (540 vs 400 MPa UTS) but 2024-T3 has better fatigue resistance. 2024 is chosen for fuselage skins under cyclic loading; 7075 for structural members under static high stress. Both have poor weldability.
Frequently Asked Questions
Is EN AW-2024 the same as EN AW-7075?
EN AW-2024 and EN AW-7075 have a 35% composition overlap. Both aerospace alloys — different strength/fatigue profiles
Can I replace EN AW-2024 with EN AW-7075?
Generally not recommended. The compositions differ significantly (35% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between EN AW-2024 and EN AW-7075?
The main differences are in the following elements: Mn, Cr, Cu, Mg. EN AW-2024 is a Aluminum grade, while EN AW-7075 is a Aluminum grade.
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