EN AW-7050 vs EN AW-7075: Both high-strength 7xxx aerospace alloys — 7050 better in thick sections
EN AW-7050 vs EN AW-7075
Side-by-side chemical composition and mechanical property comparison.
Overview
EN AW-7050
3.4144
High-strength aerospace aluminium developed by Alcoa for thick-plate applications. Zr addition (instead of Cr) reduces quench sensitivity for superior properties in thick sections. T7451 temper gives excellent SCC resistance + fracture toughness. Used for fuselage frames, bulkheads, wing spars, and thick structural aerospace components.
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-7050 | EN AW-7075 | |
|---|---|---|
| Material Number | 3.4144 | 3.4365 |
| Category | Aluminum | Aluminum |
| Standard | AMS 4050 | EN 573-3 |
Chemical composition (wt%)
| Element | EN AW-7050 | EN AW-7075 | Overlap |
|---|---|---|---|
| Si | 0–0.12% | 0–0.4% | OK |
| Mn | 0–0.1% | 0–0.3% | OK |
| Cr | — | 0.18–0.28% | — |
| Cu | 2–2.6% | 1.2–2% | Partial |
Mechanical properties
| Property | EN AW-7050 | EN AW-7075 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 510 | ≥ 540 | MPa |
| yield_strength | ≥ 450 | ≥ 470 | MPa |
| elongation | ≥ 9 | ≥ 7 | % |
Compatibility Assessment
7075-T6 has slightly higher peak strength but 7050-T7451 has far better SCC resistance and fracture toughness in thick plate (>3 inches). 7050 uses Zr (not Cr) for reduced quench sensitivity. Choose 7050 for thick structural; 7075 for thin sheet.
Frequently Asked Questions
Is EN AW-7050 the same as EN AW-7075?
EN AW-7050 and EN AW-7075 have a 70% composition overlap. Both high-strength 7xxx aerospace alloys — 7050 better in thick sections
Can I replace EN AW-7050 with EN AW-7075?
In many cases, yes. The compositions overlap significantly (70%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between EN AW-7050 and EN AW-7075?
The main differences are in the following elements: Cu, Zn, Mg. EN AW-7050 is a Aluminum grade, while EN AW-7075 is a Aluminum grade.
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