EN AW-7050
3.4144High-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.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AA | USA | AA 7050 | A97050 | REF |
| 🇪🇺 | EN | Europe | EN AW-7050 / AlZn6CuMgZr | 3.4144 | 100% |
Sources: AMS 4050, EN 573-3
Chemical composition comparison (wt%)
Side-by-side: EN AW-7050 (AA) (AA / AMS 4050) vs EN AW-7050 / AlZn6CuMgZr (EN)
| Element | EN AW-7050 (AA) | EN AW-7050 / AlZn6CuMgZr (EN) | Overlap |
|---|---|---|---|
| Si | 0–0.12% | — | — |
| Mn | 0–0.1% | — | — |
| Cu | 2–2.6% | — | — |
| Ti | 0–0.06% | — | — |
| Zn | 5.7–6.7% | — | — |
| Mg | 1.9–2.6% | — | — |
| Zr | 0.08–0.15% | — | — |
| Fe | 0–0.15% | — | — |
Mechanical properties
T7451
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 510 | MPa |
| Yield Strength | ≥ 450 | MPa |
| Elongation | ≥ 9 | % |
| Elastic Modulus | ≥ 72 | GPa |
| Density | ≥ 2.83 | g/cm3 |
T7651
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 545 | MPa |
| Yield Strength | ≥ 475 | MPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 475–490 °C | water | 30-120 min | Rapid quench critical. Zr reduces quench sensitivity vs 7075. |
| aging_T7451 | 120–165 °C | air | Multi-step | T7451: Overaged for SCC resistance. Multi-step aging typical. |
Compatibility verdict
EN AW-7050 and EN AW-7050 / AlZn6CuMgZr: 100% composition match
Close equivalents but NOT identical.
Related materials
EN AW-6082
3.2315High-strength structural aluminium alloy in the Al-Mg-Si family. One of the strongest 6xxx series alloys due to manganese addition. Replaced 6061 in many European applications. Used for trusses, bridges, cranes, transport, scaffolding, and marine applications. Heat treatable (T6/T651).
EN AW-5083
3.3547The highest-strength non-heat-treatable aluminium alloy. Excellent corrosion resistance (especially seawater), good weldability. Standard alloy for shipbuilding, offshore, pressure vessels, cryogenic applications, and armour plate. Not for continuous service above 65°C under stress (SCC risk).
EN AW-2024
3.1355Classic 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.
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