EN AW-7178 · AlZn7MgCu
Developed to out-muscle 7075 in compression-critical structure: about 5% stronger in T6, historically flown in upper wing skins. T76 restores exfoliation-corrosion resistance for service environments.
Material Data
Composition and physical properties
| Element | Limit / range |
|---|---|
| Si | ≤ 0.40 |
| Fe | ≤ 0.50 |
| Cu | 1.6 – 2.4 |
| Mn | ≤ 0.30 |
| Mg | 2.4 – 3.1 |
| Zn | 6.3 – 7.3 |
| Cr | 0.18 – 0.28 |
| Al | balance |
Limits per EN 573-3 / applicable registration. The governing specification on your order prevails.
| Property | Value |
|---|---|
| Density | 2.83 g/cm³ |
| Melting range | 477 – 629 °C |
| Thermal expansion (20–100 °C) | 23.4 µm/m·K |
| Elastic modulus | 71.7 GPa |
| Thermal conductivity | 125 W/m·K |
| Electrical conductivity | 31 % IACS |
Strength Data
Mechanical properties by temper
Typical room-temperature values for orientation. Design minimums depend on product form, thickness and the governing specification — request the applicable table with your inquiry.
| Temper | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| O | 105 | 230 | 15 | 60 |
| T6 / T651 / T6511 | 540 | 605 | 8 | 160 |
| T76 / T7651 / T76510 | 505 | 570 | 9 | 150 |
| T73511 | 440 | 510 | 10 | 135 |
Designations & Standards
How this alloy appears on drawings
| System | Designation |
|---|---|
| ISO / EN designation | AlZn7MgCu |
| EN numeric | EN AW-7178 |
| UNS | A97178 |
| Werkstoff-Nr. | — |
| Common product standards | AMS QQ-A-250/14, AMS QQ-A-200/13, AMS QQ-A-200/14 · ASTM B209, B211, B221 · UNS A97178 |
Supply Program
Available from Lipol as
| Product form | Standard | Alloy | Temper | Category |
|---|---|---|---|---|
| Sheet | ASTM B209 | 7178 | O | Aerospace & Defense |
| Sheet | AMS QQ-A-250/14 | 7178 | T6 | Aerospace & Defense |
| Bar / Flat | ASTM B221 | 7178 | T6511 | Aerospace & Defense |
| Bar / Flat | AMS QQ-A-200/14 | 7178 | T76 | Aerospace & Defense |
| Tube / Profile / Extrusion | ASTM B211 | 7178 | T76510 | Aerospace & Defense |
| Plate | UNS A97178 | 7178 | T651 | Machinery, Automotive & Mold |
| Plate | AMS QQ-A-200/13 | 7178 | T73511 | Machinery, Automotive & Mold |
| Plate | EN AW | 7178 | T7651 | General Industry |
Additional tempers, forms and specifications available on request — the table shows the standard program.
Applications
Where EN AW-7178 is the right answer
- Compression-loaded aircraft structure
- Upper wing skins (legacy fleets)
- High-strength machined parts
Specifying EN AW-7178?
State the temper, product form, dimensions and governing standard from the tables above, and we will confirm availability with a firm price and delivery date — typically within one business day.
Request a QuoteMaterial Engineering
Not sure EN AW-7178 is the right alloy?
Describe the application — load, environment, joining, finishing — and our engineers will confirm the choice or propose a better-value alternative.