Ultra High Strength AL · Aluminum (Additive)
Aluminum 7A77
Aluminum 7A77 is an ultra high strength aluminum — aerospace 7000-series lpbf. Typical values: 540 MPa yield, 2.78 g/cm³, rated to 175 °C. Available for 3D printing at FabDigit.
Properties
Typical room-temperature values in the As Printed condition. Metric first, imperial in gray. The bars show where 7A77 sits against the other 163 aluminum grades in the catalog.
Datasheet
| Yield strength | 540 MPa78 ksi |
|---|---|
| Tensile strength | 620 MPa90 ksi |
| Hardness | 180 HB |
| Density | 2.78 g/cm³0.1 lb/in³ |
| Specific strength (yield ÷ density) | 194 |
| Min service temp | -200 °C-328 °F |
| Max service temp | 175 °C347 °F |
| Electrical conductivity | 30 % IACS17.4 MS/m |
| Machinability | Very good75 / 100 |
| Weldability | Very good75 / 100 |
| Formability | Not recommended5 / 100 |
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Against other aluminum grades
Strength versus weight in the aluminum family
Yield strength against density for every aluminum grade FabDigit runs. 7A77 is highlighted; hover a dot for its name, or open the interactive family chart.
Manufacturability
The process limits FabDigit's quote engine applies to 7A77. Design inside these and the part quotes instantly; outside them it routes to an engineer.
3D printing
| Technologies | DMLS |
|---|---|
| Layer height | 20 – 60 µmdefault 30 µm |
| Minimum wall / feature | 0.5 / 0.3 mm |
| Build envelope | 250 × 250 × 325 mm |
| Supports | Yes |
| Anisotropy | Mild |
| Mandatory post-processing | heat treatment |
Conditions and tempers
How 7A77 is supplied and what each state is for. The default is what FabDigit quotes unless your drawing says otherwise.
| Condition | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
As PrintedDefault Print State | Standard printed state — fine for prototypes and fixtures | — | — | — | — |
Stress Relieved Heat Treat State | Holds tight flatness/tolerance through heavy machining | — | — | — | — |
T6 Solution heat treated, artificially aged (T6) | Heavy load-bearing frames, high-stress parts, precision components | — | — | — | — |
Heat treatment and post-processing
Operations FabDigit's suppliers routinely run on 7A77, ranked by how often they make sense for this grade.
Heat treatment
| Age T6 (Aluminum) | Solution + artificial age to peak strength |
|---|---|
| Age T651 (Aluminum) | T6 + stress relief stretch (plate) |
| Full Anneal | Restore ductility; relieve residual stress; coarsen grain |
| Stress Relief | Reduce residual stress without changing structure |
| Age T73 (Aluminum) | Over-age 7000 for SCC resistance |
Post-processing
| Manual Deburr | Deburrstandard |
|---|---|
| Edge Break (0.5mm) | Deburr |
| Glass Bead Blast | Blast |
| Laser Mark | Marking |
| Sand Blast | Blast |
| Vibratory Tumble | Tumble |
| CMM Inspection | Inspection |
| Masking | Masking |
| Tap After Finish | Finish Fix |
| FAI Report | Inspection |
Surface finishes for 7A77
Coatings and treatments compatible with aluminum on the processes 7A77 runs on. Pick them in the quote configurator or call them out on the drawing.
Plating
- Electroless Nickel (EN)
- Gold Plating
- Silver Plating
Organic Coating
- Epoxy Coating
Metal Finish
- Anodized (Aluminum AM)
- Plated (Metal AM)
Equivalent designations
Standards and trade names that resolve to Aluminum 7A77 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Other
- 7A77.60L7075-strength AluminumHRL 7A77
Stock forms
Raw-material forms FabDigit sources 7A77 in.
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.