Aluminum 7068 T76511
Temper
AA 7068 · UNS A97068
T76511 = solution treated, stretched, overaged for exfoliation/SCC resistance
Pick when exfoliation and stress-corrosion resistance are required and ~7 % strength loss versus T6511 is acceptable.
Values for the T76511 condition
Other 7068 tempers and conditions
7068 is listed in 7 conditions; see the grade overview at 7068.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Soft fabrication condition for heavy forming or straightening before re-heat-treatment; never used as a service temper. | 110 | 230 | 14 | 60 HB | 42 % IACS |
Solution treated, stretched, fully overaged for maximum SCC resistance | Special-order overaged condition for the most SCC-critical parts; strength drops toward 7075-T73 levels so it is rarely specified for 7068. | 555 | 600 | 12 | 160 HB | 39 % IACS |
T76511This page Solution treated, stretched, overaged for exfoliation/SCC resistance | Pick when exfoliation and stress-corrosion resistance are required and ~7 % strength loss versus T6511 is acceptable. | 620 | 655 | 11 | 175 HB | 36 % IACS |
T6, stress relieved by stretching | Use for flat rolled or machined plate/bar where low residual stress and dimensional stability during machining matter. | 670 | 700 | 10 | 185 HB | 31 % IACS |
Solution heat treated and artificially aged | Peak-strength temper for forgings and non-stress-relieved product where maximum static strength is wanted. | 676 | 705 | 10 | 188 HB | 31 % IACS |
T6511Default T6, stress relieved by stretching, minor straightening | The standard stocked condition for 7068 extruded rod/bar/shapes — maximum strength with controlled residual stress. | 683 | 710 | 11 | 190 HB | 31 % IACS |
Solution treated, stress-relieved by stretching, aged; no further… | Extruded shapes/bar with minimum residual stress and no post-stretch straightening — best choice for symmetric heavy machining. | 683 | 710 | 11 | 190 HB | 31 % IACS |
What is 7068 T76511?
7068 T76511 is 7068 in the T76511 temper — pick when exfoliation and stress-corrosion resistance are required and ~7 % strength loss versus T6511 is acceptable. 7068 T76511 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 99% of aluminum grades. Elongation at break is 11% and the elastic modulus is 73 GPa (10.6 Msi). 7068 T76511 has a density of 2.85 g/cm³ (0.103 lb/in³), heavier than 96% of aluminum grades. It melts at 476°C (889 °F). T6511 is the default condition FabDigit quotes; T76511 is available on request or by drawing note.
Advantages
- High strength — 620 MPa (89.9 ksi), better than 99% of aluminum grades
- Polishes to a fine finish — 65/100, better than 82% of aluminum grades
- Conducts heat well — 165 W/m·K (95.3 BTU/hr·ft·°F), better than 79% of aluminum grades
Limitations
- Difficult to weld — 12/100, worse than 98% of aluminum grades
7068 T76511 properties
Typical room-temperature values for 7068 T76511; 10 are specific to this condition. Other listed values are 7068 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7068 T76511 has a density of 2.85 g/cm³ (0.103 lb/in³), heavier than 96% of aluminum grades. It melts at 476°C (889 °F).
Mechanical13
7068 T76511 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 99% of aluminum grades. Elongation at break is 11% and the elastic modulus is 73 GPa (10.6 Msi).
Thermal6
7068 T76511 is rated for continuous service to 150°C (302 °F). It conducts heat at 165 W/m·K (95.3 BTU/hr·ft·°F), better than 79% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
7068 T76511 conducts electricity at 36 % IACS, better than 55% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 62% of aluminum grades.
Sustainability4
Producing a kilogram of 7068 T76511 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 5%.
Manufacturability7
7068 T76511's machinability is very good (70/100, better than 72% of aluminum grades); weldability not recommended (12/100); formability not recommended (12/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 7068 T76511
Is 7068 easy to machine?
Machines well with sharp carbide, high speed and polished flutes (like 7075 but with higher cutting forces and springback); use flood or MQL coolant and choose T6510/T651 for low residual stress on thin-walled parts.
Can 7068 be welded?
Not recommended for fusion welding (hot cracking and severe HAZ strength/SCC loss); join by fasteners, adhesives, or friction-stir/friction welding with post-weld aging where qualified.
Can 7068 be formed, bent or molded?
Essentially no cold forming in T6x — bend or form in O/W (as-quenched) condition and re-age; supplied mainly as extrusions and die forgings hot-worked at ~370–430 °C.
What surface finishes work on 7068?
Anodizes well including Type III hard coat (shade runs slightly grey/dark); protect short-transverse machined surfaces with anodize + primer to limit stress-corrosion and exfoliation risk, or specify a T76 temper.
7068 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Znprimary strengthening addition | 7.3 – 8.3 | 7.8 |
| Mg | 2.2 – 3 | 2.6 |
| Cu | 1.6 – 2.4 | 2 |
| Zrgrain-structure control (recrystallization inhibitor) | 0.05 – 0.15 | 0.1 |
| Si | ≤ 0.12 | — |
| Fe | ≤ 0.15 | — |
| Mn | ≤ 0.1 | — |
| Cr | ≤ 0.05 | — |
| Ti | ≤ 0.01 | — |
| Others (each)0.15 max total | ≤ 0.05 | — |
| Al | balance | — |
7068 T76511 — frequently asked
What is 7068 T76511 used for?
7068 T76511 is typically used for bicycle components, sporting goods (golf clubs, bats), high-strength fasteners and military components. In short: highest-strength aluminum extrusion; stronger than 7075-T6; not fusion weldable.
What is the yield strength of 7068 T76511?
7068 T76511 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 99% of aluminum grades. Strength varies by condition: see the 7 listed tempers.
Is 7068 T76511 easy to machine?
Yes — machinability is rated very good (70/100, better than 72% of aluminum grades). Machines well with sharp carbide, high speed and polished flutes (like 7075 but with higher cutting forces and springback); use flood or MQL coolant and choose T6510/T651 for low residual stress on thin-walled parts.
Can 7068 T76511 be welded?
Not readily — weldability is rated not recommended (12/100). Not recommended for fusion welding (hot cracking and severe HAZ strength/SCC loss); join by fasteners, adhesives, or friction-stir/friction welding with post-weld aging where qualified.
What surface finishes work on 7068 T76511?
Anodizes well including Type III hard coat (shade runs slightly grey/dark); protect short-transverse machined surfaces with anodize + primer to limit stress-corrosion and exfoliation risk, or specify a T76 temper.
Can 7068 T76511 be formed, bent or molded?
Essentially no cold forming in T6x — bend or form in O/W (as-quenched) condition and re-age; supplied mainly as extrusions and die forgings hot-worked at ~370–430 °C.
What is the maximum service temperature of 7068 T76511?
7068 T76511 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 7068-T6511 and 7068-O?
T6511 is the default condition — the standard stocked condition for 7068 extruded rod/bar/shapes — maximum strength with controlled residual stress. O: soft fabrication condition for heavy forming or straightening before re-heat-treatment; never used as a service temper. Yield strength is 683 MPa in T6511 versus 110 MPa in O.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- 7068 Extruded Rod, Bar and Shapes — Alloy Data — Kaiser Aluminum (2020)
- ASM Handbook Vol.2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- MMPDS (Metallic Materials Properties Development and Standardization) — Battelle/FAA (2023)
- MatWeb aluminium 7068-T6511 data record — MatWeb LLC (2024)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.