2024-T3 vs 7075-T6
Both are high-strength aerospace aluminum alloys, but they're optimized for opposite priorities: 2024-T3 trades peak strength for fatigue and damage tolerance, while 7075-T6 chases the highest static strength aluminum can offer.
The verdict
Choose 2024-T3 when the part sees cyclic/fatigue loading and crack growth matters most — aircraft skins, fuselage panels, tension structures. Choose 7075-T6 when you need maximum static strength and stiffness-per-weight in compression or bending — highly-stressed fittings, wing spars, tooling. Neither welds well or resists corrosion bare; both should be clad or anodized. 7075 is stronger but more notch-sensitive; 2024 lasts longer under repeated loads.
Side-by-side data
| Property | 2024-T3 | 7075-T6 |
|---|---|---|
| Category | Aluminum | Aluminum |
| Density (g/cm³) | 2.78 | 2.81 |
| Tensile strength (MPa) | 483 | 572 |
| Yield strength (MPa) | 345 | 503 |
| Elongation (%) | 18 | 11 |
| Hardness | 120 HB | 150 HB |
| Max service temp (°C) | 150 | 130 |
| Machinability | ●●●●● | ●●●●● |
| Corrosion resistance | ●●●●● | ●●●●● |
| Relative cost | ●●●●● | ●●●●● |
| Thermal cond. (W/m·K) | 121 | 130 |
| Typically used for | Fatigue-resistant aerospace structures | High-strength aerospace & high-stress parts |
Which should you choose?
Choose 2024-T3 if…
- The part is fatigue-driven — repeated tension or pressurization cycles, where slower crack growth and higher fatigue life beat raw strength
- You need damage tolerance and fracture toughness, e.g. fuselage skins, wing lower surfaces, tension members that must survive flaws
- You want better formability for bending and stretch-forming sheet before final heat-treat condition is reached
- Slightly better elevated-temperature retention matters; 2024 holds up modestly better when warm
- You can use Alclad sheet to offset its poor bare corrosion resistance
Choose 7075-T6 if…
- You need the highest static yield and ultimate strength available in a common aluminum, for compression, bending or highly-loaded fittings
- The design is strength- or stiffness-critical and weight-limited — wing spars, structural brackets, high-stress machined parts
- The part is machined from plate/bar rather than formed from sheet; 7075 machines cleanly to tight tolerances
- Mold, jig and tooling plate where hardness and dimensional stability win (often as 7075-T651)
- Loading is steady or low-cycle, so its greater notch sensitivity and poorer fatigue behavior aren't the limiting factor
Key differences that matter
- Strength vs. durability is the real split: 7075-T6 has the higher static strength, but 2024-T3 has markedly better fatigue life and damage tolerance, which is why airframe skins lean toward 2024.
- 7075 is more notch-sensitive and prone to faster crack growth and stress-corrosion cracking in peak-aged tempers; 2024 is more forgiving of flaws and stress concentrations.
- Both are heat-treatable Cu/Zn alloys and are effectively non-weldable by fusion methods — joining is by rivets, fasteners or bonding, not welding.
- Neither resists corrosion well bare; both are routinely Alclad or anodized, and 7075 especially benefits from protective tempers (T73/T76) where SCC is a concern.
- 7075-T6 typically costs more and machines very well from plate; 2024-T3 is favored as formable sheet and is generally the more economical of the two.
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Open the Material SelectorGet a Quote →Frequently asked questions
Is 2024-T3 stronger than 7075-T6?
No. 7075-T6 has higher yield and ultimate tensile strength — it's one of the strongest common aluminum alloys. 2024-T3 wins on fatigue life and damage tolerance, not peak static strength, so 'stronger' depends on whether the load is steady or cyclic.
Which one should I use for aircraft skins?
Typically 2024-T3 (often Alclad). Skins and pressurized fuselage panels are fatigue- and crack-growth-driven, and 2024's superior damage tolerance makes it the traditional choice. 7075 is used more for highly-loaded spars, fittings and machined structure.
Can I weld 2024 or 7075?
Neither is recommended for fusion welding. Both are precipitation-hardened Cu/Zn alloys that crack and lose temper in the weld zone. Standard practice is mechanical fastening (rivets, bolts) or adhesive bonding; friction stir welding is possible in special cases but not routine.
Which is cheaper, and which machines better?
2024 is generally the more economical and is the go-to formable sheet. 7075 usually costs more but machines exceptionally well from plate and bar, giving clean finishes and tight tolerances — a big reason it's common for tooling and machined fittings.
Can both be anodized, and how do they handle corrosion?
Yes, both anodize, and both have relatively poor bare corrosion resistance. They're commonly used as Alclad sheet or anodized. 7075 is also prone to stress-corrosion cracking in the T6 temper; over-aged tempers like T73/T76 trade some strength for much better SCC resistance.
Property values are typical/nominal figures for early-stage guidance only and vary by temper, grade, supplier and heat treatment. Confirm critical specifications against a certified datasheet or with an mfgiq engineer before production.