Table 3.
Actual and proposed uses of 3rd generation Al-Li alloys to replace Traditional Al alloys aircrafts (adopted from Wanhill et al. [5]).
| Product | Al-Li Alloy | Required engineering property | Substitute for | Applications |
|---|---|---|---|---|
| Sheet | 2098-T851, 2198-T8, 2199-T8E74, 2060-T8E30 | Damage tolerant/medium strength | 2024-T3, 2524-T3, 2524-T351 | Fuselage/pressure cabin skins |
| Plate | 2199-T86, 2050-T84, 2060-T8E86 | Damage tolerant | 2024-T351, 2324-T39, 2624-T351, 2624-T39 | Lower wing covers |
| 2098-T82P (sheet/plate) | Medium strength | 2024-T62 | F-16 fuselage panels | |
| 2297-T87, 2397-T87 | Medium strength | 2124-T851 | F-16 fuselage bulkheads | |
| 2099-T86 | Medium strength | 7050-T7451, 7X75-T7XXX | Internal fuselage structures | |
| 2050-T84, 2055-T8X, 2195-T82 | High strength | 7150-T7751, 7055- T7751, 7055-T7951, 7255-T7951 | Upper wing covers | |
| 2050-T84 | Medium strength | 7050-T7451 | Spars, ribs, other internal structures | |
| 2195-T82/T84 | High strength | 2219-T87 | Launch vehicle cryogenic tanks | |
| Forgings | 2050-T852, 2060-T8E50 | High strength | 7175-T7351, 7050-T7452 | Wing/fuselage attachments, window and crown frames |
| Extrusions | 2099-T81, 2076-T8511 | Damage tolerant | 2024-T3511, 2026-T3511, 2024-T4312, 6110-T6511 | Lower wing stringers Fuselage/pressure cabin stringers |
| 2099-T83, 2099-T81, 2196-T8511, 2055-T8E83, 2065-T8511 | Medium/high strength | 7075-T73511, 7075-T79511, 7150-T6511, 7175-T79511, 7055-T77511, 7055-T79511 | Fuselage/pressure cabin stringers and frames, upper wing stringers, Airbus A380 floor beams and seat rails | |