 |
||
 |
|
|
 |
 |
|
|||||||
ALLOY CHOICE
PROCESSES
POST FORMING |
|||||||||
7475 is an Al-Zn-Mg-Cu alloy developed for applications requiring the high strength of 7075 and increased fracture toughness. The sheet has strength approximately the same as that of 7075 combined with toughness similar to 2024-T3 at room temperature. Its high strength to weight ratio allows its extensive use within the aerospace industry for structural components. Resistance to stress-corrosion cracking and exfoliation are similar to that of 7075. The T76 type temper provides for improved exfoliation resistance and stress corrosion resistance over T6 type temper, with some decrease in strength. Stress corrosion cracking in 7475 T76 is not anticipated if the total sustained tensile stress is less than 25% of the minimum specified yield strength. The T76 temper whilst providing the above resistance to stress condition cracking, also provides resistance or immunity to exfoliation corrosion.
Above: Baggage door inner skin from the Learjet 45 formed in 7475 alloy |
|||||||||
|
|
|
|
|
|
|
|
|
|
