Aluminum 7475

General Characteristics of Aluminum 7475

Aluminum 7475 offers strength and fracture toughness while resisting fatigue crack propagation. It’s an ideal aircraft alloy appropriate for fuselage skins and bulkheads, and wing parts for commercial, fighter and transport airplanes.

Chemical Composition of Aluminum 7475

• Silicon 0.10 max
• Iron 0.12 max
• Copper 1.2-1.9
• Manganese 0.06 max
• Magnesium 1.9-2.6
• Chromium 0.18-0.25
• Zinc 5.2-6.2
• Titanium 0.06 max
• Additional impurities 0.5 individual max; 0.15 total max
• Aluminum balance

Heat Treatment of Aluminum 7475

Refer to Alcoa®’s recommended practices for:

• Strength, fracture toughness optimization
• Solution treating
• Aging

Applications of Aluminum 7475

• Fuselage parts
  • Skins
  • Bulkheads
• Wing components
  • Upper and lower skins
  • Spars
  • Center structures

Corrosion Resistance of Aluminum 7475

• Acceptable exfoliation resistance in -T61 and -T651 tempers
• Comparable or better than other high-strength alloys, including 7075, 7050, and 2024

Workability of Aluminum 7475

• Improved forming vs. 7075
• 7475 sheet offers superplastic forming qualities in some instances
• Heat treat to standard -T62 or -T762 temper for required corrosion resistance and toughness

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