7050-T7451 Aluminium

UNS A97050 aluminium
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High-strength Zn-Mg-Cu aluminium alloy with superior resistance to stress-corrosion cracking versus 7075, due to Zr addition. Preferred thick-plate alloy for airframe bulkheads and wing spars.

Applicable Standards

  • AMS 4050
  • ASTM B209
  • AMS-QQ-A-250/12

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Al 87.0 91.0 ~89.0
Zn 5.7 6.7 ~6.2
Cu 2.0 2.6 ~2.3
Mg 1.9 2.6 ~2.25
Zr 0.08 0.15 ~0.11
Fe — 0.15 ~0.07
Al 87.0–91.0% Zn 5.7–6.7% Cu 2.0–2.6% Mg 1.9–2.6% Zr 0.08–0.15% Fe 0.0–0.15%

Typical Applications

  • Aircraft fuselage frames and bulkheads
  • Wing spars and ribs
  • Thick-plate structural components
  • Helicopter components
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