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Strength in numbers

Aluminium Alloy   |   ASTM & FED-QQ

QQ-A-200/11 T73 Bar

Commercial7075

A very high strength aerospace aluminium alloy with, depending upon temper, Yield Strength of 24-68 ksi (165 - 465 MPa) and Tensile Strength of 40-78 ksi (275 - 540 MPa).
This alloy is used where high strength is required and where good resistance to general corrosion is NOT important.


Chemical Composition

SAE AMS QQ-A-200/11
Alloy QQ A 200/11
Chemical Element % Present
Aluminium (Al) balance
Other (Each) 0.05 max
Others (Total) 0.15 max
Titanium (Ti) 0.2 max
Chromium (Cr) 0.18 - 0.28
Manganese (Mn) 0.3 max
Silicon (Si) 0.4 max
Iron (Fe) 0.5 max
Copper (Cu) 1.2 - 2
Magnesium (Mg) 2.1 - 2.9
Zinc (Zn) 5.1 - 6.1

Alloy Designations

Aluminium alloy QQ-A-200/11 has similarities to the following standard designations and specifications but may not be a direct equivalent:

AMS 4166, AMS 4168, AMS 4169


Temper Types

Alloy QQ-A-200/11 is supplied in a wide range of tempers:

  • O
  • T6
  • T62
  • T6510
  • T6511
  • T73
  • T7310
  • T7311
  • T8511
  • T7351
  • T73511

Supplied Forms

Alloy QQ-A-200/11 T6511 is supplied in extruded bar

  • Bar
  • Extrusions

Generic Physical Properties

Physical Property Value
Density 2.81 g/cm³
Melting Point 635 °C
Thermal Expansion 23.5 x10^-6 /K
Modulus of Elasticity 72 GPa
Thermal Conductivity 134-160 W/m.K
Electrical Resistivity 40 % IACS
'Typical' Physical Properties are given

Mechanical Properties

These Mechanical Properties are for Bar in the T73 temper

Diameter (mm) Proof Strength (Min) Tensile Strength (Min) Elongation % (Min)
Up to & incl. 6.3 400 469 7
Over 6.3 up to & incl. 38 420 483 8
Over 38 up to & incl. 76.2 407 476 8
Over 76.2 up to & incl. 114 393 469 7