Strength in numbers

Aluminium Alloy   |   ASTM & FED-QQ

QQ-A-225/9 T651 Bar

AerospaceQQ-A-225/9 T651 Commercial7075

A high strength aerospace aluminium alloy offering good corrosion resistance.

Chemical Composition

SAE AMS QQ-A-225/9
Alloy QQ A 225/9
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

Temper Types

Alloy QQ-A-225/9 is supplied in a range of tempers:

  • T651
  • T7351

Supplied Forms

Alloy QQ-A-225/9 T6511 is supplied in bar/rod

  • Bar

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

SAE AMS QQ-A-225/9
Bar - 12.7mm to 101.6mm
Mechanical Property Value
Proof Stress 455 Min MPa
Tensile Strength 531 Min MPa
Elongation A50 mm 7 Min %

Mechanical Properties are for T651 temper Bar in diameters 12.7mm to 101mm