AA 7475 (T7351) – High‑Toughness Aluminum Alloy for Advanced Engineering

AA 7475, derived from Aluminum 7075, provides excellent toughness for a broad variety of applications. This alloy offers several metalworking options that include machining, forming, and heat treating. For machining, AA 7475 functions best in the annealed condition and should be used with oil-based lubricants. It is also most easily formed in the annealed condition, as its hardened state results in spring-back. This alloy is typically available in flat rolled products, and it is widely used for applications that require high strength, including planes and other aerospace assemblies.

Properties

General

Property	Value	Condition	Related Standards
Density	2.81 g/cm³	T7351	AA Standards

Mechanical

Property	Value	Condition	Related Standards	Comment
Elastic modulus	70.0 GPa	T7351	AA Standards
Plane-Strain Fracture Toughnes	22.0 - 35.0 MPa·√m			Typical for Wrought 7000 Series Aluminium
Poisson's ratio	0.33 [-]			Typical for Wrought 7000 Series Aluminium
Shear modulus	26.4 - 27.1 GPa			Typical for Wrought 7000 Series Aluminium
Tensile strength	495.0 MPa	T7351	AA Standards

Thermal

Property	Temperature	Value	Condition	Related Standards	Comment
Coefficient of thermal expansion	20 °C	2.3199999999999998e-05 1/K	T7351	AA Standards
	100 °C	2.3199999999999998e-05 1/K	T7351	AA Standards
Melting point		475.0 - 635.0 °C	T7351	AA Standards
Specific heat capacity		795.0 - 1050.0 J/(kg·K)			Typical for Wrought 7000 Series Aluminium
Thermal conductivity		138.0 - 163.0 W/(m·K)	T7351	AA Standards

Electrical

Property	Value	Condition	Related Standards
Electrical conductivity	20000000.0 - 24000000.0 S/m	T7351	AA Standards
Electrical resistivity	4.17e-08 - 5e-08 Ω·m	T7351	AA Standards

Chemical properties

Property	Value	Condition	Related Standards
Chromium	0.18 - 0.25 %	T7351	AA Standards
Copper	1.2 - 1.9 %	T7351	AA Standards
Iron	0.12 %	T7351	AA Standards
Magnesium	1.9 - 2.6 %	T7351	AA Standards
Manganese	0.06 %	T7351	AA Standards
Silicon	0.1 %	T7351	AA Standards
Titanium	0.06 %	T7351	AA Standards
Zinc	5.2 - 6.2 %	T7351	AA Standards

Technological properties

Property
Brazing	general: no brazing is known or developed
Corrosion properties	Stress corrosion cracking: Operational damage in areas with tensile stresses transverse to the grain structure, limited damage to laboratory samples, general: good, without protection in industrial or seawater atmosphere
General machinability	General: good to acceptable
Workability	general (condition): not suitable

AA 7475 T651: High-Toughness Aluminum Alloy for Versatile Applications AA 7475 T761: High-Performance Aluminum Alloy for Tough Applications

Metal