AA 7178 T7651 – Premium 7000-Series Aluminium Alloy

AA 7178, comprised of copper and magnesium as its primary alloying elements, offers uncompromising strength and accommodates a number of different metalworking processes. These processes include machining, welding, and heat treating.

Properties

General

Property	Value	Comment
Density	2.7 - 2.85 g/cm³	Typical for Wrought 7000 Series Aluminium

Mechanical

Property	Value	Condition	Related Standards	Comment
Elastic modulus	69.0 - 72.0 GPa			Typical for Wrought 7000 Series Aluminium
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	500.0 MPa	T7651	AA Standards, ASTM B209
	510.0 MPa	T7651	AA Standards, ASTM B209
	570.0 MPa	T7651	AA Standards

Thermal

Property	Value	Comment
Coefficient of thermal expansion	2.1e-05 - 2.4e-05 1/K	Typical for Wrought 7000 Series Aluminium
Melting point	465.0 - 655.0 °C	Typical for Wrought 7000 Series Aluminium
Specific heat capacity	795.0 - 1050.0 J/(kg·K)	Typical for Wrought 7000 Series Aluminium
Thermal conductivity	121.0 - 170.0 W/(m·K)	Typical for Wrought 7000 Series Aluminium

Electrical

Property	Value	Comment
Electrical conductivity	18000000.0 - 34000000.0 S/m	Typical for Wrought 7000 Series Aluminium
Electrical resistivity	2.9e-08 - 5.6e-08 Ω·m	Typical for Wrought 7000 Series Aluminium

Chemical properties

Property	Value	Condition	Related Standards
Chromium	0.18 - 0.28 %	T7651	AA Standards, ASTM B209
Copper	1.6 - 2.4 %	T7651	AA Standards, ASTM B209
Iron	0.50 %	T7651	AA Standards, ASTM B209
Magnesium	2.4 - 3.1 %	T7651	AA Standards, ASTM B209
Manganese	0.3 %	T7651	AA Standards, ASTM B209
Silicon	0.4 %	T7651	AA Standards, ASTM B209
Titanium	0.2 %	T7651	AA Standards, ASTM B209
Zinc	6.3 - 7.3 %	T7651	AA Standards, ASTM B209

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 7178 T76 – High‑Strength Magnesium Alloy for Advanced Metalworking AA 7178 – High-Strength 7000 Series Aluminium Alloy for Advanced Metalworking

Metal