AA Standards Grade 7178 T6: High-Strength Magnesium-Copper Alloy for Advanced Metalworking

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	Condition	Related Standards
Density	2.83 g/cm³	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316

Mechanical

Property	Value	Condition	Related Standards	Comment
Elastic modulus	72.0 GPa	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
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	565.0 MPa	T6	AA Standards, ASTM B221, ASTM B241
	570.0 MPa	T6	AA Standards, ASTM B209
	580.0 MPa	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
	595.0 MPa	T6	AA Standards, ASTM B221
	600.0 MPa	T6	AA Standards, ASTM B221, ASTM B241
	605.0 MPa	T6	AA Standards

Thermal

Property	Temperature	Value	Condition	Related Standards	Comment
Coefficient of thermal expansion	20 °C	2.3399999999999996e-05 1/K	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
	100 °C	2.3399999999999996e-05 1/K	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
Melting point		475.0 - 630.0 °C	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
Specific heat capacity		795.0 - 1050.0 J/(kg·K)			Typical for Wrought 7000 Series Aluminium
Thermal conductivity		126 W/(m·K)	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316

Electrical

Property	Value	Condition	Related Standards
Electrical conductivity	18000000.0 S/m	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
Electrical resistivity	5.56e-08 Ω·m	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316

Chemical properties

Property	Value	Condition	Related Standards
Chromium	0.18 - 0.28 %	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
Copper	1.6 - 2.4 %	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
Iron	0.50 %	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
Magnesium	2.4 - 3.1 %	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
Manganese	0.3 %	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
Silicon	0.4 %	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
Titanium	0.2 %	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316
Zinc	6.3 - 7.3 %	T6	AA Standards, ASTM B209, ASTM B221, ASTM B241, ASTM B316

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

EN 573-3 Grade 3.1355 (T8511) – High-Strength Aluminum Alloy for Aerospace Applications AA 7178 T62: Premium 7000-Series Aluminium Alloy for Strength & Versatility

Metal