Aluminum 7178-O

Subcategory: 7000 Series Aluminum Alloy; Aluminum Alloy; Metal; Nonferrous Metal

Close Analogs:

Composition Notes:
This designation is considered the sole original alloy for this alloy family.
Aluminum content reported is calculated as remainder.
Composition information provided by the Aluminum Association and is not for design.

Key Words: UNS A97178; Aluminium 7178-O; AA7178-O

Component    Wt. % Al 85.3 - 89.5   Cr 0.18 - 0.28   Cu 1.6 - 2.4   Fe Max 0.5

Component    Wt. % Mg 2.4 - 3.1   Mn Max 0.3   Other, each Max 0.05   Other, total Max 0.15

Component    Wt. % Si Max 0.4   Ti Max 0.2   Zn 6.3 - 7.3

Material Notes:
Data points with the AA note have been provided by the Aluminum Association, Inc. and are NOT FOR DESIGN.

Physical Properties	Metric	English	Comments
Density	2.83 g/cc	0.102 lb/in³	AA; Typical
Mechanical Properties
Hardness, Brinell	60	60	500 kg load with 10 mm ball
Hardness, Knoop	80	80	Converted from Brinell Hardness Value
Hardness, Vickers	68	68	Converted from Brinell Hardness Value
Ultimate Tensile Strength	228 MPa	33000 psi	AA; Typical
Tensile Yield Strength	103 MPa	15000 psi	AA; Typical
Elongation at Break	15 %	15 %	AA; Typical; 1/16 in. (1.6 mm) Thickness
Elongation at Break	16 %	16 %	AA; Typical; 1/2 in. (12.7 mm) Diameter
Modulus of Elasticity	71.7 GPa	10400 ksi	AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.
Poisson's Ratio	0.33	0.33	Estimated from trends in similar Al alloys.
Shear Modulus	27 GPa	3920 ksi	Estimated from similar Al alloys.
Shear Strength	150 MPa	21800 psi
Electrical Properties
Electrical Resistivity	4.6e-006 ohm-cm	4.6e-006 ohm-cm	Estimated from other heat treatments.
Thermal Properties
CTE, linear 68°F	23.4 µm/m-°C	13 µin/in-°F	AA; Typical; Average over 68-212°F range.
CTE, linear 250°C	25.4 µm/m-°C	14.1 µin/in-°F	Average over the range 20-300ºC
Specific Heat Capacity	0.856 J/g-°C	0.205 BTU/lb-°F
Thermal Conductivity	150 W/m-K	1040 BTU-in/hr-ft²-°F	Estimated from other heat treatments.
Melting Point	477 - 629 °C	890 - 1165 °F	AA; Typical range based on typical composition for wrought products 1/4 inch thickness or greater. Homogenization may raise eutectic melting temperature 20-40°F but usually does not eliminate eutectic melting.
Solidus	477 °C	890 °F	AA; Typical
Liquidus	629 °C	1165 °F	AA; Typical
Processing Properties
Annealing Temperature	413 °C	775 °F
Solution Temperature	468 °C	875 °F

References for this datasheet.