Aluminum 7178-T6; 7178-T651

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-T6; Aluminium 7178-T651; AA7178-T651; AA7178-T6

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	160	160	500 kg load with 10 mm ball
Hardness, Knoop	205	205	Converted from Brinell Hardness Value
Hardness, Rockwell A	55.3	55.3	Converted from Brinell Hardness Value
Hardness, Rockwell B	90	90	Converted from Brinell Hardness Value
Hardness, Vickers	189	189	Converted from Brinell Hardness Value
Ultimate Tensile Strength	607 MPa	88000 psi	AA; Typical
Tensile Yield Strength	538 MPa	78000 psi	AA; Typical
Elongation at Break	10 %	10 %	AA; Typical; 1/16 in. (1.6 mm) Thickness
Elongation at Break	11 %	11 %	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.
Compressive Yield Strength	530 MPa	76900 psi	0.1% Permanent Set
Notched Tensile Strength	386 MPa	56000 psi	2.5 cm width x 0.16 cm thick side-notched specimen, Kt = 17.
Ultimate Bearing Strength	1089 MPa	158000 psi	Edge distance/pin diameter = 2.0
Bearing Yield Strength	807 MPa	117000 psi	Edge distance/pin diameter = 2.0
Poisson's Ratio	0.33	0.33	Estimated from trends in similar Al alloys.
Fatigue Strength	150 MPa	21800 psi	500,000,000 Cycles
Machinability	70 %	70 %	0-100 Scale of Aluminum Alloys
Shear Modulus	27 GPa	3920 ksi	Estimated from similar Al alloys.
Shear Strength	360 MPa	52200 psi
Electrical Properties
Electrical Resistivity	5.49e-006 ohm-cm	5.49e-006 ohm-cm	AA; Typical at 68°F
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	125 W/m-K	870 BTU-in/hr-ft²-°F	AA; Typical at 77°F
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
Aging Temperature	121 °C	250 °F	for 24 hr

References for this datasheet.