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6081 Aluminum vs. ASTM B685 Alloy

6081 aluminum belongs to the aluminum alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 6081 aluminum and the bottom bar is ASTM B685 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
120
Poisson's Ratio 0.33
0.37
Shear Modulus, GPa 26
43
Tensile Strength: Ultimate (UTS), MPa 310
660 to 1060

Thermal Properties

Latent Heat of Fusion, J/g 410
180
Melting Completion (Liquidus), °C 640
1230
Melting Onset (Solidus), °C 610
1200
Specific Heat Capacity, J/kg-K 900
300
Thermal Expansion, µm/m-K 23
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 47
5.0
Electrical Conductivity: Equal Weight (Specific), % IACS 160
4.1

Otherwise Unclassified Properties

Density, g/cm3 2.7
11

Common Calculations

Stiffness to Weight: Axial, points 14
6.1
Stiffness to Weight: Bending, points 50
15
Strength to Weight: Axial, points 32
17 to 27
Strength to Weight: Bending, points 37
16 to 21
Thermal Shock Resistance, points 14
28 to 46

Alloy Composition

Aluminum (Al), % 96.3 to 98.6
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 0 to 0.1
39.5 to 40.5
Iron (Fe), % 0 to 0.5
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Magnesium (Mg), % 0.6 to 1.0
0
Manganese (Mn), % 0.1 to 0.45
0
Palladium (Pd), % 0
59 to 60.5
Silicon (Si), % 0.7 to 1.1
0
Silver (Ag), % 0
0 to 0.1
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.2
0 to 0.060
Residuals, % 0
0 to 0.2