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6081 Aluminum vs. ASTM B780 Alloy

6081 aluminum belongs to the aluminum alloys classification, while ASTM B780 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 B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
83
Elongation at Break, % 9.0
1.1 to 9.1
Poisson's Ratio 0.33
0.36
Shear Modulus, GPa 26
30
Shear Strength, MPa 180
200 to 340
Tensile Strength: Ultimate (UTS), MPa 310
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 410
140
Specific Heat Capacity, J/kg-K 900
270
Thermal Expansion, µm/m-K 23
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 47
70 to 76
Electrical Conductivity: Equal Weight (Specific), % IACS 160
62 to 68

Otherwise Unclassified Properties

Density, g/cm3 2.7
10

Common Calculations

Stiffness to Weight: Axial, points 14
4.5
Stiffness to Weight: Bending, points 50
14
Strength to Weight: Axial, points 32
9.1 to 16
Strength to Weight: Bending, points 37
11 to 15
Thermal Shock Resistance, points 14
16 to 29

Alloy Composition

Aluminum (Al), % 96.3 to 98.6
0
Cadmium (Cd), % 0
0 to 0.050
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 0 to 0.1
23.5 to 25.7
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
Nickel (Ni), % 0
0.35 to 0.65
Silicon (Si), % 0.7 to 1.1
0
Silver (Ag), % 0
74 to 76
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.2
0 to 0.060
Residuals, % 0 to 0.15
0