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ASTM B780 Alloy vs. 2025 Aluminum

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while 2025 aluminum belongs to the aluminum alloys. There are 17 material properties with values for both materials. Properties with values for just one material (14, 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 ASTM B780 alloy and the bottom bar is 2025 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 83
72
Elongation at Break, % 1.1 to 9.1
15
Poisson's Ratio 0.36
0.33
Shear Modulus, GPa 30
27
Shear Strength, MPa 200 to 340
240
Tensile Strength: Ultimate (UTS), MPa 330 to 590
400

Thermal Properties

Latent Heat of Fusion, J/g 140
400
Specific Heat Capacity, J/kg-K 270
870
Thermal Expansion, µm/m-K 18
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 70 to 76
40
Electrical Conductivity: Equal Weight (Specific), % IACS 62 to 68
120

Otherwise Unclassified Properties

Density, g/cm3 10
3.0

Common Calculations

Stiffness to Weight: Axial, points 4.5
13
Stiffness to Weight: Bending, points 14
46
Strength to Weight: Axial, points 9.1 to 16
37
Strength to Weight: Bending, points 11 to 15
40
Thermal Shock Resistance, points 16 to 29
18

Alloy Composition

Aluminum (Al), % 0
90.9 to 95.2
Cadmium (Cd), % 0 to 0.050
0
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 23.5 to 25.7
3.9 to 5.0
Iron (Fe), % 0 to 0.050
0 to 1.0
Lead (Pb), % 0 to 0.030
0
Magnesium (Mg), % 0
0 to 0.050
Manganese (Mn), % 0
0.4 to 1.2
Nickel (Ni), % 0.35 to 0.65
0
Silicon (Si), % 0
0.5 to 1.2
Silver (Ag), % 74 to 76
0
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0 to 0.060
0 to 0.25
Residuals, % 0
0 to 0.15