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7178 Aluminum vs. ASTM B780 Alloy

7178 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 7178 aluminum and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
83
Elongation at Break, % 4.5 to 12
1.1 to 9.1
Poisson's Ratio 0.32
0.36
Shear Modulus, GPa 27
30
Shear Strength, MPa 140 to 380
200 to 340
Tensile Strength: Ultimate (UTS), MPa 240 to 640
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 370
140
Specific Heat Capacity, J/kg-K 860
270
Thermal Expansion, µm/m-K 23
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
70 to 76
Electrical Conductivity: Equal Weight (Specific), % IACS 91
62 to 68

Otherwise Unclassified Properties

Density, g/cm3 3.1
10

Common Calculations

Stiffness to Weight: Axial, points 13
4.5
Stiffness to Weight: Bending, points 45
14
Strength to Weight: Axial, points 21 to 58
9.1 to 16
Strength to Weight: Bending, points 28 to 54
11 to 15
Thermal Shock Resistance, points 10 to 28
16 to 29

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Cadmium (Cd), % 0
0 to 0.050
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
23.5 to 25.7
Iron (Fe), % 0 to 0.5
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0
Nickel (Ni), % 0
0.35 to 0.65
Silicon (Si), % 0 to 0.4
0
Silver (Ag), % 0
74 to 76
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0 to 0.060
Residuals, % 0 to 0.15
0

Comparable Variants