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7178 Aluminum vs. Solder Alloy 704

7178 aluminum belongs to the aluminum alloys classification, while solder alloy 704 belongs to the otherwise unclassified metals. There are 22 material properties with values for both materials. Properties with values for just one material (9, 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 solder alloy 704.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
51
Elongation at Break, % 4.5 to 12
30
Poisson's Ratio 0.32
0.36
Shear Modulus, GPa 27
19
Tensile Strength: Ultimate (UTS), MPa 240 to 640
55

Thermal Properties

Latent Heat of Fusion, J/g 370
62
Melting Completion (Liquidus), °C 630
240
Melting Onset (Solidus), °C 480
220
Specific Heat Capacity, J/kg-K 860
220
Thermal Conductivity, W/m-K 130
50
Thermal Expansion, µm/m-K 23
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
13
Electrical Conductivity: Equal Weight (Specific), % IACS 91
15

Otherwise Unclassified Properties

Density, g/cm3 3.1
7.5
Embodied Carbon, kg CO2/kg material 8.2
19
Embodied Energy, MJ/kg 150
320

Common Calculations

Stiffness to Weight: Axial, points 13
3.8
Stiffness to Weight: Bending, points 45
17
Strength to Weight: Axial, points 21 to 58
2.1
Strength to Weight: Bending, points 28 to 54
4.3
Thermal Diffusivity, mm2/s 47
30
Thermal Shock Resistance, points 10 to 28
3.5

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0 to 0.0010
Antimony (Sb), % 0
0 to 0.1
Arsenic (As), % 0
0 to 0.030
Bismuth (Bi), % 0
0 to 0.1
Cadmium (Cd), % 0
0 to 0.0020
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
0 to 0.050
Gold (Au), % 0
0 to 0.050
Indium (In), % 0
0 to 0.1
Iron (Fe), % 0 to 0.5
0 to 0.020
Lead (Pb), % 0
0 to 0.070
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.4
0
Silver (Ag), % 0
4.8 to 5.2
Tin (Sn), % 0
94.3 to 95.2
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0 to 0.0010
Residuals, % 0 to 0.15
0