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Solder Alloy 124 vs. 7021 Aluminum

Solder alloy 124 belongs to the otherwise unclassified metals classification, while 7021 aluminum belongs to the aluminum alloys. There are 24 material properties with values for both materials. Properties with values for just one material (6, 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 solder alloy 124 and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 17
69
Elongation at Break, % 46
9.4
Poisson's Ratio 0.44
0.32
Shear Modulus, GPa 5.8
26
Tensile Strength: Ultimate (UTS), MPa 27
460

Thermal Properties

Latent Heat of Fusion, J/g 24
380
Melting Completion (Liquidus), °C 330
630
Melting Onset (Solidus), °C 320
510
Specific Heat Capacity, J/kg-K 130
870
Thermal Conductivity, W/m-K 22
150
Thermal Expansion, µm/m-K 29
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.6
38
Electrical Conductivity: Equal Weight (Specific), % IACS 7.7
120

Otherwise Unclassified Properties

Base Metal Price, % relative 70
9.5
Density, g/cm3 11
2.9
Embodied Carbon, kg CO2/kg material 4.1
8.3
Embodied Energy, MJ/kg 68
150
Embodied Water, L/kg 470
1140

Common Calculations

Stiffness to Weight: Axial, points 0.83
13
Stiffness to Weight: Bending, points 7.6
47
Strength to Weight: Axial, points 0.65
44
Strength to Weight: Bending, points 1.8
45
Thermal Diffusivity, mm2/s 15
59
Thermal Shock Resistance, points 3.9
20

Alloy Composition

Aluminum (Al), % 0 to 0.0010
90.7 to 93.7
Antimony (Sb), % 0 to 0.12
0
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0 to 0.1
0
Cadmium (Cd), % 0 to 0.0020
0
Chromium (Cr), % 0
0 to 0.050
Copper (Cu), % 0 to 0.080
0 to 0.25
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 0.4
Lead (Pb), % 97.2 to 98.2
0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0
0 to 0.1
Nickel (Ni), % 0 to 0.010
0
Silicon (Si), % 0
0 to 0.25
Silver (Ag), % 0 to 0.1
0
Tin (Sn), % 1.8 to 2.2
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0 to 0.0010
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15