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Solder Alloy 124 vs. 7020 Aluminum

Solder alloy 124 belongs to the otherwise unclassified metals classification, while 7020 aluminum belongs to the aluminum alloys. There are 24 material properties with values for both materials. Properties with values for just one material (7, 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 7020 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 17
70
Elongation at Break, % 46
8.4 to 14
Poisson's Ratio 0.44
0.33
Shear Modulus, GPa 5.8
26
Tensile Strength: Ultimate (UTS), MPa 27
190 to 390

Thermal Properties

Latent Heat of Fusion, J/g 24
380
Melting Completion (Liquidus), °C 330
650
Melting Onset (Solidus), °C 320
610
Specific Heat Capacity, J/kg-K 130
880
Thermal Conductivity, W/m-K 22
150
Thermal Expansion, µm/m-K 29
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.6
39
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
1150

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
18 to 37
Strength to Weight: Bending, points 1.8
25 to 41
Thermal Diffusivity, mm2/s 15
59
Thermal Shock Resistance, points 3.9
8.3 to 17

Alloy Composition

Aluminum (Al), % 0 to 0.0010
91.2 to 94.8
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
0.1 to 0.35
Copper (Cu), % 0 to 0.080
0 to 0.2
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
1.0 to 1.4
Manganese (Mn), % 0
0.050 to 0.5
Nickel (Ni), % 0 to 0.010
0
Silicon (Si), % 0
0 to 0.35
Silver (Ag), % 0 to 0.1
0
Tin (Sn), % 1.8 to 2.2
0
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0 to 0.0010
4.0 to 5.0
Zirconium (Zr), % 0
0.080 to 0.25
Residuals, % 0
0 to 0.15