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Solder Alloy 121 vs. 324.0 Aluminum

Solder alloy 121 belongs to the otherwise unclassified metals classification, while 324.0 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 121 and the bottom bar is 324.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 21
71
Elongation at Break, % 25
3.0 to 4.0
Poisson's Ratio 0.43
0.33
Shear Modulus, GPa 7.5
27
Tensile Strength: Ultimate (UTS), MPa 32
210 to 310

Thermal Properties

Latent Heat of Fusion, J/g 29
500
Melting Completion (Liquidus), °C 290
610
Melting Onset (Solidus), °C 230
550
Specific Heat Capacity, J/kg-K 140
900
Thermal Conductivity, W/m-K 31
150
Thermal Expansion, µm/m-K 28
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.8
34
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
120

Otherwise Unclassified Properties

Base Metal Price, % relative 80
9.5
Density, g/cm3 11
2.7
Embodied Carbon, kg CO2/kg material 5.6
7.9
Embodied Energy, MJ/kg 93
150
Embodied Water, L/kg 580
1090

Common Calculations

Stiffness to Weight: Axial, points 1.1
15
Stiffness to Weight: Bending, points 8.6
52
Strength to Weight: Axial, points 0.84
22 to 32
Strength to Weight: Bending, points 2.1
29 to 38
Thermal Diffusivity, mm2/s 20
62
Thermal Shock Resistance, points 3.9
9.7 to 14

Alloy Composition

Aluminum (Al), % 0 to 0.0010
87.3 to 92.2
Antimony (Sb), % 0 to 0.5
0
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0 to 0.25
0
Cadmium (Cd), % 0 to 0.0050
0
Copper (Cu), % 0 to 0.080
0.4 to 0.6
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 1.2
Lead (Pb), % 83.4 to 85.5
0
Magnesium (Mg), % 0
0.4 to 0.7
Manganese (Mn), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.010
0 to 0.3
Silicon (Si), % 0
7.0 to 8.0
Silver (Ag), % 0 to 0.1
0
Tin (Sn), % 14.5 to 15.5
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0 to 0.0010
0 to 1.0
Residuals, % 0
0 to 0.2