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Solder Alloy 121 vs. EN AC-45100 Aluminum

Solder alloy 121 belongs to the otherwise unclassified metals classification, while EN AC-45100 aluminum belongs to the aluminum alloys. There are 25 material properties with values for both materials. Properties with values for just one material (5, 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 EN AC-45100 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 11
97 to 130
Elastic (Young's, Tensile) Modulus, GPa 21
72
Elongation at Break, % 25
1.0 to 2.8
Poisson's Ratio 0.43
0.33
Shear Modulus, GPa 7.5
27
Tensile Strength: Ultimate (UTS), MPa 32
300 to 360

Thermal Properties

Latent Heat of Fusion, J/g 29
470
Melting Completion (Liquidus), °C 290
630
Melting Onset (Solidus), °C 230
550
Specific Heat Capacity, J/kg-K 140
890
Thermal Conductivity, W/m-K 31
140
Thermal Expansion, µm/m-K 28
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.8
30
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
95

Otherwise Unclassified Properties

Base Metal Price, % relative 80
10
Density, g/cm3 11
2.8
Embodied Carbon, kg CO2/kg material 5.6
7.9
Embodied Energy, MJ/kg 93
150
Embodied Water, L/kg 580
1100

Common Calculations

Stiffness to Weight: Axial, points 1.1
14
Stiffness to Weight: Bending, points 8.6
49
Strength to Weight: Axial, points 0.84
30 to 35
Strength to Weight: Bending, points 2.1
35 to 39
Thermal Diffusivity, mm2/s 20
54
Thermal Shock Resistance, points 3.9
14 to 16

Alloy Composition

Aluminum (Al), % 0 to 0.0010
88 to 92.8
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
2.6 to 3.6
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 0.6
Lead (Pb), % 83.4 to 85.5
0 to 0.1
Magnesium (Mg), % 0
0.15 to 0.45
Manganese (Mn), % 0
0 to 0.55
Nickel (Ni), % 0 to 0.010
0 to 0.1
Silicon (Si), % 0
4.5 to 6.0
Silver (Ag), % 0 to 0.1
0
Tin (Sn), % 14.5 to 15.5
0 to 0.050
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0 to 0.0010
0 to 0.2
Residuals, % 0
0 to 0.15