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2018 Aluminum vs. Solder Alloy 121

2018 aluminum belongs to the aluminum alloys classification, while solder alloy 121 belongs to the otherwise unclassified metals. There are 25 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 2018 aluminum and the bottom bar is solder alloy 121.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
11
Elastic (Young's, Tensile) Modulus, GPa 73
21
Elongation at Break, % 9.6
25
Poisson's Ratio 0.33
0.43
Shear Modulus, GPa 27
7.5
Tensile Strength: Ultimate (UTS), MPa 420
32

Thermal Properties

Latent Heat of Fusion, J/g 390
29
Melting Completion (Liquidus), °C 640
290
Melting Onset (Solidus), °C 510
230
Specific Heat Capacity, J/kg-K 870
140
Thermal Conductivity, W/m-K 150
31
Thermal Expansion, µm/m-K 22
28

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
8.8
Electrical Conductivity: Equal Weight (Specific), % IACS 120
7.4

Otherwise Unclassified Properties

Base Metal Price, % relative 11
80
Density, g/cm3 3.1
11
Embodied Carbon, kg CO2/kg material 8.1
5.6
Embodied Energy, MJ/kg 150
93
Embodied Water, L/kg 1130
580

Common Calculations

Stiffness to Weight: Axial, points 13
1.1
Stiffness to Weight: Bending, points 45
8.6
Strength to Weight: Axial, points 38
0.84
Strength to Weight: Bending, points 41
2.1
Thermal Diffusivity, mm2/s 57
20
Thermal Shock Resistance, points 19
3.9

Alloy Composition

Aluminum (Al), % 89.7 to 94.4
0 to 0.0010
Antimony (Sb), % 0
0 to 0.5
Arsenic (As), % 0
0 to 0.030
Bismuth (Bi), % 0
0 to 0.25
Cadmium (Cd), % 0
0 to 0.0050
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
0 to 0.080
Gold (Au), % 0
0 to 0.050
Indium (In), % 0
0 to 0.1
Iron (Fe), % 0 to 1.0
0 to 0.020
Lead (Pb), % 0
83.4 to 85.5
Magnesium (Mg), % 0.45 to 0.9
0
Manganese (Mn), % 0 to 0.2
0
Nickel (Ni), % 1.7 to 2.3
0 to 0.010
Silicon (Si), % 0 to 0.9
0
Silver (Ag), % 0
0 to 0.1
Tin (Sn), % 0
14.5 to 15.5
Zinc (Zn), % 0 to 0.25
0 to 0.0010
Residuals, % 0 to 0.15
0