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Solder Alloy 121 vs. ISO-WD32350 Magnesium

Solder alloy 121 belongs to the otherwise unclassified metals classification, while ISO-WD32350 magnesium belongs to the magnesium 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 121 and the bottom bar is ISO-WD32350 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 21
45
Elongation at Break, % 25
5.7 to 10
Poisson's Ratio 0.43
0.29
Shear Modulus, GPa 7.5
18
Tensile Strength: Ultimate (UTS), MPa 32
250 to 290

Thermal Properties

Latent Heat of Fusion, J/g 29
340
Melting Completion (Liquidus), °C 290
600
Melting Onset (Solidus), °C 230
560
Specific Heat Capacity, J/kg-K 140
990
Thermal Conductivity, W/m-K 31
130
Thermal Expansion, µm/m-K 28
25

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.8
25
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
130

Otherwise Unclassified Properties

Base Metal Price, % relative 80
12
Density, g/cm3 11
1.7
Embodied Carbon, kg CO2/kg material 5.6
23
Embodied Energy, MJ/kg 93
160
Embodied Water, L/kg 580
960

Common Calculations

Stiffness to Weight: Axial, points 1.1
15
Stiffness to Weight: Bending, points 8.6
68
Strength to Weight: Axial, points 0.84
39 to 46
Strength to Weight: Bending, points 2.1
50 to 55
Thermal Diffusivity, mm2/s 20
73
Thermal Shock Resistance, points 3.9
16 to 18

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.1
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 to 0.1
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 0.060
Lead (Pb), % 83.4 to 85.5
0
Magnesium (Mg), % 0
95.7 to 97.7
Manganese (Mn), % 0
0.6 to 1.3
Nickel (Ni), % 0 to 0.010
0 to 0.0050
Silicon (Si), % 0
0 to 0.1
Silver (Ag), % 0 to 0.1
0
Tin (Sn), % 14.5 to 15.5
0
Zinc (Zn), % 0 to 0.0010
1.8 to 2.3
Residuals, % 0
0 to 0.3