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Solder Alloy 121 vs. ZK51A Magnesium

Solder alloy 121 belongs to the otherwise unclassified metals classification, while ZK51A magnesium belongs to the magnesium alloys. There are 24 material properties with values for both materials. Properties with values for just one material (8, 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 ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 21
45
Elongation at Break, % 25
4.7
Poisson's Ratio 0.43
0.29
Shear Modulus, GPa 7.5
18
Tensile Strength: Ultimate (UTS), MPa 32
240

Thermal Properties

Latent Heat of Fusion, J/g 29
340
Melting Completion (Liquidus), °C 290
640
Melting Onset (Solidus), °C 230
550
Specific Heat Capacity, J/kg-K 140
970
Thermal Conductivity, W/m-K 31
110
Thermal Expansion, µm/m-K 28
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.8
28
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
140

Otherwise Unclassified Properties

Base Metal Price, % relative 80
13
Density, g/cm3 11
1.8
Embodied Carbon, kg CO2/kg material 5.6
24
Embodied Energy, MJ/kg 93
160
Embodied Water, L/kg 580
940

Common Calculations

Stiffness to Weight: Axial, points 1.1
14
Stiffness to Weight: Bending, points 8.6
64
Strength to Weight: Axial, points 0.84
36
Strength to Weight: Bending, points 2.1
47
Thermal Diffusivity, mm2/s 20
61
Thermal Shock Resistance, points 3.9
15

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0
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
Lead (Pb), % 83.4 to 85.5
0
Magnesium (Mg), % 0
93.1 to 95.9
Nickel (Ni), % 0 to 0.010
0 to 0.010
Silver (Ag), % 0 to 0.1
0
Tin (Sn), % 14.5 to 15.5
0
Zinc (Zn), % 0 to 0.0010
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3