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AZ91B Magnesium vs. Solder Alloy 121

AZ91B magnesium belongs to the magnesium 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 (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 AZ91B magnesium and the bottom bar is solder alloy 121.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
11
Elastic (Young's, Tensile) Modulus, GPa 46
21
Elongation at Break, % 5.0
25
Poisson's Ratio 0.29
0.43
Shear Modulus, GPa 18
7.5
Tensile Strength: Ultimate (UTS), MPa 240
32

Thermal Properties

Latent Heat of Fusion, J/g 360
29
Melting Completion (Liquidus), °C 600
290
Melting Onset (Solidus), °C 470
230
Specific Heat Capacity, J/kg-K 990
140
Thermal Conductivity, W/m-K 73
31
Thermal Expansion, µm/m-K 26
28

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
8.8
Electrical Conductivity: Equal Weight (Specific), % IACS 58
7.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
80
Density, g/cm3 1.7
11
Embodied Carbon, kg CO2/kg material 22
5.6
Embodied Energy, MJ/kg 160
93
Embodied Water, L/kg 990
580

Common Calculations

Stiffness to Weight: Axial, points 15
1.1
Stiffness to Weight: Bending, points 69
8.6
Strength to Weight: Axial, points 38
0.84
Strength to Weight: Bending, points 49
2.1
Thermal Diffusivity, mm2/s 42
20
Thermal Shock Resistance, points 14
3.9

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
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
Copper (Cu), % 0 to 0.35
0 to 0.080
Gold (Au), % 0
0 to 0.050
Indium (In), % 0
0 to 0.1
Iron (Fe), % 0
0 to 0.020
Lead (Pb), % 0
83.4 to 85.5
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0 to 0.010
Silicon (Si), % 0 to 0.5
0
Silver (Ag), % 0
0 to 0.1
Tin (Sn), % 0
14.5 to 15.5
Zinc (Zn), % 0.35 to 1.0
0 to 0.0010