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AZ91B Magnesium vs. Z21721 Zinc

AZ91B magnesium belongs to the magnesium alloys classification, while Z21721 zinc belongs to the zinc alloys. There are 28 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 AZ91B magnesium and the bottom bar is Z21721 zinc.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
87
Elongation at Break, % 5.0
40
Poisson's Ratio 0.29
0.25
Shear Modulus, GPa 18
35
Tensile Strength: Ultimate (UTS), MPa 240
150
Tensile Strength: Yield (Proof), MPa 160
120

Thermal Properties

Latent Heat of Fusion, J/g 360
110
Maximum Temperature: Mechanical, °C 130
90
Melting Completion (Liquidus), °C 600
410
Melting Onset (Solidus), °C 470
390
Specific Heat Capacity, J/kg-K 990
390
Thermal Conductivity, W/m-K 73
110
Thermal Expansion, µm/m-K 26
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
27
Electrical Conductivity: Equal Weight (Specific), % IACS 58
37

Otherwise Unclassified Properties

Base Metal Price, % relative 12
11
Density, g/cm3 1.7
6.6
Embodied Carbon, kg CO2/kg material 22
2.8
Embodied Energy, MJ/kg 160
53
Embodied Water, L/kg 990
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
57
Resilience: Unit (Modulus of Resilience), kJ/m3 280
88
Stiffness to Weight: Axial, points 15
7.3
Stiffness to Weight: Bending, points 69
22
Strength to Weight: Axial, points 38
6.4
Strength to Weight: Bending, points 49
9.6
Thermal Diffusivity, mm2/s 42
44
Thermal Shock Resistance, points 14
4.8

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.0020
Cadmium (Cd), % 0
0 to 0.070
Copper (Cu), % 0 to 0.35
0 to 0.0050
Iron (Fe), % 0
0 to 0.010
Lead (Pb), % 0
0 to 1.0
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0
Titanium (Ti), % 0
0 to 0.020
Zinc (Zn), % 0.35 to 1.0
98.9 to 100