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AZ91A Magnesium vs. Commercially Pure Zinc

AZ91A magnesium belongs to the magnesium alloys classification, while commercially pure 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 AZ91A magnesium and the bottom bar is commercially pure zinc.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
87
Elongation at Break, % 5.0
38
Poisson's Ratio 0.29
0.25
Shear Modulus, GPa 18
35
Tensile Strength: Ultimate (UTS), MPa 240
97
Tensile Strength: Yield (Proof), MPa 160
79

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
400
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 10
27
Electrical Conductivity: Equal Weight (Specific), % IACS 52
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
34
Resilience: Unit (Modulus of Resilience), kJ/m3 280
36
Stiffness to Weight: Axial, points 15
7.4
Stiffness to Weight: Bending, points 69
23
Strength to Weight: Axial, points 38
4.1
Strength to Weight: Bending, points 49
7.1
Thermal Diffusivity, mm2/s 42
44
Thermal Shock Resistance, points 14
3.0

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.010
Cadmium (Cd), % 0
0 to 0.010
Copper (Cu), % 0 to 0.1
0 to 0.080
Iron (Fe), % 0
0 to 0.020
Lead (Pb), % 0
0 to 0.030
Magnesium (Mg), % 88.2 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
Tin (Sn), % 0
0 to 0.0030
Titanium (Ti), % 0
0 to 0.020
Zinc (Zn), % 0.35 to 1.0
99.827 to 100