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AZ81A Magnesium vs. Low-oxygen Zirconium

AZ81A magnesium belongs to the magnesium alloys classification, while low-oxygen zirconium belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (13, 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 AZ81A magnesium and the bottom bar is low-oxygen zirconium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
98
Elongation at Break, % 3.0 to 8.8
23
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
37
Tensile Strength: Ultimate (UTS), MPa 160 to 240
330
Tensile Strength: Yield (Proof), MPa 84
270

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Specific Heat Capacity, J/kg-K 990
270
Thermal Conductivity, W/m-K 84
22
Thermal Expansion, µm/m-K 27
5.7

Otherwise Unclassified Properties

Density, g/cm3 1.7
6.7
Embodied Water, L/kg 990
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
70
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
370
Stiffness to Weight: Axial, points 15
8.1
Stiffness to Weight: Bending, points 70
23
Strength to Weight: Axial, points 26 to 39
14
Strength to Weight: Bending, points 38 to 50
16
Thermal Diffusivity, mm2/s 50
12
Thermal Shock Resistance, points 9.1 to 14
42

Alloy Composition


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Aluminum (Al), % 7.0 to 8.1
0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
0 to 0.2
Copper (Cu), % 0 to 0.1
0
Hafnium (Hf), % 0
0 to 4.5
Hydrogen (H), % 0
0 to 0.0050
Iron (Fe), % 0
0 to 0.2
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0
Nickel (Ni), % 0 to 0.010
0
Nitrogen (N), % 0
0 to 0.025
Oxygen (O), % 0
0 to 0.1
Silicon (Si), % 0 to 0.3
0
Zinc (Zn), % 0.4 to 1.0
0
Zirconium (Zr), % 0
94.7 to 100
Residuals, % 0 to 0.3
0