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AZ91B Magnesium vs. Grade 702C Zirconium

AZ91B magnesium belongs to the magnesium alloys classification, while grade 702C zirconium belongs to the otherwise unclassified metals. There are 21 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 AZ91B magnesium and the bottom bar is grade 702C zirconium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
180
Elastic (Young's, Tensile) Modulus, GPa 46
97
Elongation at Break, % 5.0
13
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
36
Tensile Strength: Ultimate (UTS), MPa 240
430
Tensile Strength: Yield (Proof), MPa 160
310

Thermal Properties

Latent Heat of Fusion, J/g 360
250
Specific Heat Capacity, J/kg-K 990
270
Thermal Conductivity, W/m-K 73
22
Thermal Expansion, µm/m-K 26
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 11
52
Resilience: Unit (Modulus of Resilience), kJ/m3 280
510
Stiffness to Weight: Axial, points 15
8.1
Stiffness to Weight: Bending, points 69
23
Strength to Weight: Axial, points 38
18
Strength to Weight: Bending, points 49
19
Thermal Diffusivity, mm2/s 42
12
Thermal Shock Resistance, points 14
55

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.1
Copper (Cu), % 0 to 0.35
0
Hafnium (Hf), % 0
0 to 4.5
Hydrogen (H), % 0
0 to 0.0050
Iron (Fe), % 0
0 to 0.3
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.25
Phosphorus (P), % 0
0 to 0.010
Silicon (Si), % 0 to 0.5
0
Zinc (Zn), % 0.35 to 1.0
0
Zirconium (Zr), % 0
94.8 to 100