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EQ21A Magnesium vs. Nuclear Grade Hafnium

EQ21A magnesium belongs to the magnesium alloys classification, while nuclear grade hafnium belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (16, 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 EQ21A magnesium and the bottom bar is nuclear grade hafnium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 44
78
Elongation at Break, % 2.4
25
Poisson's Ratio 0.29
0.26
Shear Modulus, GPa 17
31
Tensile Strength: Ultimate (UTS), MPa 250
350
Tensile Strength: Yield (Proof), MPa 190
170

Thermal Properties

Latent Heat of Fusion, J/g 340
130
Specific Heat Capacity, J/kg-K 980
140
Thermal Expansion, µm/m-K 27
5.9

Otherwise Unclassified Properties

Density, g/cm3 1.9
13

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.6
73
Resilience: Unit (Modulus of Resilience), kJ/m3 410
180
Stiffness to Weight: Axial, points 13
3.3
Stiffness to Weight: Bending, points 63
11
Strength to Weight: Axial, points 37
7.4
Strength to Weight: Bending, points 47
8.4
Thermal Shock Resistance, points 15
55

Alloy Composition

Copper (Cu), % 0.050 to 0.1
0
Hafnium (Hf), % 0
99.8 to 100
Magnesium (Mg), % 93.9 to 96.8
0
Nickel (Ni), % 0 to 0.010
0
Silver (Ag), % 1.3 to 1.7
0
Unspecified Rare Earths, % 1.5 to 3.0
0
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0 to 0.23