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ASTM B522 Class II vs. AZ91C Magnesium

ASTM B522 class II belongs to the otherwise unclassified metals classification, while AZ91C magnesium belongs to the magnesium alloys. There are 22 material properties with values for both materials. Properties with values for just one material (10, 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 ASTM B522 class II and the bottom bar is AZ91C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 96
46
Elongation at Break, % 1.1 to 28
2.3 to 7.9
Poisson's Ratio 0.41
0.29
Shear Modulus, GPa 34
18
Shear Strength, MPa 180 to 280
96 to 160
Tensile Strength: Ultimate (UTS), MPa 280 to 490
170 to 270
Tensile Strength: Yield (Proof), MPa 120 to 210
83 to 130

Thermal Properties

Latent Heat of Fusion, J/g 77
350
Melting Completion (Liquidus), °C 1030
600
Melting Onset (Solidus), °C 1030
470
Specific Heat Capacity, J/kg-K 160
990
Thermal Expansion, µm/m-K 15
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
9.9 to 12
Electrical Conductivity: Equal Weight (Specific), % IACS 5.7
52 to 60

Otherwise Unclassified Properties

Density, g/cm3 17
1.7

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.4 to 63
3.2 to 16
Resilience: Unit (Modulus of Resilience), kJ/m3 75 to 230
75 to 180
Stiffness to Weight: Axial, points 3.1
15
Stiffness to Weight: Bending, points 8.9
69
Strength to Weight: Axial, points 4.4 to 7.8
27 to 43
Strength to Weight: Bending, points 5.5 to 8.0
39 to 53
Thermal Shock Resistance, points 13 to 24
9.9 to 16

Alloy Composition

Aluminum (Al), % 0
8.1 to 9.3
Copper (Cu), % 0
0 to 0.1
Gold (Au), % 68.5 to 69.5
0
Magnesium (Mg), % 0
88.6 to 91.4
Manganese (Mn), % 0
0.13 to 0.35
Nickel (Ni), % 0
0 to 0.010
Platinum (Pt), % 5.5 to 6.5
0
Silicon (Si), % 0
0 to 0.3
Silver (Ag), % 24.5 to 25.5
0
Sulfur (S), % 0 to 0.010
0
Zinc (Zn), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3