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ASTM B780 Alloy vs. EQ21A Magnesium

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while EQ21A magnesium belongs to the magnesium alloys. 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 ASTM B780 alloy and the bottom bar is EQ21A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 83
44
Elongation at Break, % 1.1 to 9.1
2.4
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 30
17
Shear Strength, MPa 200 to 340
150
Tensile Strength: Ultimate (UTS), MPa 330 to 590
250

Thermal Properties

Latent Heat of Fusion, J/g 140
340
Specific Heat Capacity, J/kg-K 270
980
Thermal Expansion, µm/m-K 18
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 70 to 76
25
Electrical Conductivity: Equal Weight (Specific), % IACS 62 to 68
120

Otherwise Unclassified Properties

Density, g/cm3 10
1.9

Common Calculations

Stiffness to Weight: Axial, points 4.5
13
Stiffness to Weight: Bending, points 14
63
Strength to Weight: Axial, points 9.1 to 16
37
Strength to Weight: Bending, points 11 to 15
47
Thermal Shock Resistance, points 16 to 29
15

Alloy Composition

Cadmium (Cd), % 0 to 0.050
0
Copper (Cu), % 23.5 to 25.7
0.050 to 0.1
Iron (Fe), % 0 to 0.050
0
Lead (Pb), % 0 to 0.030
0
Magnesium (Mg), % 0
93.9 to 96.8
Nickel (Ni), % 0.35 to 0.65
0 to 0.010
Silver (Ag), % 74 to 76
1.3 to 1.7
Unspecified Rare Earths, % 0
1.5 to 3.0
Zinc (Zn), % 0 to 0.060
0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3