ASTM B685 Alloy vs. EQ21A Magnesium
ASTM B685 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 B685 alloy and the bottom bar is EQ21A magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 120 | |
44 |
Poisson's Ratio | 0.37 | |
0.29 |
Shear Modulus, GPa | 43 | |
17 |
Tensile Strength: Ultimate (UTS), MPa | 660 to 1060 | |
250 |
Thermal Properties
Latent Heat of Fusion, J/g | 180 | |
340 |
Melting Completion (Liquidus), °C | 1230 | |
640 |
Melting Onset (Solidus), °C | 1200 | |
560 |
Specific Heat Capacity, J/kg-K | 300 | |
980 |
Thermal Expansion, µm/m-K | 14 | |
27 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 5.0 | |
25 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 4.1 | |
120 |
Otherwise Unclassified Properties
Density, g/cm3 | 11 | |
1.9 |
Common Calculations
Stiffness to Weight: Axial, points | 6.1 | |
13 |
Stiffness to Weight: Bending, points | 15 | |
63 |
Strength to Weight: Axial, points | 17 to 27 | |
37 |
Strength to Weight: Bending, points | 16 to 21 | |
47 |
Thermal Shock Resistance, points | 28 to 46 | |
15 |
Alloy Composition
Aluminum (Al), % | 0 to 0.0050 | |
0 |
Cadmium (Cd), % | 0 to 0.050 | |
0 |
Copper (Cu), % | 39.5 to 40.5 | |
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 | |
0 to 0.010 |
Palladium (Pd), % | 59 to 60.5 | |
0 |
Silver (Ag), % | 0 to 0.1 | |
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 |