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ASTM B685 Alloy vs. M1A Magnesium

ASTM B685 alloy belongs to the otherwise unclassified metals classification, while M1A magnesium belongs to the magnesium alloys. There are 17 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 ASTM B685 alloy and the bottom bar is M1A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
45
Poisson's Ratio 0.37
0.29
Shear Modulus, GPa 43
18
Tensile Strength: Ultimate (UTS), MPa 660 to 1060
230

Thermal Properties

Latent Heat of Fusion, J/g 180
350
Melting Completion (Liquidus), °C 1230
610
Melting Onset (Solidus), °C 1200
580
Specific Heat Capacity, J/kg-K 300
990
Thermal Expansion, µm/m-K 14
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 5.0
35
Electrical Conductivity: Equal Weight (Specific), % IACS 4.1
190

Otherwise Unclassified Properties

Density, g/cm3 11
1.7

Common Calculations

Stiffness to Weight: Axial, points 6.1
15
Stiffness to Weight: Bending, points 15
71
Strength to Weight: Axial, points 17 to 27
38
Strength to Weight: Bending, points 16 to 21
49
Thermal Shock Resistance, points 28 to 46
13

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0
Cadmium (Cd), % 0 to 0.050
0
Calcium (Ca), % 0
0 to 0.3
Copper (Cu), % 39.5 to 40.5
0 to 0.050
Iron (Fe), % 0 to 0.050
0
Lead (Pb), % 0 to 0.030
0
Magnesium (Mg), % 0
97.2 to 98.8
Manganese (Mn), % 0
1.2 to 2.0
Nickel (Ni), % 0
0 to 0.010
Palladium (Pd), % 59 to 60.5
0
Silicon (Si), % 0
0 to 0.1
Silver (Ag), % 0 to 0.1
0
Zinc (Zn), % 0 to 0.060
0
Residuals, % 0
0 to 0.3