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AWS BMg-1 vs. SAE-AISI 8660 Steel

AWS BMg-1 belongs to the magnesium alloys classification, while SAE-AISI 8660 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 AWS BMg-1 and the bottom bar is SAE-AISI 8660 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 47
190
Elongation at Break, % 3.8
12
Fatigue Strength, MPa 72
340
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 100
390
Tensile Strength: Ultimate (UTS), MPa 180
660
Tensile Strength: Yield (Proof), MPa 110
550

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 130
410
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 440
1410
Specific Heat Capacity, J/kg-K 980
470
Thermal Conductivity, W/m-K 76
39
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 55
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.6
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 22
1.5
Embodied Energy, MJ/kg 160
20
Embodied Water, L/kg 980
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.9
73
Resilience: Unit (Modulus of Resilience), kJ/m3 120
800
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 66
24
Strength to Weight: Axial, points 27
23
Strength to Weight: Bending, points 39
21
Thermal Diffusivity, mm2/s 43
10
Thermal Shock Resistance, points 10
19

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Beryllium (Be), % 0.00020 to 0.00080
0
Carbon (C), % 0
0.56 to 0.64
Chromium (Cr), % 0
0.4 to 0.6
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
96.4 to 97.6
Magnesium (Mg), % 86.1 to 89.8
0
Manganese (Mn), % 0.15 to 1.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0 to 0.0050
0.4 to 0.7
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.050
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 1.7 to 2.3
0
Residuals, % 0 to 0.3
0