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AZ91B Magnesium vs. ASTM A369 Grade FP12

AZ91B magnesium belongs to the magnesium alloys classification, while ASTM A369 grade FP12 belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 AZ91B magnesium and the bottom bar is ASTM A369 grade FP12.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
140
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
20
Fatigue Strength, MPa 79
170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 140
300
Tensile Strength: Ultimate (UTS), MPa 240
470
Tensile Strength: Yield (Proof), MPa 160
250

Thermal Properties

Latent Heat of Fusion, J/g 360
250
Maximum Temperature: Mechanical, °C 130
430
Melting Completion (Liquidus), °C 600
1470
Melting Onset (Solidus), °C 470
1430
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
45
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 58
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.8
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
1.6
Embodied Energy, MJ/kg 160
21
Embodied Water, L/kg 990
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
81
Resilience: Unit (Modulus of Resilience), kJ/m3 280
160
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
17
Strength to Weight: Bending, points 49
17
Thermal Diffusivity, mm2/s 42
12
Thermal Shock Resistance, points 14
14

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0
0.8 to 1.3
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
96.8 to 98.4
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.3 to 0.61
Molybdenum (Mo), % 0
0.44 to 0.65
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0
0 to 0.025
Zinc (Zn), % 0.35 to 1.0
0