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AZ91B Magnesium vs. ASTM A369 Grade FP5

AZ91B magnesium belongs to the magnesium alloys classification, while ASTM A369 grade FP5 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 FP5.

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
160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
74
Shear Strength, MPa 140
300
Tensile Strength: Ultimate (UTS), MPa 240
470
Tensile Strength: Yield (Proof), MPa 160
240

Thermal Properties

Latent Heat of Fusion, J/g 360
260
Maximum Temperature: Mechanical, °C 130
510
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 470
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
40
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 58
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 12
4.3
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
1.7
Embodied Energy, MJ/kg 160
23
Embodied Water, L/kg 990
69

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
80
Resilience: Unit (Modulus of Resilience), kJ/m3 280
140
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
17
Strength to Weight: Bending, points 49
17
Thermal Diffusivity, mm2/s 42
11
Thermal Shock Resistance, points 14
13

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
4.0 to 6.0
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
92.1 to 95.3
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.3 to 0.6
Molybdenum (Mo), % 0
0.45 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