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AZ91D Magnesium vs. SAE-AISI 9310 Steel

AZ91D magnesium belongs to the magnesium alloys classification, while SAE-AISI 9310 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, 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 AZ91D magnesium and the bottom bar is SAE-AISI 9310 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
540 to 610
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 2.3 to 4.5
17 to 19
Fatigue Strength, MPa 74 to 85
300 to 390
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 120 to 140
510 to 570
Tensile Strength: Ultimate (UTS), MPa 160 to 220
820 to 910
Tensile Strength: Yield (Proof), MPa 80 to 130
450 to 570

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 130
440
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 490
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 78
48
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 58
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
4.4
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
1.8
Embodied Energy, MJ/kg 160
24
Embodied Water, L/kg 990
57

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
120 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
540 to 860
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 26 to 34
29 to 32
Strength to Weight: Bending, points 38 to 46
25 to 27
Thermal Diffusivity, mm2/s 45
13
Thermal Shock Resistance, points 9.5 to 13
24 to 27

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.080 to 0.13
Chromium (Cr), % 0
1.0 to 1.4
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
93.8 to 95.2
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0.45 to 0.65
Molybdenum (Mo), % 0
0.080 to 0.15
Nickel (Ni), % 0 to 0.0020
3.0 to 3.5
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.1
0.2 to 0.35
Sulfur (S), % 0
0 to 0.012
Zinc (Zn), % 0.35 to 1.0
0