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AZ91B Magnesium vs. AISI 409Cb Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while AISI 409Cb stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 AISI 409Cb stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
24
Fatigue Strength, MPa 79
140
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
75
Shear Strength, MPa 140
270
Tensile Strength: Ultimate (UTS), MPa 240
420
Tensile Strength: Yield (Proof), MPa 160
200

Thermal Properties

Latent Heat of Fusion, J/g 360
270
Maximum Temperature: Mechanical, °C 130
710
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 470
1410
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
25
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 58
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
8.5
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
2.2
Embodied Energy, MJ/kg 160
31
Embodied Water, L/kg 990
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
83
Resilience: Unit (Modulus of Resilience), kJ/m3 280
100
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
15
Strength to Weight: Bending, points 49
16
Thermal Diffusivity, mm2/s 42
6.7
Thermal Shock Resistance, points 14
15

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.060
Chromium (Cr), % 0
10.5 to 11.7
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
84.9 to 89.5
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 1.0
Nickel (Ni), % 0 to 0.030
0 to 0.5
Niobium (Nb), % 0
0 to 0.75
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0.35 to 1.0
0