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AZ91A Magnesium vs. AISI 440C Stainless Steel

AZ91A magnesium belongs to the magnesium alloys classification, while AISI 440C stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, 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 AZ91A magnesium and the bottom bar is AISI 440C stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
2.0 to 14
Fatigue Strength, MPa 99
260 to 840
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
76
Shear Strength, MPa 140
430 to 1120
Tensile Strength: Ultimate (UTS), MPa 240
710 to 1970
Tensile Strength: Yield (Proof), MPa 160
450 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 360
280
Maximum Temperature: Mechanical, °C 130
870
Melting Completion (Liquidus), °C 600
1480
Melting Onset (Solidus), °C 470
1370
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
22
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 52
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.0
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
2.2
Embodied Energy, MJ/kg 160
31
Embodied Water, L/kg 990
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
39 to 88
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
26 to 71
Strength to Weight: Bending, points 49
23 to 46
Thermal Diffusivity, mm2/s 42
6.0
Thermal Shock Resistance, points 14
26 to 71

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
1.0 to 1.2
Chromium (Cr), % 0
16 to 18
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
78 to 83.1
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.75
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0.35 to 1.0
0