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AZ91A Magnesium vs. AISI 314 Stainless Steel

AZ91A magnesium belongs to the magnesium alloys classification, while AISI 314 stainless steel belongs to the iron alloys. There are 31 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 AZ91A magnesium and the bottom bar is AISI 314 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
180
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
45
Fatigue Strength, MPa 99
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
78
Shear Strength, MPa 140
410
Tensile Strength: Ultimate (UTS), MPa 240
590
Tensile Strength: Yield (Proof), MPa 160
230

Thermal Properties

Latent Heat of Fusion, J/g 360
330
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1380
Melting Onset (Solidus), °C 470
1340
Specific Heat Capacity, J/kg-K 990
490
Thermal Conductivity, W/m-K 73
15
Thermal Expansion, µm/m-K 26
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 52
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
25
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
4.3
Embodied Energy, MJ/kg 160
62
Embodied Water, L/kg 990
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
210
Resilience: Unit (Modulus of Resilience), kJ/m3 280
130
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
21
Strength to Weight: Bending, points 49
20
Thermal Diffusivity, mm2/s 42
3.9
Thermal Shock Resistance, points 14
14

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.25
Chromium (Cr), % 0
23 to 26
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
46.7 to 56.5
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 2.0
Nickel (Ni), % 0 to 0.030
19 to 22
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.5
1.5 to 3.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0