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AZ61A Magnesium vs. AISI 309Cb Stainless Steel

AZ61A magnesium belongs to the magnesium alloys classification, while AISI 309Cb stainless steel belongs to the iron alloys. There are 30 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 AZ61A magnesium and the bottom bar is AISI 309Cb stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 11
39
Fatigue Strength, MPa 130
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
78
Shear Strength, MPa 150
390
Tensile Strength: Ultimate (UTS), MPa 280
580
Tensile Strength: Yield (Proof), MPa 170
230

Thermal Properties

Latent Heat of Fusion, J/g 350
300
Maximum Temperature: Mechanical, °C 120
1090
Melting Completion (Liquidus), °C 600
1420
Melting Onset (Solidus), °C 530
1380
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 79
15
Thermal Expansion, µm/m-K 27
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 62
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
23
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 23
4.1
Embodied Energy, MJ/kg 160
59
Embodied Water, L/kg 980
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
180
Resilience: Unit (Modulus of Resilience), kJ/m3 310
140
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 46
20
Strength to Weight: Bending, points 56
20
Thermal Diffusivity, mm2/s 47
4.0
Thermal Shock Resistance, points 17
13

Alloy Composition


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Aluminum (Al), % 5.5 to 7.2
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
22 to 24
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
56 to 66
Magnesium (Mg), % 90.3 to 93.9
0
Manganese (Mn), % 0.15 to 0.5
0 to 2.0
Nickel (Ni), % 0 to 0.0050
12 to 16
Niobium (Nb), % 0
0 to 1.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.1
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.4 to 1.5
0
Residuals, % 0 to 0.3
0