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AZ91A Magnesium vs. AISI 205 Stainless Steel

AZ91A magnesium belongs to the magnesium alloys classification, while AISI 205 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 205 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
210 to 440
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
11 to 51
Fatigue Strength, MPa 99
410 to 640
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Shear Strength, MPa 140
560 to 850
Tensile Strength: Ultimate (UTS), MPa 240
800 to 1430
Tensile Strength: Yield (Proof), MPa 160
450 to 1100

Thermal Properties

Latent Heat of Fusion, J/g 360
280
Maximum Temperature: Mechanical, °C 130
880
Melting Completion (Liquidus), °C 600
1380
Melting Onset (Solidus), °C 470
1340
Specific Heat Capacity, J/kg-K 990
480
Thermal Expansion, µm/m-K 26
18

Otherwise Unclassified Properties

Base Metal Price, % relative 12
11
Density, g/cm3 1.7
7.6
Embodied Carbon, kg CO2/kg material 22
2.6
Embodied Energy, MJ/kg 160
37
Embodied Water, L/kg 990
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
150 to 430
Resilience: Unit (Modulus of Resilience), kJ/m3 280
510 to 3060
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
26
Strength to Weight: Axial, points 38
29 to 52
Strength to Weight: Bending, points 49
25 to 37
Thermal Shock Resistance, points 14
16 to 29

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.12 to 0.25
Chromium (Cr), % 0
16.5 to 18.5
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
62.6 to 68.1
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
14 to 15.5
Nickel (Ni), % 0 to 0.030
1.0 to 1.7
Nitrogen (N), % 0
0.32 to 0.4
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0