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AZ91A Magnesium vs. EN 1.4905 Stainless Steel

AZ91A magnesium belongs to the magnesium alloys classification, while EN 1.4905 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 AZ91A magnesium and the bottom bar is EN 1.4905 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
19
Fatigue Strength, MPa 99
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
76
Shear Strength, MPa 140
460
Tensile Strength: Ultimate (UTS), MPa 240
740
Tensile Strength: Yield (Proof), MPa 160
510

Thermal Properties

Latent Heat of Fusion, J/g 360
270
Maximum Temperature: Mechanical, °C 130
660
Melting Completion (Liquidus), °C 600
1480
Melting Onset (Solidus), °C 470
1440
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
26
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
3.7
Electrical Conductivity: Equal Weight (Specific), % IACS 52
4.2

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
2.8
Embodied Energy, MJ/kg 160
40
Embodied Water, L/kg 990
90

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
130
Resilience: Unit (Modulus of Resilience), kJ/m3 280
680
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
26
Strength to Weight: Bending, points 49
23
Thermal Diffusivity, mm2/s 42
7.0
Thermal Shock Resistance, points 14
25

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.040
Boron (B), % 0
0.00050 to 0.0050
Carbon (C), % 0
0.090 to 0.13
Chromium (Cr), % 0
8.5 to 9.5
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
86.2 to 88.8
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 0 to 0.030
0.1 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.050 to 0.090
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.5
0.1 to 0.5
Sulfur (S), % 0
0 to 0.010
Tungsten (W), % 0
0.9 to 1.1
Vanadium (V), % 0
0.18 to 0.25
Zinc (Zn), % 0.35 to 1.0
0