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AZ91A Magnesium vs. EN 1.7711 Steel

AZ91A magnesium belongs to the magnesium alloys classification, while EN 1.7711 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 1.7711 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
210 to 280
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
16 to 22
Fatigue Strength, MPa 99
290 to 520
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 140
440 to 570
Tensile Strength: Ultimate (UTS), MPa 240
690 to 930
Tensile Strength: Yield (Proof), MPa 160
400 to 800

Thermal Properties

Latent Heat of Fusion, J/g 360
250
Maximum Temperature: Mechanical, °C 130
430
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 470
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
33
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 52
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
3.0
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
2.3
Embodied Energy, MJ/kg 160
32
Embodied Water, L/kg 990
54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
130 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 280
430 to 1690
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
24 to 33
Strength to Weight: Bending, points 49
22 to 27
Thermal Diffusivity, mm2/s 42
8.9
Thermal Shock Resistance, points 14
24 to 32

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.015
Carbon (C), % 0
0.36 to 0.44
Chromium (Cr), % 0
0.9 to 1.2
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
96 to 97.5
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.45 to 0.85
Molybdenum (Mo), % 0
0.5 to 0.65
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.25 to 0.35
Zinc (Zn), % 0.35 to 1.0
0