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AZ91A Magnesium vs. EN AC-21200 Aluminum

AZ91A magnesium belongs to the magnesium alloys classification, while EN AC-21200 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AZ91A magnesium and the bottom bar is EN AC-21200 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
120 to 130
Elastic (Young's, Tensile) Modulus, GPa 46
71
Elongation at Break, % 5.0
3.9 to 6.2
Fatigue Strength, MPa 99
110 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
27
Tensile Strength: Ultimate (UTS), MPa 240
410 to 440
Tensile Strength: Yield (Proof), MPa 160
270 to 360

Thermal Properties

Latent Heat of Fusion, J/g 360
390
Maximum Temperature: Mechanical, °C 130
170
Melting Completion (Liquidus), °C 600
660
Melting Onset (Solidus), °C 470
550
Specific Heat Capacity, J/kg-K 990
880
Thermal Conductivity, W/m-K 73
130
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
34
Electrical Conductivity: Equal Weight (Specific), % IACS 52
100

Otherwise Unclassified Properties

Base Metal Price, % relative 12
10
Density, g/cm3 1.7
3.0
Embodied Carbon, kg CO2/kg material 22
8.0
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
16 to 22
Resilience: Unit (Modulus of Resilience), kJ/m3 280
500 to 930
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
46
Strength to Weight: Axial, points 38
38 to 40
Strength to Weight: Bending, points 49
41 to 43
Thermal Diffusivity, mm2/s 42
49
Thermal Shock Resistance, points 14
18 to 19

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
93.3 to 95.7
Copper (Cu), % 0 to 0.1
4.0 to 5.0
Iron (Fe), % 0
0 to 0.2
Lead (Pb), % 0
0 to 0.030
Magnesium (Mg), % 88.2 to 91.2
0.15 to 0.5
Manganese (Mn), % 0.13 to 0.5
0.2 to 0.5
Nickel (Ni), % 0 to 0.030
0 to 0.050
Silicon (Si), % 0 to 0.5
0 to 0.1
Tin (Sn), % 0
0 to 0.030
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0.35 to 1.0
0 to 0.1
Residuals, % 0
0 to 0.1