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AZ91D Magnesium vs. EN AC-51400 Aluminum

AZ91D magnesium belongs to the magnesium alloys classification, while EN AC-51400 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is AZ91D magnesium and the bottom bar is EN AC-51400 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
71
Elastic (Young's, Tensile) Modulus, GPa 46
67
Elongation at Break, % 2.3 to 4.5
3.4
Fatigue Strength, MPa 74 to 85
85
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
25
Tensile Strength: Ultimate (UTS), MPa 160 to 220
190
Tensile Strength: Yield (Proof), MPa 80 to 130
120

Thermal Properties

Latent Heat of Fusion, J/g 350
400
Maximum Temperature: Mechanical, °C 130
170
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 490
600
Specific Heat Capacity, J/kg-K 990
910
Thermal Conductivity, W/m-K 78
110
Thermal Expansion, µm/m-K 27
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
31
Electrical Conductivity: Equal Weight (Specific), % IACS 58
110

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.7
Embodied Carbon, kg CO2/kg material 22
9.1
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
5.6
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
110
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
51
Strength to Weight: Axial, points 26 to 34
20
Strength to Weight: Bending, points 38 to 46
28
Thermal Diffusivity, mm2/s 45
46
Thermal Shock Resistance, points 9.5 to 13
8.6

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
90.5 to 95.5
Copper (Cu), % 0 to 0.030
0 to 0.050
Iron (Fe), % 0 to 0.0050
0 to 0.55
Magnesium (Mg), % 88.7 to 91.2
4.5 to 6.5
Manganese (Mn), % 0.15 to 0.5
0 to 0.45
Nickel (Ni), % 0 to 0.0020
0
Silicon (Si), % 0 to 0.1
0 to 1.5
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0.35 to 1.0
0 to 0.1
Residuals, % 0
0 to 0.15