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AZ91A Magnesium vs. 5251 Aluminum

AZ91A magnesium belongs to the magnesium alloys classification, while 5251 aluminum belongs to the aluminum alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is AZ91A magnesium and the bottom bar is 5251 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
44 to 79
Elastic (Young's, Tensile) Modulus, GPa 46
68
Elongation at Break, % 5.0
2.0 to 19
Fatigue Strength, MPa 99
59 to 110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
26
Shear Strength, MPa 140
110 to 160
Tensile Strength: Ultimate (UTS), MPa 240
180 to 280
Tensile Strength: Yield (Proof), MPa 160
67 to 250

Thermal Properties

Latent Heat of Fusion, J/g 360
400
Maximum Temperature: Mechanical, °C 130
180
Melting Completion (Liquidus), °C 600
650
Melting Onset (Solidus), °C 470
610
Specific Heat Capacity, J/kg-K 990
900
Thermal Conductivity, W/m-K 73
150
Thermal Expansion, µm/m-K 26
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
37
Electrical Conductivity: Equal Weight (Specific), % IACS 52
120

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.7
Embodied Carbon, kg CO2/kg material 22
8.5
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
5.4 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 280
33 to 450
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
50
Strength to Weight: Axial, points 38
18 to 29
Strength to Weight: Bending, points 49
26 to 35
Thermal Diffusivity, mm2/s 42
61
Thermal Shock Resistance, points 14
7.9 to 13

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
95.5 to 98.2
Chromium (Cr), % 0
0 to 0.15
Copper (Cu), % 0 to 0.1
0 to 0.15
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 88.2 to 91.2
1.7 to 2.4
Manganese (Mn), % 0.13 to 0.5
0.1 to 0.5
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.4
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0.35 to 1.0
0 to 0.15
Residuals, % 0
0 to 0.15