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AZ91A Magnesium vs. 5056 Aluminum

AZ91A magnesium belongs to the magnesium alloys classification, while 5056 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 AZ91A magnesium and the bottom bar is 5056 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
67
Elongation at Break, % 5.0
4.9 to 31
Fatigue Strength, MPa 99
140 to 200
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
25
Shear Strength, MPa 140
170 to 240
Tensile Strength: Ultimate (UTS), MPa 240
290 to 460
Tensile Strength: Yield (Proof), MPa 160
150 to 410

Thermal Properties

Latent Heat of Fusion, J/g 360
400
Maximum Temperature: Mechanical, °C 130
190
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 470
570
Specific Heat Capacity, J/kg-K 990
910
Thermal Conductivity, W/m-K 73
130
Thermal Expansion, µm/m-K 26
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
29
Electrical Conductivity: Equal Weight (Specific), % IACS 52
99

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.7
Embodied Carbon, kg CO2/kg material 22
9.0
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
12 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 280
170 to 1220
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
51
Strength to Weight: Axial, points 38
30 to 48
Strength to Weight: Bending, points 49
36 to 50
Thermal Diffusivity, mm2/s 42
53
Thermal Shock Resistance, points 14
13 to 20

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
93 to 95.4
Chromium (Cr), % 0
0.050 to 0.2
Copper (Cu), % 0 to 0.1
0 to 0.1
Iron (Fe), % 0
0 to 0.4
Magnesium (Mg), % 88.2 to 91.2
4.5 to 5.6
Manganese (Mn), % 0.13 to 0.5
0.050 to 0.2
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.3
Zinc (Zn), % 0.35 to 1.0
0 to 0.1
Residuals, % 0
0 to 0.15