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AZ91A Magnesium vs. 4045 Aluminum

AZ91A magnesium belongs to the magnesium alloys classification, while 4045 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 4045 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
71
Elongation at Break, % 5.0
2.3
Fatigue Strength, MPa 99
45
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
27
Shear Strength, MPa 140
69
Tensile Strength: Ultimate (UTS), MPa 240
120
Tensile Strength: Yield (Proof), MPa 160
64

Thermal Properties

Latent Heat of Fusion, J/g 360
540
Maximum Temperature: Mechanical, °C 130
160
Melting Completion (Liquidus), °C 600
600
Melting Onset (Solidus), °C 470
580
Specific Heat Capacity, J/kg-K 990
900
Thermal Conductivity, W/m-K 73
170
Thermal Expansion, µm/m-K 26
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
45
Electrical Conductivity: Equal Weight (Specific), % IACS 52
160

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.6
Embodied Carbon, kg CO2/kg material 22
7.8
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1070

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
2.4
Resilience: Unit (Modulus of Resilience), kJ/m3 280
29
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 69
54
Strength to Weight: Axial, points 38
13
Strength to Weight: Bending, points 49
21
Thermal Diffusivity, mm2/s 42
74
Thermal Shock Resistance, points 14
5.7

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
87.4 to 91
Copper (Cu), % 0 to 0.1
0 to 0.3
Iron (Fe), % 0
0 to 0.8
Magnesium (Mg), % 88.2 to 91.2
0 to 0.050
Manganese (Mn), % 0.13 to 0.5
0 to 0.050
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
9.0 to 11
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0.35 to 1.0
0 to 0.1
Residuals, % 0
0 to 0.15