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AZ91B Magnesium vs. 2025 Aluminum

AZ91B magnesium belongs to the magnesium alloys classification, while 2025 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 AZ91B magnesium and the bottom bar is 2025 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
110
Elastic (Young's, Tensile) Modulus, GPa 46
72
Elongation at Break, % 5.0
15
Fatigue Strength, MPa 79
130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
27
Shear Strength, MPa 140
240
Tensile Strength: Ultimate (UTS), MPa 240
400
Tensile Strength: Yield (Proof), MPa 160
260

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
520
Specific Heat Capacity, J/kg-K 990
870
Thermal Conductivity, W/m-K 73
150
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
40
Electrical Conductivity: Equal Weight (Specific), % IACS 58
120

Otherwise Unclassified Properties

Base Metal Price, % relative 12
10
Density, g/cm3 1.7
3.0
Embodied Carbon, kg CO2/kg material 22
7.9
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
55
Resilience: Unit (Modulus of Resilience), kJ/m3 280
450
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
46
Strength to Weight: Axial, points 38
37
Strength to Weight: Bending, points 49
40
Thermal Diffusivity, mm2/s 42
58
Thermal Shock Resistance, points 14
18

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
90.9 to 95.2
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0 to 0.35
3.9 to 5.0
Iron (Fe), % 0
0 to 1.0
Magnesium (Mg), % 87.9 to 91.2
0 to 0.050
Manganese (Mn), % 0.13 to 0.5
0.4 to 1.2
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0.5 to 1.2
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0.35 to 1.0
0 to 0.25
Residuals, % 0
0 to 0.15