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AZ91B Magnesium vs. 238.0 Aluminum

AZ91B magnesium belongs to the magnesium alloys classification, while 238.0 aluminum belongs to the aluminum alloys. There are 29 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 AZ91B magnesium and the bottom bar is 238.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
76
Elongation at Break, % 5.0
1.5
Fatigue Strength, MPa 79
110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
28
Tensile Strength: Ultimate (UTS), MPa 240
210
Tensile Strength: Yield (Proof), MPa 160
170

Thermal Properties

Latent Heat of Fusion, J/g 360
430
Maximum Temperature: Mechanical, °C 130
170
Melting Completion (Liquidus), °C 600
600
Melting Onset (Solidus), °C 470
510
Specific Heat Capacity, J/kg-K 990
840
Thermal Conductivity, W/m-K 73
100
Thermal Expansion, µm/m-K 26
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
25
Electrical Conductivity: Equal Weight (Specific), % IACS 58
67

Otherwise Unclassified Properties

Base Metal Price, % relative 12
12
Density, g/cm3 1.7
3.4
Embodied Carbon, kg CO2/kg material 22
7.4
Embodied Energy, MJ/kg 160
140
Embodied Water, L/kg 990
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
2.9
Resilience: Unit (Modulus of Resilience), kJ/m3 280
180
Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 69
42
Strength to Weight: Axial, points 38
17
Strength to Weight: Bending, points 49
23
Thermal Diffusivity, mm2/s 42
37
Thermal Shock Resistance, points 14
9.1

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
81.9 to 84.9
Copper (Cu), % 0 to 0.35
9.5 to 10.5
Iron (Fe), % 0
1.0 to 1.5
Magnesium (Mg), % 87.9 to 91.2
0 to 0.25
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
3.6 to 4.4
Zinc (Zn), % 0.35 to 1.0
1.0 to 1.5