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6351-T6 Aluminum vs. AZ91E-T6 Magnesium

6351-T6 aluminum belongs to the aluminum alloys classification, while AZ91E-T6 magnesium belongs to the magnesium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is 6351-T6 aluminum and the bottom bar is AZ91E-T6 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95
75
Elastic (Young's, Tensile) Modulus, GPa 69
46
Elongation at Break, % 11
3.9
Fatigue Strength, MPa 90
84
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
18
Shear Strength, MPa 200
150
Tensile Strength: Ultimate (UTS), MPa 310
260
Tensile Strength: Yield (Proof), MPa 270
130

Thermal Properties

Latent Heat of Fusion, J/g 410
350
Maximum Temperature: Mechanical, °C 160
130
Melting Completion (Liquidus), °C 650
600
Melting Onset (Solidus), °C 570
500
Specific Heat Capacity, J/kg-K 900
990
Thermal Conductivity, W/m-K 180
84
Thermal Expansion, µm/m-K 23
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 46
11
Electrical Conductivity: Equal Weight (Specific), % IACS 150
58

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
12
Density, g/cm3 2.7
1.7
Embodied Carbon, kg CO2/kg material 8.3
22
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1180
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 33
8.6
Resilience: Unit (Modulus of Resilience), kJ/m3 540
190
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
69
Strength to Weight: Axial, points 32
42
Strength to Weight: Bending, points 38
53
Thermal Diffusivity, mm2/s 72
49
Thermal Shock Resistance, points 14
15

Alloy Composition

Aluminum (Al), % 96 to 98.5
8.1 to 9.3
Copper (Cu), % 0 to 0.1
0 to 0.015
Iron (Fe), % 0 to 0.5
0 to 0.0050
Magnesium (Mg), % 0.4 to 0.8
88.8 to 91.3
Manganese (Mn), % 0.4 to 0.8
0.17 to 0.35
Nickel (Ni), % 0
0 to 0.0010
Silicon (Si), % 0.7 to 1.3
0 to 0.2
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 0.2
0.4 to 1.0
Residuals, % 0
0 to 0.3