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6151 Aluminum vs. AZ31C Magnesium

6151 aluminum belongs to the aluminum alloys classification, while AZ31C magnesium belongs to the magnesium alloys.

For each property being compared, the top bar is 6151 aluminum and the bottom bar is AZ31C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
45
Elongation at Break, % 1.1 to 5.7
12
Fatigue Strength, MPa 80 to 100
150
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 190 to 200
130
Tensile Strength: Ultimate (UTS), MPa 330 to 340
260
Tensile Strength: Yield (Proof), MPa 270 to 280
200

Thermal Properties

Latent Heat of Fusion, J/g 410
350
Maximum Temperature: Mechanical, °C 170
110
Melting Completion (Liquidus), °C 650
600
Melting Onset (Solidus), °C 590
550
Specific Heat Capacity, J/kg-K 900
990
Thermal Conductivity, W/m-K 170
130
Thermal Expansion, µm/m-K 23
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 45
19
Electrical Conductivity: Equal Weight (Specific), % IACS 150
98

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
12
Density, g/cm3 2.7
1.7
Embodied Carbon, kg CO2/kg material 8.2
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1180
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.5 to 18
28
Resilience: Unit (Modulus of Resilience), kJ/m3 520 to 580
440
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
70
Strength to Weight: Axial, points 34
42
Strength to Weight: Bending, points 39
53
Thermal Diffusivity, mm2/s 70
74
Thermal Shock Resistance, points 15
16

Alloy Composition

Aluminum (Al), % 95.6 to 98.8
2.4 to 3.6
Chromium (Cr), % 0.15 to 0.35
0
Copper (Cu), % 0 to 0.35
0 to 0.1
Iron (Fe), % 0 to 1.0
0
Magnesium (Mg), % 0.45 to 0.8
93.4 to 97
Manganese (Mn), % 0 to 0.2
0.15 to 1.0
Nickel (Ni), % 0
0 to 0.030
Silicon (Si), % 0.6 to 1.2
0 to 0.1
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0.5 to 1.5
Residuals, % 0
0 to 0.3