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7050 Aluminum vs. AZ31C Magnesium

7050 aluminum belongs to the aluminum alloys classification, while AZ31C magnesium belongs to the magnesium alloys.

For each property being compared, the top bar is 7050 aluminum and the bottom bar is AZ31C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
45
Elongation at Break, % 2.2 to 12
12
Fatigue Strength, MPa 130 to 210
150
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 280 to 330
130
Tensile Strength: Ultimate (UTS), MPa 490 to 570
260
Tensile Strength: Yield (Proof), MPa 390 to 500
200

Thermal Properties

Latent Heat of Fusion, J/g 370
350
Maximum Temperature: Mechanical, °C 190
110
Melting Completion (Liquidus), °C 630
600
Melting Onset (Solidus), °C 490
550
Specific Heat Capacity, J/kg-K 860
990
Thermal Conductivity, W/m-K 140
130
Thermal Expansion, µm/m-K 24
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
19
Electrical Conductivity: Equal Weight (Specific), % IACS 100
98

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 3.1
1.7
Embodied Carbon, kg CO2/kg material 8.2
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1120
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 10 to 55
28
Resilience: Unit (Modulus of Resilience), kJ/m3 1110 to 1760
440
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 45
70
Strength to Weight: Axial, points 45 to 51
42
Strength to Weight: Bending, points 45 to 50
53
Thermal Diffusivity, mm2/s 54
74
Thermal Shock Resistance, points 21 to 25
16

Alloy Composition

Aluminum (Al), % 87.3 to 92.1
2.4 to 3.6
Chromium (Cr), % 0 to 0.040
0
Copper (Cu), % 2.0 to 2.6
0 to 0.1
Iron (Fe), % 0 to 0.15
0
Magnesium (Mg), % 1.9 to 2.6
93.4 to 97
Manganese (Mn), % 0 to 0.1
0.15 to 1.0
Nickel (Ni), % 0
0 to 0.030
Silicon (Si), % 0 to 0.12
0 to 0.1
Titanium (Ti), % 0 to 0.060
0
Zinc (Zn), % 5.7 to 6.7
0.5 to 1.5
Zirconium (Zr), % 0.080 to 0.15
0
Residuals, % 0
0 to 0.3