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7049A Aluminum vs. AZ31C Magnesium

7049A aluminum belongs to the aluminum alloys classification, while AZ31C magnesium belongs to the magnesium alloys.

For each property being compared, the top bar is 7049A aluminum and the bottom bar is AZ31C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
45
Elongation at Break, % 5.0 to 5.7
12
Fatigue Strength, MPa 180
150
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
17
Shear Strength, MPa 340 to 350
130
Tensile Strength: Ultimate (UTS), MPa 580 to 590
260
Tensile Strength: Yield (Proof), MPa 500 to 530
200

Thermal Properties

Latent Heat of Fusion, J/g 370
350
Maximum Temperature: Mechanical, °C 200
110
Melting Completion (Liquidus), °C 640
600
Melting Onset (Solidus), °C 430
550
Specific Heat Capacity, J/kg-K 850
990
Thermal Conductivity, W/m-K 130
130
Thermal Expansion, µm/m-K 24
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
19
Electrical Conductivity: Equal Weight (Specific), % IACS 120
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 1100
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 28 to 32
28
Resilience: Unit (Modulus of Resilience), kJ/m3 1800 to 1990
440
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 44
70
Strength to Weight: Axial, points 52 to 53
42
Strength to Weight: Bending, points 50 to 51
53
Thermal Diffusivity, mm2/s 50
74
Thermal Shock Resistance, points 25
16

Alloy Composition

Aluminum (Al), % 84.6 to 89.5
2.4 to 3.6
Chromium (Cr), % 0.050 to 0.25
0
Copper (Cu), % 1.2 to 1.9
0 to 0.1
Iron (Fe), % 0 to 0.5
0
Magnesium (Mg), % 2.1 to 3.1
93.4 to 97
Manganese (Mn), % 0 to 0.5
0.15 to 1.0
Nickel (Ni), % 0
0 to 0.030
Silicon (Si), % 0 to 0.4
0 to 0.1
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 7.2 to 8.4
0.5 to 1.5
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0
0 to 0.3