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7049 Aluminum vs. EQ21A Magnesium

7049 aluminum belongs to the aluminum alloys classification, while EQ21A magnesium belongs to the magnesium alloys. There are 30 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 7049 aluminum and the bottom bar is EQ21A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
80
Elastic (Young's, Tensile) Modulus, GPa 70
44
Elongation at Break, % 6.2 to 7.0
2.4
Fatigue Strength, MPa 160 to 170
110
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
17
Shear Strength, MPa 300 to 310
150
Tensile Strength: Ultimate (UTS), MPa 510 to 530
250
Tensile Strength: Yield (Proof), MPa 420 to 450
190

Thermal Properties

Latent Heat of Fusion, J/g 370
340
Maximum Temperature: Mechanical, °C 180
160
Melting Completion (Liquidus), °C 640
640
Melting Onset (Solidus), °C 480
560
Specific Heat Capacity, J/kg-K 860
980
Thermal Conductivity, W/m-K 130
110
Thermal Expansion, µm/m-K 23
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
25
Electrical Conductivity: Equal Weight (Specific), % IACS 110
120

Otherwise Unclassified Properties

Base Metal Price, % relative 10
80
Density, g/cm3 3.1
1.9
Embodied Carbon, kg CO2/kg material 8.1
27
Embodied Energy, MJ/kg 140
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
5.6
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
410
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
63
Strength to Weight: Axial, points 46 to 47
37
Strength to Weight: Bending, points 46 to 47
47
Thermal Diffusivity, mm2/s 51
62
Thermal Shock Resistance, points 22 to 23
15

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Chromium (Cr), % 0.1 to 0.22
0
Copper (Cu), % 1.2 to 1.9
0.050 to 0.1
Iron (Fe), % 0 to 0.35
0
Magnesium (Mg), % 2.0 to 2.9
93.9 to 96.8
Manganese (Mn), % 0 to 0.2
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.25
0
Silver (Ag), % 0
1.3 to 1.7
Titanium (Ti), % 0 to 0.1
0
Unspecified Rare Earths, % 0
1.5 to 3.0
Zinc (Zn), % 7.2 to 8.2
0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3