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5042 Aluminum vs. 7021 Aluminum

Both 5042 aluminum and 7021 aluminum are aluminum alloys. They have a moderately high 94% of their average alloy composition in common.

For each property being compared, the top bar is 5042 aluminum and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
69
Elongation at Break, % 1.1 to 3.4
9.4
Fatigue Strength, MPa 97 to 120
150
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
26
Shear Strength, MPa 200
270
Tensile Strength: Ultimate (UTS), MPa 340 to 360
460
Tensile Strength: Yield (Proof), MPa 270 to 310
390

Thermal Properties

Latent Heat of Fusion, J/g 400
380
Maximum Temperature: Mechanical, °C 180
200
Melting Completion (Liquidus), °C 640
630
Melting Onset (Solidus), °C 570
510
Specific Heat Capacity, J/kg-K 900
870
Thermal Conductivity, W/m-K 130
150
Thermal Expansion, µm/m-K 24
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
38
Electrical Conductivity: Equal Weight (Specific), % IACS 110
120

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.7
2.9
Embodied Carbon, kg CO2/kg material 8.8
8.3
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.6 to 12
41
Resilience: Unit (Modulus of Resilience), kJ/m3 550 to 720
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
47
Strength to Weight: Axial, points 35 to 37
44
Strength to Weight: Bending, points 40 to 42
45
Thermal Diffusivity, mm2/s 53
59
Thermal Shock Resistance, points 15 to 16
20

Alloy Composition

Aluminum (Al), % 94.2 to 96.8
90.7 to 93.7
Chromium (Cr), % 0 to 0.1
0 to 0.050
Copper (Cu), % 0 to 0.15
0 to 0.25
Iron (Fe), % 0 to 0.35
0 to 0.4
Magnesium (Mg), % 3.0 to 4.0
1.2 to 1.8
Manganese (Mn), % 0.2 to 0.5
0 to 0.1
Silicon (Si), % 0 to 0.2
0 to 0.25
Titanium (Ti), % 0 to 0.1
0 to 0.1
Zinc (Zn), % 0 to 0.25
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15