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7175 Aluminum vs. 8021 Aluminum

Both 7175 aluminum and 8021 aluminum are aluminum alloys. They have 90% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is 7175 aluminum and the bottom bar is 8021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
70
Elongation at Break, % 3.8 to 5.9
2.3
Fatigue Strength, MPa 150 to 180
61
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
26
Tensile Strength: Ultimate (UTS), MPa 520 to 570
160
Tensile Strength: Yield (Proof), MPa 430 to 490
130

Thermal Properties

Latent Heat of Fusion, J/g 380
400
Maximum Temperature: Mechanical, °C 180
170
Melting Completion (Liquidus), °C 640
650
Melting Onset (Solidus), °C 480
640
Specific Heat Capacity, J/kg-K 870
900
Thermal Conductivity, W/m-K 140
220
Thermal Expansion, µm/m-K 23
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
56
Electrical Conductivity: Equal Weight (Specific), % IACS 99
180

Otherwise Unclassified Properties

Base Metal Price, % relative 10
9.0
Density, g/cm3 3.0
2.8
Embodied Carbon, kg CO2/kg material 8.2
8.1
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1130
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 29
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 1310 to 1730
130
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
49
Strength to Weight: Axial, points 48 to 52
16
Strength to Weight: Bending, points 48 to 51
23
Thermal Diffusivity, mm2/s 53
88
Thermal Shock Resistance, points 23 to 25
7.0

Alloy Composition

Aluminum (Al), % 88 to 91.4
98 to 98.8
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.2 to 2.0
0 to 0.050
Iron (Fe), % 0 to 0.2
1.2 to 1.7
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.1
0
Silicon (Si), % 0 to 0.15
0 to 0.15
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.1 to 6.1
0
Residuals, % 0
0 to 0.15