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R05240 Alloy vs. 7021 Aluminum

R05240 alloy belongs to the otherwise unclassified metals classification, while 7021 aluminum belongs to the aluminum alloys. There are 18 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is R05240 alloy and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 150
69
Elongation at Break, % 25
9.4
Poisson's Ratio 0.36
0.32
Shear Modulus, GPa 57
26
Tensile Strength: Ultimate (UTS), MPa 270
460
Tensile Strength: Yield (Proof), MPa 170
390

Thermal Properties

Latent Heat of Fusion, J/g 210
380
Specific Heat Capacity, J/kg-K 190
870
Thermal Expansion, µm/m-K 6.8
24

Otherwise Unclassified Properties

Density, g/cm3 14
2.9
Embodied Water, L/kg 460
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 59
41
Resilience: Unit (Modulus of Resilience), kJ/m3 90
1110
Stiffness to Weight: Axial, points 6.3
13
Stiffness to Weight: Bending, points 13
47
Strength to Weight: Axial, points 5.4
44
Strength to Weight: Bending, points 6.8
45
Thermal Shock Resistance, points 18
20

Alloy Composition

Aluminum (Al), % 0
90.7 to 93.7
Carbon (C), % 0 to 0.010
0
Chromium (Cr), % 0
0 to 0.050
Copper (Cu), % 0
0 to 0.25
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
0 to 0.4
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0
0 to 0.1
Molybdenum (Mo), % 0 to 0.020
0
Nickel (Ni), % 0 to 0.010
0
Niobium (Nb), % 35 to 42
0
Nitrogen (N), % 0 to 0.010
0
Oxygen (O), % 0 to 0.020
0
Silicon (Si), % 0 to 0.0050
0 to 0.25
Tantalum (Ta), % 57.9 to 65
0
Titanium (Ti), % 0 to 0.010
0 to 0.1
Tungsten (W), % 0 to 0.050
0
Zinc (Zn), % 0
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15