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7049 Aluminum vs. R30605 Cobalt

7049 aluminum belongs to the aluminum alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 25 material properties with values for both materials. Properties with values for just one material (6, 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 7049 aluminum and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
210
Elongation at Break, % 6.2 to 7.0
34
Fatigue Strength, MPa 160 to 170
260 to 590
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
81
Tensile Strength: Ultimate (UTS), MPa 510 to 530
1130 to 1900
Tensile Strength: Yield (Proof), MPa 420 to 450
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Melting Completion (Liquidus), °C 640
1410
Melting Onset (Solidus), °C 480
1330
Specific Heat Capacity, J/kg-K 860
410
Thermal Conductivity, W/m-K 130
9.6
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 110
1.8

Otherwise Unclassified Properties

Density, g/cm3 3.1
9.6
Embodied Carbon, kg CO2/kg material 8.1
9.8
Embodied Energy, MJ/kg 140
140
Embodied Water, L/kg 1110
450

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 45
21
Strength to Weight: Axial, points 46 to 47
33 to 55
Strength to Weight: Bending, points 46 to 47
25 to 36
Thermal Diffusivity, mm2/s 51
2.5
Thermal Shock Resistance, points 22 to 23
31 to 52

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0.1 to 0.22
19 to 21
Cobalt (Co), % 0
46.4 to 57
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
0 to 3.0
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
1.0 to 2.0
Nickel (Ni), % 0
9.0 to 11
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.25
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
14 to 16
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0