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7049 Aluminum vs. R30008 Cobalt

7049 aluminum belongs to the aluminum alloys classification, while R30008 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (8, 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 R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
210
Elongation at Break, % 6.2 to 7.0
1.1 to 73
Fatigue Strength, MPa 160 to 170
320 to 530
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
83
Tensile Strength: Ultimate (UTS), MPa 510 to 530
950 to 1700
Tensile Strength: Yield (Proof), MPa 420 to 450
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 370
320
Melting Completion (Liquidus), °C 640
1400
Melting Onset (Solidus), °C 480
1330
Specific Heat Capacity, J/kg-K 860
450
Thermal Expansion, µm/m-K 23
13

Otherwise Unclassified Properties

Base Metal Price, % relative 10
95
Density, g/cm3 3.1
8.4
Embodied Carbon, kg CO2/kg material 8.1
8.1
Embodied Energy, MJ/kg 140
110
Embodied Water, L/kg 1110
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
590 to 2720
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 46 to 47
31 to 56
Strength to Weight: Bending, points 46 to 47
25 to 37
Thermal Shock Resistance, points 22 to 23
25 to 44

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Boron (B), % 0
0 to 0.0010
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0.1 to 0.22
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
7.6 to 20
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
1.0 to 2.0
Molybdenum (Mo), % 0
6.5 to 7.5
Nickel (Ni), % 0
15 to 18
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.25
0 to 1.2
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0