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7129 Aluminum vs. R30035 Cobalt

7129 Aluminum belongs to the aluminum alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, 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 7129 Aluminum and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
220 to 230
Elongation at Break, % 9.0 to 9.1
9.0 to 46
Fatigue Strength, MPa 150 to 190
170 to 740
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
84 to 89
Tensile Strength: Ultimate (UTS), MPa 430
900 to 1900
Tensile Strength: Yield (Proof), MPa 380 to 390
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 380
320
Melting Completion (Liquidus), °C 630
1440
Melting Onset (Solidus), °C 510
1320
Specific Heat Capacity, J/kg-K 880
440
Thermal Conductivity, W/m-K 150
11
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 120
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
100
Density, g/cm3 2.9
8.7
Embodied Carbon, kg CO2/kg material 8.3
10
Embodied Energy, MJ/kg 150
140
Embodied Water, L/kg 1150
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
210 to 5920
Stiffness to Weight: Axial, points 13
14 to 15
Stiffness to Weight: Bending, points 47
23 to 24
Strength to Weight: Axial, points 41
29 to 61
Strength to Weight: Bending, points 43 to 44
24 to 39
Thermal Diffusivity, mm2/s 58
3.0
Thermal Shock Resistance, points 19
23 to 46

Alloy Composition

Aluminum (Al), % 91 to 94
0
Boron (B), % 0
0 to 0.015
Carbon (C), % 0
0 to 0.025
Chromium (Cr), % 0 to 0.1
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0.5 to 0.9
0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
0 to 1.0
Magnesium (Mg), % 1.3 to 2.0
0
Manganese (Mn), % 0 to 0.1
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 0
33 to 37
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.15
0 to 0.15
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0 to 0.050
0 to 1.0
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 4.2 to 5.2
0
Residuals, % 0 to 0.15
0