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7129 Aluminum vs. R30003 Cobalt

7129 Aluminum belongs to the aluminum alloys classification, while R30003 cobalt belongs to the cobalt alloys. There are 27 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 R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
210
Elongation at Break, % 9.0 to 9.1
10 to 73
Fatigue Strength, MPa 150 to 190
320 to 560
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
83
Tensile Strength: Ultimate (UTS), MPa 430
970 to 1720
Tensile Strength: Yield (Proof), MPa 380 to 390
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 380
310
Melting Completion (Liquidus), °C 630
1400
Melting Onset (Solidus), °C 510
1440
Specific Heat Capacity, J/kg-K 880
450
Thermal Conductivity, W/m-K 150
13
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
95
Density, g/cm3 2.9
8.4
Embodied Carbon, kg CO2/kg material 8.3
8.0
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1150
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
600 to 2790
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 41
32 to 57
Strength to Weight: Bending, points 43 to 44
26 to 38
Thermal Diffusivity, mm2/s 58
3.3
Thermal Shock Resistance, points 19
26 to 45

Alloy Composition

Aluminum (Al), % 91 to 94
0
Boron (B), % 0
0 to 0.1
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0 to 0.1
19 to 21
Cobalt (Co), % 0
39 to 41
Copper (Cu), % 0.5 to 0.9
0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
10 to 20.5
Magnesium (Mg), % 1.3 to 2.0
0
Manganese (Mn), % 0 to 0.1
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 0
14 to 16
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.15
0 to 1.2
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 4.2 to 5.2
0
Residuals, % 0 to 0.15
0