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7129 Aluminum vs. G-CoCr28 Cobalt

7129 Aluminum belongs to the aluminum alloys classification, while G-CoCr28 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 G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
210
Elongation at Break, % 9.0 to 9.1
6.7
Fatigue Strength, MPa 150 to 190
130
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
83
Tensile Strength: Ultimate (UTS), MPa 430
560
Tensile Strength: Yield (Proof), MPa 380 to 390
260

Thermal Properties

Latent Heat of Fusion, J/g 380
320
Maximum Temperature: Mechanical, °C 180
1200
Melting Completion (Liquidus), °C 630
1330
Melting Onset (Solidus), °C 510
1270
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
8.5
Thermal Expansion, µm/m-K 24
14

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
100
Density, g/cm3 2.9
8.1
Embodied Carbon, kg CO2/kg material 8.3
6.2
Embodied Energy, MJ/kg 150
84
Embodied Water, L/kg 1150
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
31
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
160
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 41
19
Strength to Weight: Bending, points 43 to 44
19
Thermal Diffusivity, mm2/s 58
2.2
Thermal Shock Resistance, points 19
14

Alloy Composition

Aluminum (Al), % 91 to 94
0
Carbon (C), % 0
0.050 to 0.25
Chromium (Cr), % 0 to 0.1
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 0.5 to 0.9
0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
9.7 to 24.5
Magnesium (Mg), % 1.3 to 2.0
0
Manganese (Mn), % 0 to 0.1
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.15
0.5 to 1.5
Sulfur (S), % 0
0 to 0.030
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