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ASTM B817 Type II vs. R31537 Cobalt

ASTM B817 type II belongs to the titanium alloys classification, while R31537 cobalt belongs to the cobalt alloys. There are 24 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ASTM B817 type II and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
220
Elongation at Break, % 3.0 to 13
14 to 23
Fatigue Strength, MPa 390 to 530
310 to 480
Poisson's Ratio 0.32
0.29
Reduction in Area, % 4.0 to 13
13 to 23
Shear Modulus, GPa 40
87
Tensile Strength: Ultimate (UTS), MPa 900 to 960
1000 to 1340
Tensile Strength: Yield (Proof), MPa 780 to 900
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 400
320
Melting Completion (Liquidus), °C 1580
1360
Melting Onset (Solidus), °C 1530
1290
Specific Heat Capacity, J/kg-K 550
450
Thermal Expansion, µm/m-K 9.9
13

Otherwise Unclassified Properties

Density, g/cm3 4.6
8.4
Embodied Carbon, kg CO2/kg material 40
8.1
Embodied Energy, MJ/kg 650
110
Embodied Water, L/kg 220
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 26 to 120
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 2890 to 3890
780 to 1990
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 34
24
Strength to Weight: Axial, points 55 to 58
33 to 44
Strength to Weight: Bending, points 45 to 47
26 to 32
Thermal Shock Resistance, points 62 to 66
24 to 32

Alloy Composition

Aluminum (Al), % 5.0 to 6.0
0
Carbon (C), % 0 to 0.1
0 to 0.14
Chlorine (Cl), % 0 to 0.2
0
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.9 to 69
Copper (Cu), % 0.35 to 1.0
0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0.35 to 1.0
0 to 0.75
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0 to 0.040
0 to 0.25
Oxygen (O), % 0 to 0.3
0
Silicon (Si), % 0 to 0.1
0 to 1.0
Sodium (Na), % 0 to 0.2
0
Tin (Sn), % 1.5 to 2.5
0
Titanium (Ti), % 82.1 to 87.8
0
Vanadium (V), % 5.0 to 6.0
0
Residuals, % 0 to 0.4
0