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Grade 21 Titanium vs. EN AC-51300 Aluminum

Grade 21 titanium belongs to the titanium alloys classification, while EN AC-51300 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is grade 21 titanium and the bottom bar is EN AC-51300 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
67
Elongation at Break, % 9.0 to 17
3.7
Fatigue Strength, MPa 550 to 660
78
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 51
25
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
190
Tensile Strength: Yield (Proof), MPa 870 to 1170
110

Thermal Properties

Latent Heat of Fusion, J/g 410
400
Maximum Temperature: Mechanical, °C 310
170
Melting Completion (Liquidus), °C 1740
640
Melting Onset (Solidus), °C 1690
600
Specific Heat Capacity, J/kg-K 500
910
Thermal Conductivity, W/m-K 7.5
110
Thermal Expansion, µm/m-K 7.1
24

Otherwise Unclassified Properties

Base Metal Price, % relative 60
9.5
Density, g/cm3 5.4
2.7
Embodied Carbon, kg CO2/kg material 32
9.1
Embodied Energy, MJ/kg 490
150
Embodied Water, L/kg 180
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
6.1
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
87
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 32
51
Strength to Weight: Axial, points 46 to 69
20
Strength to Weight: Bending, points 38 to 50
28
Thermal Diffusivity, mm2/s 2.8
45
Thermal Shock Resistance, points 66 to 100
8.6

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
91.4 to 95.5
Carbon (C), % 0 to 0.050
0
Copper (Cu), % 0
0 to 0.1
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
0 to 0.55
Magnesium (Mg), % 0
4.5 to 6.5
Manganese (Mn), % 0
0 to 0.45
Molybdenum (Mo), % 14 to 16
0
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0
Silicon (Si), % 0.15 to 0.25
0 to 0.55
Titanium (Ti), % 76 to 81.2
0 to 0.2
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0 to 0.4
0 to 0.15