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Grade 21 Titanium vs. 5251 Aluminum

Grade 21 titanium belongs to the titanium alloys classification, while 5251 aluminum belongs to the aluminum alloys. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is grade 21 titanium and the bottom bar is 5251 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
68
Elongation at Break, % 9.0 to 17
2.0 to 19
Fatigue Strength, MPa 550 to 660
59 to 110
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 51
26
Shear Strength, MPa 550 to 790
110 to 160
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
180 to 280
Tensile Strength: Yield (Proof), MPa 870 to 1170
67 to 250

Thermal Properties

Latent Heat of Fusion, J/g 410
400
Maximum Temperature: Mechanical, °C 310
180
Melting Completion (Liquidus), °C 1740
650
Melting Onset (Solidus), °C 1690
610
Specific Heat Capacity, J/kg-K 500
900
Thermal Conductivity, W/m-K 7.5
150
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
8.5
Embodied Energy, MJ/kg 490
150
Embodied Water, L/kg 180
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
5.4 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
33 to 450
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 32
50
Strength to Weight: Axial, points 46 to 69
18 to 29
Strength to Weight: Bending, points 38 to 50
26 to 35
Thermal Diffusivity, mm2/s 2.8
61
Thermal Shock Resistance, points 66 to 100
7.9 to 13

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
95.5 to 98.2
Carbon (C), % 0 to 0.050
0
Chromium (Cr), % 0
0 to 0.15
Copper (Cu), % 0
0 to 0.15
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
0 to 0.5
Magnesium (Mg), % 0
1.7 to 2.4
Manganese (Mn), % 0
0.1 to 0.5
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 0.4
Titanium (Ti), % 76 to 81.2
0 to 0.15
Zinc (Zn), % 0
0 to 0.15
Residuals, % 0
0 to 0.15

Comparable Variants