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Grade 21 Titanium vs. 4004 Aluminum

Grade 21 titanium belongs to the titanium alloys classification, while 4004 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. 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 grade 21 titanium and the bottom bar is 4004 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
71
Elongation at Break, % 9.0 to 17
2.4
Fatigue Strength, MPa 550 to 660
42
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 51
27
Shear Strength, MPa 550 to 790
63
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
110
Tensile Strength: Yield (Proof), MPa 870 to 1170
60

Thermal Properties

Latent Heat of Fusion, J/g 410
540
Maximum Temperature: Mechanical, °C 310
160
Melting Completion (Liquidus), °C 1740
600
Melting Onset (Solidus), °C 1690
560
Specific Heat Capacity, J/kg-K 500
910
Thermal Conductivity, W/m-K 7.5
130
Thermal Expansion, µm/m-K 7.1
22

Otherwise Unclassified Properties

Base Metal Price, % relative 60
9.5
Density, g/cm3 5.4
2.6
Embodied Carbon, kg CO2/kg material 32
8.0
Embodied Energy, MJ/kg 490
150
Embodied Water, L/kg 180
1070

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
25
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 32
54
Strength to Weight: Axial, points 46 to 69
12
Strength to Weight: Bending, points 38 to 50
20
Thermal Diffusivity, mm2/s 2.8
58
Thermal Shock Resistance, points 66 to 100
5.1

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
86 to 90
Carbon (C), % 0 to 0.050
0
Copper (Cu), % 0
0 to 0.25
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
0 to 0.8
Magnesium (Mg), % 0
1.0 to 2.0
Manganese (Mn), % 0
0 to 0.1
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
9.0 to 10.5
Titanium (Ti), % 76 to 81.2
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0 to 0.4
0 to 0.15