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Grade 21 Titanium vs. 1085 Aluminum

Grade 21 titanium belongs to the titanium alloys classification, while 1085 aluminum belongs to the aluminum alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is grade 21 titanium and the bottom bar is 1085 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
68
Elongation at Break, % 9.0 to 17
4.5 to 39
Fatigue Strength, MPa 550 to 660
22 to 49
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 51
26
Shear Strength, MPa 550 to 790
48 to 79
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
73 to 140
Tensile Strength: Yield (Proof), MPa 870 to 1170
17 to 120

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
640
Specific Heat Capacity, J/kg-K 500
900
Thermal Conductivity, W/m-K 7.5
230
Thermal Expansion, µm/m-K 7.1
23

Otherwise Unclassified Properties

Base Metal Price, % relative 60
9.5
Density, g/cm3 5.4
2.7
Embodied Carbon, kg CO2/kg material 32
8.3
Embodied Energy, MJ/kg 490
160
Embodied Water, L/kg 180
1200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
4.8 to 21
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
2.1 to 110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 32
50
Strength to Weight: Axial, points 46 to 69
7.5 to 14
Strength to Weight: Bending, points 38 to 50
14 to 22
Thermal Diffusivity, mm2/s 2.8
94
Thermal Shock Resistance, points 66 to 100
3.3 to 6.1

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
99.85 to 100
Carbon (C), % 0 to 0.050
0
Copper (Cu), % 0
0 to 0.030
Gallium (Ga), % 0
0 to 0.030
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
0 to 0.12
Magnesium (Mg), % 0
0 to 0.020
Manganese (Mn), % 0
0 to 0.020
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 0.1
Titanium (Ti), % 76 to 81.2
0 to 0.020
Vanadium (V), % 0
0 to 0.050
Zinc (Zn), % 0
0 to 0.030
Residuals, % 0 to 0.4
0 to 0.010

Comparable Variants