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238.0 Aluminum vs. Grade 21 Titanium

238.0 aluminum belongs to the aluminum alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 27 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 238.0 aluminum and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 76
140
Elongation at Break, % 1.5
9.0 to 17
Fatigue Strength, MPa 110
550 to 660
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 28
51
Tensile Strength: Ultimate (UTS), MPa 210
890 to 1340
Tensile Strength: Yield (Proof), MPa 170
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 430
410
Maximum Temperature: Mechanical, °C 170
310
Melting Completion (Liquidus), °C 600
1740
Melting Onset (Solidus), °C 510
1690
Specific Heat Capacity, J/kg-K 840
500
Thermal Conductivity, W/m-K 100
7.5
Thermal Expansion, µm/m-K 21
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
60
Density, g/cm3 3.4
5.4
Embodied Carbon, kg CO2/kg material 7.4
32
Embodied Energy, MJ/kg 140
490
Embodied Water, L/kg 1040
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.9
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 180
2760 to 5010
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 42
32
Strength to Weight: Axial, points 17
46 to 69
Strength to Weight: Bending, points 23
38 to 50
Thermal Diffusivity, mm2/s 37
2.8
Thermal Shock Resistance, points 9.1
66 to 100

Alloy Composition

Aluminum (Al), % 81.9 to 84.9
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Copper (Cu), % 9.5 to 10.5
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 1.0 to 1.5
0 to 0.4
Magnesium (Mg), % 0 to 0.25
0
Molybdenum (Mo), % 0
14 to 16
Niobium (Nb), % 0
2.2 to 3.2
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.17
Silicon (Si), % 3.6 to 4.4
0.15 to 0.25
Titanium (Ti), % 0
76 to 81.2
Zinc (Zn), % 1.0 to 1.5
0
Residuals, % 0
0 to 0.4