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A384.0 Aluminum vs. Grade 21 Titanium

A384.0 aluminum belongs to the aluminum alloys classification, while grade 21 titanium belongs to the titanium 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 A384.0 aluminum and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 74
140
Elongation at Break, % 2.5
9.0 to 17
Fatigue Strength, MPa 140
550 to 660
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 28
51
Shear Strength, MPa 200
550 to 790
Tensile Strength: Ultimate (UTS), MPa 330
890 to 1340
Tensile Strength: Yield (Proof), MPa 170
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 550
410
Maximum Temperature: Mechanical, °C 170
310
Melting Completion (Liquidus), °C 610
1740
Melting Onset (Solidus), °C 510
1690
Specific Heat Capacity, J/kg-K 880
500
Thermal Conductivity, W/m-K 96
7.5
Thermal Expansion, µm/m-K 21
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 11
60
Density, g/cm3 2.8
5.4
Embodied Carbon, kg CO2/kg material 7.5
32
Embodied Energy, MJ/kg 140
490
Embodied Water, L/kg 1010
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.9
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 180
2760 to 5010
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 50
32
Strength to Weight: Axial, points 32
46 to 69
Strength to Weight: Bending, points 38
38 to 50
Thermal Diffusivity, mm2/s 39
2.8
Thermal Shock Resistance, points 15
66 to 100

Alloy Composition


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Aluminum (Al), % 79.3 to 86.5
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Copper (Cu), % 3.0 to 4.5
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 1.3
0 to 0.4
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.5
0
Molybdenum (Mo), % 0
14 to 16
Nickel (Ni), % 0 to 0.5
0
Niobium (Nb), % 0
2.2 to 3.2
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.17
Silicon (Si), % 10.5 to 12
0.15 to 0.25
Tin (Sn), % 0 to 0.35
0
Titanium (Ti), % 0
76 to 81.2
Zinc (Zn), % 0 to 1.0
0
Residuals, % 0 to 0.5
0 to 0.4