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8021 Aluminum vs. Grade 21 Titanium

8021 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 8021 aluminum and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
140
Elongation at Break, % 2.3
9.0 to 17
Fatigue Strength, MPa 61
550 to 660
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
51
Tensile Strength: Ultimate (UTS), MPa 160
890 to 1340
Tensile Strength: Yield (Proof), MPa 130
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 400
410
Maximum Temperature: Mechanical, °C 170
310
Melting Completion (Liquidus), °C 650
1740
Melting Onset (Solidus), °C 640
1690
Specific Heat Capacity, J/kg-K 900
500
Thermal Conductivity, W/m-K 220
7.5
Thermal Expansion, µm/m-K 23
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
60
Density, g/cm3 2.8
5.4
Embodied Carbon, kg CO2/kg material 8.1
32
Embodied Energy, MJ/kg 150
490
Embodied Water, L/kg 1180
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.4
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 130
2760 to 5010
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 49
32
Strength to Weight: Axial, points 16
46 to 69
Strength to Weight: Bending, points 23
38 to 50
Thermal Diffusivity, mm2/s 88
2.8
Thermal Shock Resistance, points 7.0
66 to 100

Alloy Composition

Aluminum (Al), % 98 to 98.8
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Copper (Cu), % 0 to 0.050
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 1.2 to 1.7
0 to 0.4
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), % 0 to 0.15
0.15 to 0.25
Titanium (Ti), % 0
76 to 81.2
Residuals, % 0
0 to 0.4