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711.0 Aluminum vs. Grade 21 Titanium

711.0 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 (5, in this case) are not shown.

For each property being compared, the top bar is 711.0 aluminum and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
140
Elongation at Break, % 7.8
9.0 to 17
Fatigue Strength, MPa 100
550 to 660
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 27
51
Tensile Strength: Ultimate (UTS), MPa 220
890 to 1340
Tensile Strength: Yield (Proof), MPa 140
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 380
410
Maximum Temperature: Mechanical, °C 170
310
Melting Completion (Liquidus), °C 640
1740
Melting Onset (Solidus), °C 610
1690
Specific Heat Capacity, J/kg-K 860
500
Thermal Conductivity, W/m-K 160
7.5
Thermal Expansion, µm/m-K 24
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
60
Density, g/cm3 3.0
5.4
Embodied Carbon, kg CO2/kg material 7.9
32
Embodied Energy, MJ/kg 150
490
Embodied Water, L/kg 1120
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 140
2760 to 5010
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
32
Strength to Weight: Axial, points 20
46 to 69
Strength to Weight: Bending, points 26
38 to 50
Thermal Diffusivity, mm2/s 61
2.8
Thermal Shock Resistance, points 9.3
66 to 100

Alloy Composition

Aluminum (Al), % 89.8 to 92.7
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Copper (Cu), % 0.35 to 0.65
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0.7 to 1.4
0 to 0.4
Magnesium (Mg), % 0.25 to 0.45
0
Manganese (Mn), % 0 to 0.050
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), % 0 to 0.3
0.15 to 0.25
Titanium (Ti), % 0 to 0.2
76 to 81.2
Zinc (Zn), % 6.0 to 7.0
0
Residuals, % 0
0 to 0.4