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EN AC-47000 Aluminum vs. Grade 21 Titanium

EN AC-47000 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. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is EN AC-47000 aluminum and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
140
Elongation at Break, % 1.7
9.0 to 17
Fatigue Strength, MPa 68
550 to 660
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 27
51
Tensile Strength: Ultimate (UTS), MPa 180
890 to 1340
Tensile Strength: Yield (Proof), MPa 97
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 570
410
Maximum Temperature: Mechanical, °C 170
310
Melting Completion (Liquidus), °C 590
1740
Melting Onset (Solidus), °C 570
1690
Specific Heat Capacity, J/kg-K 900
500
Thermal Conductivity, W/m-K 130
7.5
Thermal Expansion, µm/m-K 21
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
60
Density, g/cm3 2.6
5.4
Embodied Carbon, kg CO2/kg material 7.7
32
Embodied Energy, MJ/kg 140
490
Embodied Water, L/kg 1040
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.5
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 65
2760 to 5010
Stiffness to Weight: Axial, points 16
14
Stiffness to Weight: Bending, points 54
32
Strength to Weight: Axial, points 19
46 to 69
Strength to Weight: Bending, points 27
38 to 50
Thermal Diffusivity, mm2/s 55
2.8
Thermal Shock Resistance, points 8.3
66 to 100

Alloy Composition

Aluminum (Al), % 82.1 to 89.5
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 0 to 1.0
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 0.8
0 to 0.4
Lead (Pb), % 0 to 0.2
0
Magnesium (Mg), % 0 to 0.35
0
Manganese (Mn), % 0.050 to 0.55
0
Molybdenum (Mo), % 0
14 to 16
Nickel (Ni), % 0 to 0.3
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 13.5
0.15 to 0.25
Tin (Sn), % 0 to 0.1
0
Titanium (Ti), % 0 to 0.2
76 to 81.2
Zinc (Zn), % 0 to 0.55
0
Residuals, % 0
0 to 0.4