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EN AC-51500 Aluminum vs. Grade 21 Titanium

EN AC-51500 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-51500 aluminum and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
140
Elongation at Break, % 5.6
9.0 to 17
Fatigue Strength, MPa 120
550 to 660
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
51
Tensile Strength: Ultimate (UTS), MPa 280
890 to 1340
Tensile Strength: Yield (Proof), MPa 160
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 430
410
Maximum Temperature: Mechanical, °C 170
310
Melting Completion (Liquidus), °C 630
1740
Melting Onset (Solidus), °C 590
1690
Specific Heat Capacity, J/kg-K 910
500
Thermal Conductivity, W/m-K 120
7.5
Thermal Expansion, µm/m-K 23
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 9.0
32
Embodied Energy, MJ/kg 150
490
Embodied Water, L/kg 1150
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 190
2760 to 5010
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 52
32
Strength to Weight: Axial, points 29
46 to 69
Strength to Weight: Bending, points 36
38 to 50
Thermal Diffusivity, mm2/s 49
2.8
Thermal Shock Resistance, points 13
66 to 100

Alloy Composition

Aluminum (Al), % 89.8 to 93.1
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), % 0 to 0.25
0 to 0.4
Magnesium (Mg), % 4.7 to 6.0
0
Manganese (Mn), % 0.4 to 0.8
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), % 1.8 to 2.6
0.15 to 0.25
Titanium (Ti), % 0 to 0.25
76 to 81.2
Zinc (Zn), % 0 to 0.070
0
Residuals, % 0
0 to 0.4