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5051A Aluminum vs. Grade 21 Titanium

5051A 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 5051A 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, % 18 to 21
9.0 to 17
Fatigue Strength, MPa 51 to 61
550 to 660
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
51
Shear Strength, MPa 110
550 to 790
Tensile Strength: Ultimate (UTS), MPa 170
890 to 1340
Tensile Strength: Yield (Proof), MPa 56
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 400
410
Maximum Temperature: Mechanical, °C 190
310
Melting Completion (Liquidus), °C 640
1740
Melting Onset (Solidus), °C 610
1690
Specific Heat Capacity, J/kg-K 900
500
Thermal Conductivity, W/m-K 150
7.5
Thermal Expansion, µm/m-K 23
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
60
Density, g/cm3 2.7
5.4
Embodied Carbon, kg CO2/kg material 8.5
32
Embodied Energy, MJ/kg 150
490
Embodied Water, L/kg 1190
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 27
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 23
2760 to 5010
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
32
Strength to Weight: Axial, points 17 to 18
46 to 69
Strength to Weight: Bending, points 25
38 to 50
Thermal Diffusivity, mm2/s 63
2.8
Thermal Shock Resistance, points 7.6
66 to 100

Alloy Composition


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Aluminum (Al), % 96.1 to 98.6
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0 to 0.3
0
Copper (Cu), % 0 to 0.050
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 0.45
0 to 0.4
Magnesium (Mg), % 1.4 to 2.1
0
Manganese (Mn), % 0 to 0.25
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 0.1
76 to 81.2
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0 to 0.4

Comparable Variants