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2095 Aluminum vs. Grade 21 Titanium

2095 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 (4, in this case) are not shown.

For each property being compared, the top bar is 2095 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, % 8.5
9.0 to 17
Fatigue Strength, MPa 200
550 to 660
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
51
Shear Strength, MPa 410
550 to 790
Tensile Strength: Ultimate (UTS), MPa 700
890 to 1340
Tensile Strength: Yield (Proof), MPa 610
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 390
410
Maximum Temperature: Mechanical, °C 210
310
Melting Completion (Liquidus), °C 660
1740
Melting Onset (Solidus), °C 540
1690
Specific Heat Capacity, J/kg-K 910
500
Thermal Conductivity, W/m-K 130
7.5
Thermal Expansion, µm/m-K 23
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 31
60
Density, g/cm3 3.0
5.4
Embodied Carbon, kg CO2/kg material 8.6
32
Embodied Energy, MJ/kg 160
490
Embodied Water, L/kg 1470
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 2640
2760 to 5010
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
32
Strength to Weight: Axial, points 65
46 to 69
Strength to Weight: Bending, points 59
38 to 50
Thermal Diffusivity, mm2/s 49
2.8
Thermal Shock Resistance, points 31
66 to 100

Alloy Composition

Aluminum (Al), % 91.3 to 94.9
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Copper (Cu), % 3.9 to 4.6
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 0.15
0 to 0.4
Lithium (Li), % 0.7 to 1.5
0
Magnesium (Mg), % 0.25 to 0.8
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 0.12
0.15 to 0.25
Silver (Ag), % 0.25 to 0.6
0
Titanium (Ti), % 0 to 0.1
76 to 81.2
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0.040 to 0.18
0
Residuals, % 0
0 to 0.4