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7129 Aluminum vs. Grade 3 Titanium

7129 Aluminum belongs to the aluminum alloys classification, while grade 3 titanium belongs to the titanium alloys. There are 30 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 7129 Aluminum and the bottom bar is grade 3 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
110
Elongation at Break, % 9.0 to 9.1
21
Fatigue Strength, MPa 150 to 190
300
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
39
Shear Strength, MPa 250 to 260
320
Tensile Strength: Ultimate (UTS), MPa 430
510
Tensile Strength: Yield (Proof), MPa 380 to 390
440

Thermal Properties

Latent Heat of Fusion, J/g 380
420
Maximum Temperature: Mechanical, °C 180
320
Melting Completion (Liquidus), °C 630
1660
Melting Onset (Solidus), °C 510
1610
Specific Heat Capacity, J/kg-K 880
540
Thermal Conductivity, W/m-K 150
21
Thermal Expansion, µm/m-K 24
9.2

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
3.3
Electrical Conductivity: Equal Weight (Specific), % IACS 120
6.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
37
Density, g/cm3 2.9
4.5
Embodied Carbon, kg CO2/kg material 8.3
31
Embodied Energy, MJ/kg 150
510
Embodied Water, L/kg 1150
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
100
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
910
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
35
Strength to Weight: Axial, points 41
32
Strength to Weight: Bending, points 43 to 44
32
Thermal Diffusivity, mm2/s 58
8.6
Thermal Shock Resistance, points 19
37

Alloy Composition

Aluminum (Al), % 91 to 94
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 0.5 to 0.9
0
Gallium (Ga), % 0 to 0.030
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 0.3
0 to 0.3
Magnesium (Mg), % 1.3 to 2.0
0
Manganese (Mn), % 0 to 0.1
0
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.35
Silicon (Si), % 0 to 0.15
0
Titanium (Ti), % 0 to 0.050
98.8 to 100
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 4.2 to 5.2
0
Residuals, % 0
0 to 0.4