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Grade 18 Titanium vs. Titanium 4-4-2

Both grade 18 titanium and titanium 4-4-2 are titanium alloys. They have a moderately high 92% of their average alloy composition in common. 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 grade 18 titanium and the bottom bar is titanium 4-4-2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 11 to 17
10
Fatigue Strength, MPa 330 to 480
590 to 620
Poisson's Ratio 0.32
0.32
Reduction in Area, % 23
20
Shear Modulus, GPa 40
42
Shear Strength, MPa 420 to 590
690 to 750
Tensile Strength: Ultimate (UTS), MPa 690 to 980
1150 to 1250
Tensile Strength: Yield (Proof), MPa 540 to 810
1030 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 410
410
Maximum Temperature: Mechanical, °C 330
310
Melting Completion (Liquidus), °C 1640
1610
Melting Onset (Solidus), °C 1590
1560
Specific Heat Capacity, J/kg-K 550
540
Thermal Conductivity, W/m-K 8.3
6.7
Thermal Expansion, µm/m-K 9.9
8.6

Otherwise Unclassified Properties

Density, g/cm3 4.5
4.7
Embodied Carbon, kg CO2/kg material 41
30
Embodied Energy, MJ/kg 670
480
Embodied Water, L/kg 270
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 110
110 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 1380 to 3110
4700 to 5160
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
34
Strength to Weight: Axial, points 43 to 61
68 to 74
Strength to Weight: Bending, points 39 to 49
52 to 55
Thermal Diffusivity, mm2/s 3.4
2.6
Thermal Shock Resistance, points 47 to 67
86 to 93

Alloy Composition


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Aluminum (Al), % 2.5 to 3.5
3.0 to 5.0
Carbon (C), % 0 to 0.080
0 to 0.080
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 0 to 0.25
0 to 0.2
Molybdenum (Mo), % 0
3.0 to 5.0
Nitrogen (N), % 0 to 0.030
0 to 0.050
Oxygen (O), % 0 to 0.15
0 to 0.25
Palladium (Pd), % 0.040 to 0.080
0
Silicon (Si), % 0
0.3 to 0.7
Tin (Sn), % 0
1.5 to 2.5
Titanium (Ti), % 92.5 to 95.5
85.8 to 92.2
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0 to 0.4

Comparable Variants