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Grade 20 Titanium vs. ZK51A Magnesium

Grade 20 titanium belongs to the titanium alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 grade 20 titanium and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
45
Elongation at Break, % 5.7 to 17
4.7
Fatigue Strength, MPa 550 to 630
62
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 47
18
Shear Strength, MPa 560 to 740
160
Tensile Strength: Ultimate (UTS), MPa 900 to 1270
240
Tensile Strength: Yield (Proof), MPa 850 to 1190
150

Thermal Properties

Latent Heat of Fusion, J/g 400
340
Maximum Temperature: Mechanical, °C 370
120
Melting Completion (Liquidus), °C 1660
640
Melting Onset (Solidus), °C 1600
550
Specific Heat Capacity, J/kg-K 520
970
Thermal Expansion, µm/m-K 9.6
26

Otherwise Unclassified Properties

Density, g/cm3 5.0
1.8
Embodied Carbon, kg CO2/kg material 52
24
Embodied Energy, MJ/kg 860
160
Embodied Water, L/kg 350
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 150
10
Resilience: Unit (Modulus of Resilience), kJ/m3 2940 to 5760
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 33
64
Strength to Weight: Axial, points 50 to 70
36
Strength to Weight: Bending, points 41 to 52
47
Thermal Shock Resistance, points 55 to 77
15

Alloy Composition

Aluminum (Al), % 3.0 to 4.0
0
Carbon (C), % 0 to 0.050
0
Chromium (Cr), % 5.5 to 6.5
0
Copper (Cu), % 0
0 to 0.1
Hydrogen (H), % 0 to 0.020
0
Iron (Fe), % 0 to 0.3
0
Magnesium (Mg), % 0
93.1 to 95.9
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 0
0 to 0.010
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.12
0
Palladium (Pd), % 0.040 to 0.080
0
Titanium (Ti), % 71 to 77
0
Vanadium (V), % 7.5 to 8.5
0
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 3.5 to 4.5
0.5 to 1.0
Residuals, % 0
0 to 0.3