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Grade 21 Titanium vs. ZK51A Magnesium

Grade 21 titanium belongs to the titanium alloys classification, while ZK51A magnesium belongs to the magnesium 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. 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 21 titanium and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
45
Elongation at Break, % 9.0 to 17
4.7
Fatigue Strength, MPa 550 to 660
62
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 51
18
Shear Strength, MPa 550 to 790
160
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
240
Tensile Strength: Yield (Proof), MPa 870 to 1170
150

Thermal Properties

Latent Heat of Fusion, J/g 410
340
Maximum Temperature: Mechanical, °C 310
120
Melting Completion (Liquidus), °C 1740
640
Melting Onset (Solidus), °C 1690
550
Specific Heat Capacity, J/kg-K 500
970
Thermal Conductivity, W/m-K 7.5
110
Thermal Expansion, µm/m-K 7.1
26

Otherwise Unclassified Properties

Base Metal Price, % relative 60
13
Density, g/cm3 5.4
1.8
Embodied Carbon, kg CO2/kg material 32
24
Embodied Energy, MJ/kg 490
160
Embodied Water, L/kg 180
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
10
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 32
64
Strength to Weight: Axial, points 46 to 69
36
Strength to Weight: Bending, points 38 to 50
47
Thermal Diffusivity, mm2/s 2.8
61
Thermal Shock Resistance, points 66 to 100
15

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.050
0
Copper (Cu), % 0
0 to 0.1
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
0
Magnesium (Mg), % 0
93.1 to 95.9
Molybdenum (Mo), % 14 to 16
0
Nickel (Ni), % 0
0 to 0.010
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0
Silicon (Si), % 0.15 to 0.25
0
Titanium (Ti), % 76 to 81.2
0
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3