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ZK40A Magnesium vs. Grade 21 Titanium

ZK40A magnesium belongs to the magnesium 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 (3, 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 ZK40A magnesium and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
140
Elongation at Break, % 4.2
9.0 to 17
Fatigue Strength, MPa 190
550 to 660
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 17
51
Shear Strength, MPa 160
550 to 790
Tensile Strength: Ultimate (UTS), MPa 280
890 to 1340
Tensile Strength: Yield (Proof), MPa 260
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 340
410
Maximum Temperature: Mechanical, °C 120
310
Melting Completion (Liquidus), °C 600
1740
Melting Onset (Solidus), °C 540
1690
Specific Heat Capacity, J/kg-K 970
500
Thermal Conductivity, W/m-K 110
7.5
Thermal Expansion, µm/m-K 26
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 13
60
Density, g/cm3 1.8
5.4
Embodied Carbon, kg CO2/kg material 24
32
Embodied Energy, MJ/kg 160
490
Embodied Water, L/kg 950
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 740
2760 to 5010
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 65
32
Strength to Weight: Axial, points 43
46 to 69
Strength to Weight: Bending, points 53
38 to 50
Thermal Diffusivity, mm2/s 62
2.8
Thermal Shock Resistance, points 17
66 to 100

Alloy Composition


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Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0
0 to 0.4
Magnesium (Mg), % 94.2 to 96.1
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
0.15 to 0.25
Titanium (Ti), % 0
76 to 81.2
Zinc (Zn), % 3.5 to 4.5
0
Zirconium (Zr), % 0.45 to 1.0
0
Residuals, % 0 to 0.3
0 to 0.4