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ISO-WD43150 Magnesium vs. Grade 21 Titanium

ISO-WD43150 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 ISO-WD43150 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, % 2.8
9.0 to 17
Fatigue Strength, MPa 100
550 to 660
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 18
51
Shear Strength, MPa 140
550 to 790
Tensile Strength: Ultimate (UTS), MPa 250
890 to 1340
Tensile Strength: Yield (Proof), MPa 150
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 350
410
Maximum Temperature: Mechanical, °C 95
310
Melting Completion (Liquidus), °C 610
1740
Melting Onset (Solidus), °C 590
1690
Specific Heat Capacity, J/kg-K 990
500
Thermal Conductivity, W/m-K 140
7.5
Thermal Expansion, µm/m-K 27
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
60
Density, g/cm3 1.7
5.4
Embodied Carbon, kg CO2/kg material 24
32
Embodied Energy, MJ/kg 160
490
Embodied Water, L/kg 970
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.1
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 250
2760 to 5010
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 71
32
Strength to Weight: Axial, points 41
46 to 69
Strength to Weight: Bending, points 52
38 to 50
Thermal Diffusivity, mm2/s 81
2.8
Thermal Shock Resistance, points 14
66 to 100

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Copper (Cu), % 0 to 0.050
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0
0 to 0.4
Magnesium (Mg), % 97.5 to 98.8
0
Manganese (Mn), % 1.2 to 2.0
0
Molybdenum (Mo), % 0
14 to 16
Nickel (Ni), % 0 to 0.010
0
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 to 0.1
0.15 to 0.25
Titanium (Ti), % 0
76 to 81.2
Residuals, % 0 to 0.3
0 to 0.4