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AZ91B Magnesium vs. Grade 21 Titanium

AZ91B 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 (6, 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 AZ91B magnesium and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
140
Elongation at Break, % 5.0
9.0 to 17
Fatigue Strength, MPa 79
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 240
890 to 1340
Tensile Strength: Yield (Proof), MPa 160
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 360
410
Maximum Temperature: Mechanical, °C 130
310
Melting Completion (Liquidus), °C 600
1740
Melting Onset (Solidus), °C 470
1690
Specific Heat Capacity, J/kg-K 990
500
Thermal Conductivity, W/m-K 73
7.5
Thermal Expansion, µm/m-K 26
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
60
Density, g/cm3 1.7
5.4
Embodied Carbon, kg CO2/kg material 22
32
Embodied Energy, MJ/kg 160
490
Embodied Water, L/kg 990
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 280
2760 to 5010
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
32
Strength to Weight: Axial, points 38
46 to 69
Strength to Weight: Bending, points 49
38 to 50
Thermal Diffusivity, mm2/s 42
2.8
Thermal Shock Resistance, points 14
66 to 100

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Copper (Cu), % 0 to 0.35
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0
0 to 0.4
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Molybdenum (Mo), % 0
14 to 16
Nickel (Ni), % 0 to 0.030
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 0.5
0.15 to 0.25
Titanium (Ti), % 0
76 to 81.2
Zinc (Zn), % 0.35 to 1.0
0
Residuals, % 0
0 to 0.4