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AZ91B Magnesium vs. Titanium 15-3-3-3

AZ91B magnesium belongs to the magnesium alloys classification, while titanium 15-3-3-3 belongs to the titanium alloys. There are 29 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 AZ91B magnesium and the bottom bar is titanium 15-3-3-3.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
100
Elongation at Break, % 5.0
5.7 to 8.0
Fatigue Strength, MPa 79
610 to 710
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
39
Shear Strength, MPa 140
660 to 810
Tensile Strength: Ultimate (UTS), MPa 240
1120 to 1390
Tensile Strength: Yield (Proof), MPa 160
1100 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 360
390
Maximum Temperature: Mechanical, °C 130
430
Melting Completion (Liquidus), °C 600
1620
Melting Onset (Solidus), °C 470
1560
Specific Heat Capacity, J/kg-K 990
520
Thermal Conductivity, W/m-K 73
8.1
Thermal Expansion, µm/m-K 26
9.8

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.2
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
40
Density, g/cm3 1.7
4.8
Embodied Carbon, kg CO2/kg material 22
59
Embodied Energy, MJ/kg 160
950
Embodied Water, L/kg 990
260

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
78 to 89
Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 69
32
Strength to Weight: Axial, points 38
64 to 80
Strength to Weight: Bending, points 49
50 to 57
Thermal Diffusivity, mm2/s 42
3.2
Thermal Shock Resistance, points 14
79 to 98

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
Chromium (Cr), % 0
2.5 to 3.5
Copper (Cu), % 0 to 0.35
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0
0 to 0.25
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.13
Silicon (Si), % 0 to 0.5
0
Tin (Sn), % 0
2.5 to 3.5
Titanium (Ti), % 0
72.6 to 78.5
Vanadium (V), % 0
14 to 16
Zinc (Zn), % 0.35 to 1.0
0
Residuals, % 0
0 to 0.4