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AZ91B Magnesium vs. Grade C-2 Titanium

AZ91B magnesium belongs to the magnesium alloys classification, while grade C-2 titanium belongs to the titanium alloys. There are 30 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 grade C-2 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
180
Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 5.0
17
Fatigue Strength, MPa 79
200
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 18
40
Tensile Strength: Ultimate (UTS), MPa 240
390
Tensile Strength: Yield (Proof), MPa 160
310

Thermal Properties

Latent Heat of Fusion, J/g 360
420
Maximum Temperature: Mechanical, °C 130
320
Melting Completion (Liquidus), °C 600
1660
Melting Onset (Solidus), °C 470
1610
Specific Heat Capacity, J/kg-K 990
540
Thermal Conductivity, W/m-K 73
21
Thermal Expansion, µm/m-K 26
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 58
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
37
Density, g/cm3 1.7
4.5
Embodied Carbon, kg CO2/kg material 22
31
Embodied Energy, MJ/kg 160
510
Embodied Water, L/kg 990
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
61
Resilience: Unit (Modulus of Resilience), kJ/m3 280
460
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
35
Strength to Weight: Axial, points 38
24
Strength to Weight: Bending, points 49
26
Thermal Diffusivity, mm2/s 42
8.8
Thermal Shock Resistance, points 14
30

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.1
Copper (Cu), % 0 to 0.35
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0
0 to 0.2
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0 to 0.050
Oxygen (O), % 0
0 to 0.4
Silicon (Si), % 0 to 0.5
0
Titanium (Ti), % 0
98.8 to 100
Zinc (Zn), % 0.35 to 1.0
0
Residuals, % 0
0 to 0.4