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AZ81A Magnesium vs. Grade 25 Titanium

AZ81A magnesium belongs to the magnesium alloys classification, while grade 25 titanium belongs to the titanium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 AZ81A magnesium and the bottom bar is grade 25 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 3.0 to 8.8
11
Fatigue Strength, MPa 78 to 80
550
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 18
40
Shear Strength, MPa 91 to 130
600
Tensile Strength: Ultimate (UTS), MPa 160 to 240
1000
Tensile Strength: Yield (Proof), MPa 84
940

Thermal Properties

Latent Heat of Fusion, J/g 350
410
Maximum Temperature: Mechanical, °C 130
340
Melting Completion (Liquidus), °C 600
1610
Melting Onset (Solidus), °C 500
1560
Specific Heat Capacity, J/kg-K 990
560
Thermal Conductivity, W/m-K 84
7.1
Thermal Expansion, µm/m-K 27
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 65
2.0

Otherwise Unclassified Properties

Density, g/cm3 1.7
4.5
Embodied Carbon, kg CO2/kg material 23
43
Embodied Energy, MJ/kg 160
700
Embodied Water, L/kg 990
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
110
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
4220
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 70
35
Strength to Weight: Axial, points 26 to 39
62
Strength to Weight: Bending, points 38 to 50
50
Thermal Diffusivity, mm2/s 50
2.8
Thermal Shock Resistance, points 9.1 to 14
71

Alloy Composition


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Aluminum (Al), % 7.0 to 8.1
5.5 to 6.8
Carbon (C), % 0
0 to 0.080
Copper (Cu), % 0 to 0.1
0
Hydrogen (H), % 0
0 to 0.013
Iron (Fe), % 0
0 to 0.4
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0
Nickel (Ni), % 0 to 0.010
0.3 to 0.8
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.2
Palladium (Pd), % 0
0.040 to 0.080
Silicon (Si), % 0 to 0.3
0
Titanium (Ti), % 0
86.7 to 90.6
Vanadium (V), % 0
3.5 to 4.5
Zinc (Zn), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0 to 0.4