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AZ91A Magnesium vs. Grade 20 Titanium

AZ91A magnesium belongs to the magnesium alloys classification, while grade 20 titanium belongs to the titanium alloys. There are 25 material properties with values for both materials. Properties with values for just one material (9, 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 AZ91A magnesium and the bottom bar is grade 20 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
120
Elongation at Break, % 5.0
5.7 to 17
Fatigue Strength, MPa 99
550 to 630
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 18
47
Shear Strength, MPa 140
560 to 740
Tensile Strength: Ultimate (UTS), MPa 240
900 to 1270
Tensile Strength: Yield (Proof), MPa 160
850 to 1190

Thermal Properties

Latent Heat of Fusion, J/g 360
400
Maximum Temperature: Mechanical, °C 130
370
Melting Completion (Liquidus), °C 600
1660
Melting Onset (Solidus), °C 470
1600
Specific Heat Capacity, J/kg-K 990
520
Thermal Expansion, µm/m-K 26
9.6

Otherwise Unclassified Properties

Density, g/cm3 1.7
5.0
Embodied Carbon, kg CO2/kg material 22
52
Embodied Energy, MJ/kg 160
860
Embodied Water, L/kg 990
350

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
71 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 280
2940 to 5760
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
33
Strength to Weight: Axial, points 38
50 to 70
Strength to Weight: Bending, points 49
41 to 52
Thermal Shock Resistance, points 14
55 to 77

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
3.0 to 4.0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
5.5 to 6.5
Copper (Cu), % 0 to 0.1
0
Hydrogen (H), % 0
0 to 0.020
Iron (Fe), % 0
0 to 0.3
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0 to 0.030
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.12
Palladium (Pd), % 0
0.040 to 0.080
Silicon (Si), % 0 to 0.5
0
Titanium (Ti), % 0
71 to 77
Vanadium (V), % 0
7.5 to 8.5
Zinc (Zn), % 0.35 to 1.0
0
Zirconium (Zr), % 0
3.5 to 4.5
Residuals, % 0
0 to 0.4