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AZ91A Magnesium vs. Grade 4 Titanium

AZ91A magnesium belongs to the magnesium alloys classification, while grade 4 titanium belongs to the titanium alloys. There are 31 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 AZ91A magnesium and the bottom bar is grade 4 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
200
Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 5.0
17
Fatigue Strength, MPa 99
340
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 18
41
Shear Strength, MPa 140
390
Tensile Strength: Ultimate (UTS), MPa 240
640
Tensile Strength: Yield (Proof), MPa 160
530

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
19
Thermal Expansion, µm/m-K 26
9.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
3.1
Electrical Conductivity: Equal Weight (Specific), % IACS 52
6.3

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
500
Embodied Water, L/kg 990
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
100
Resilience: Unit (Modulus of Resilience), kJ/m3 280
1330
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
35
Strength to Weight: Axial, points 38
40
Strength to Weight: Bending, points 49
37
Thermal Diffusivity, mm2/s 42
7.6
Thermal Shock Resistance, points 14
46

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.080
Copper (Cu), % 0 to 0.1
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 88.2 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 0.4
Silicon (Si), % 0 to 0.5
0
Titanium (Ti), % 0
98.6 to 100
Zinc (Zn), % 0.35 to 1.0
0
Residuals, % 0
0 to 0.4