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Grade 21 Titanium vs. M1A Magnesium

Grade 21 titanium belongs to the titanium alloys classification, while M1A magnesium belongs to the magnesium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, 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 grade 21 titanium and the bottom bar is M1A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
45
Elongation at Break, % 9.0 to 17
5.5
Fatigue Strength, MPa 550 to 660
88
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 51
18
Shear Strength, MPa 550 to 790
120
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
230
Tensile Strength: Yield (Proof), MPa 870 to 1170
130

Thermal Properties

Latent Heat of Fusion, J/g 410
350
Maximum Temperature: Mechanical, °C 310
95
Melting Completion (Liquidus), °C 1740
610
Melting Onset (Solidus), °C 1690
580
Specific Heat Capacity, J/kg-K 500
990
Thermal Conductivity, W/m-K 7.5
150
Thermal Expansion, µm/m-K 7.1
26

Otherwise Unclassified Properties

Base Metal Price, % relative 60
12
Density, g/cm3 5.4
1.7
Embodied Carbon, kg CO2/kg material 32
24
Embodied Energy, MJ/kg 490
160
Embodied Water, L/kg 180
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
11
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
180
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 32
71
Strength to Weight: Axial, points 46 to 69
38
Strength to Weight: Bending, points 38 to 50
49
Thermal Diffusivity, mm2/s 2.8
88
Thermal Shock Resistance, points 66 to 100
13

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Calcium (Ca), % 0
0 to 0.3
Carbon (C), % 0 to 0.050
0
Copper (Cu), % 0
0 to 0.050
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
0
Magnesium (Mg), % 0
97.2 to 98.8
Manganese (Mn), % 0
1.2 to 2.0
Molybdenum (Mo), % 14 to 16
0
Nickel (Ni), % 0
0 to 0.010
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0
Silicon (Si), % 0.15 to 0.25
0 to 0.1
Titanium (Ti), % 76 to 81.2
0
Residuals, % 0
0 to 0.3