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2218 Aluminum vs. M1A Magnesium

2218 aluminum belongs to the aluminum alloys classification, while M1A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is 2218 aluminum and the bottom bar is M1A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
45
Elongation at Break, % 6.8 to 10
5.5
Fatigue Strength, MPa 110
88
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
18
Shear Strength, MPa 210 to 250
120
Tensile Strength: Ultimate (UTS), MPa 330 to 430
230
Tensile Strength: Yield (Proof), MPa 260 to 310
130

Thermal Properties

Latent Heat of Fusion, J/g 390
350
Maximum Temperature: Mechanical, °C 220
95
Melting Completion (Liquidus), °C 640
610
Melting Onset (Solidus), °C 510
580
Specific Heat Capacity, J/kg-K 870
990
Thermal Conductivity, W/m-K 140
150
Thermal Expansion, µm/m-K 22
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
35
Electrical Conductivity: Equal Weight (Specific), % IACS 110
190

Otherwise Unclassified Properties

Base Metal Price, % relative 11
12
Density, g/cm3 3.1
1.7
Embodied Carbon, kg CO2/kg material 8.2
24
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1130
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
11
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
180
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 45
71
Strength to Weight: Axial, points 30 to 39
38
Strength to Weight: Bending, points 34 to 41
49
Thermal Diffusivity, mm2/s 52
88
Thermal Shock Resistance, points 15 to 19
13

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0
Calcium (Ca), % 0
0 to 0.3
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
0 to 0.050
Iron (Fe), % 0 to 1.0
0
Magnesium (Mg), % 1.2 to 1.8
97.2 to 98.8
Manganese (Mn), % 0 to 0.2
1.2 to 2.0
Nickel (Ni), % 1.7 to 2.3
0 to 0.010
Silicon (Si), % 0 to 0.9
0 to 0.1
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0
0 to 0.3