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ZK51A Magnesium vs. 5251 Aluminum

ZK51A magnesium belongs to the magnesium alloys classification, while 5251 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ZK51A magnesium and the bottom bar is 5251 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
68
Elongation at Break, % 4.7
2.0 to 19
Fatigue Strength, MPa 62
59 to 110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
26
Shear Strength, MPa 160
110 to 160
Tensile Strength: Ultimate (UTS), MPa 240
180 to 280
Tensile Strength: Yield (Proof), MPa 150
67 to 250

Thermal Properties

Latent Heat of Fusion, J/g 340
400
Maximum Temperature: Mechanical, °C 120
180
Melting Completion (Liquidus), °C 640
650
Melting Onset (Solidus), °C 550
610
Specific Heat Capacity, J/kg-K 970
900
Thermal Conductivity, W/m-K 110
150
Thermal Expansion, µm/m-K 26
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 28
37
Electrical Conductivity: Equal Weight (Specific), % IACS 140
120

Otherwise Unclassified Properties

Base Metal Price, % relative 13
9.5
Density, g/cm3 1.8
2.7
Embodied Carbon, kg CO2/kg material 24
8.5
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 940
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 10
5.4 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 260
33 to 450
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 64
50
Strength to Weight: Axial, points 36
18 to 29
Strength to Weight: Bending, points 47
26 to 35
Thermal Diffusivity, mm2/s 61
61
Thermal Shock Resistance, points 15
7.9 to 13

Alloy Composition

Aluminum (Al), % 0
95.5 to 98.2
Chromium (Cr), % 0
0 to 0.15
Copper (Cu), % 0 to 0.1
0 to 0.15
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 93.1 to 95.9
1.7 to 2.4
Manganese (Mn), % 0
0.1 to 0.5
Nickel (Ni), % 0 to 0.010
0
Silicon (Si), % 0
0 to 0.4
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 3.6 to 5.5
0 to 0.15
Zirconium (Zr), % 0.5 to 1.0
0
Residuals, % 0
0 to 0.15