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AZ81A Magnesium vs. C84400 Valve Metal

AZ81A magnesium belongs to the magnesium alloys classification, while C84400 valve metal belongs to the copper alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, 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 AZ81A magnesium and the bottom bar is C84400 valve metal.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
100
Elongation at Break, % 3.0 to 8.8
19
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
39
Tensile Strength: Ultimate (UTS), MPa 160 to 240
230
Tensile Strength: Yield (Proof), MPa 84
110

Thermal Properties

Latent Heat of Fusion, J/g 350
180
Maximum Temperature: Mechanical, °C 130
160
Melting Completion (Liquidus), °C 600
1000
Melting Onset (Solidus), °C 500
840
Specific Heat Capacity, J/kg-K 990
370
Thermal Conductivity, W/m-K 84
72
Thermal Expansion, µm/m-K 27
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
16
Electrical Conductivity: Equal Weight (Specific), % IACS 65
17

Otherwise Unclassified Properties

Base Metal Price, % relative 12
29
Density, g/cm3 1.7
8.8
Embodied Carbon, kg CO2/kg material 23
2.8
Embodied Energy, MJ/kg 160
46
Embodied Water, L/kg 990
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
36
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
58
Stiffness to Weight: Axial, points 15
6.6
Stiffness to Weight: Bending, points 70
18
Strength to Weight: Axial, points 26 to 39
7.2
Strength to Weight: Bending, points 38 to 50
9.4
Thermal Diffusivity, mm2/s 50
22
Thermal Shock Resistance, points 9.1 to 14
8.3

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0 to 0.0050
Antimony (Sb), % 0
0 to 0.25
Copper (Cu), % 0 to 0.1
78 to 82
Iron (Fe), % 0
0 to 0.4
Lead (Pb), % 0
6.0 to 8.0
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0
Nickel (Ni), % 0 to 0.010
0 to 1.0
Phosphorus (P), % 0
0 to 1.5
Silicon (Si), % 0 to 0.3
0 to 0.0050
Sulfur (S), % 0
0 to 0.080
Tin (Sn), % 0
2.3 to 3.5
Zinc (Zn), % 0.4 to 1.0
7.0 to 10
Residuals, % 0 to 0.3
0 to 0.7