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AZ81A Magnesium vs. CC767S Brass

AZ81A magnesium belongs to the magnesium alloys classification, while CC767S brass belongs to the copper alloys. There are 29 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 AZ81A magnesium and the bottom bar is CC767S brass.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 55
86
Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 3.0 to 8.8
34
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
40
Tensile Strength: Ultimate (UTS), MPa 160 to 240
430
Tensile Strength: Yield (Proof), MPa 84
150

Thermal Properties

Latent Heat of Fusion, J/g 350
180
Maximum Temperature: Mechanical, °C 130
120
Melting Completion (Liquidus), °C 600
840
Melting Onset (Solidus), °C 500
790
Specific Heat Capacity, J/kg-K 990
390
Thermal Conductivity, W/m-K 84
110
Thermal Expansion, µm/m-K 27
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
32
Electrical Conductivity: Equal Weight (Specific), % IACS 65
36

Otherwise Unclassified Properties

Base Metal Price, % relative 12
23
Density, g/cm3 1.7
8.0
Embodied Carbon, kg CO2/kg material 23
2.7
Embodied Energy, MJ/kg 160
47
Embodied Water, L/kg 990
330

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
110
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
100
Stiffness to Weight: Axial, points 15
7.3
Stiffness to Weight: Bending, points 70
20
Strength to Weight: Axial, points 26 to 39
15
Strength to Weight: Bending, points 38 to 50
16
Thermal Diffusivity, mm2/s 50
34
Thermal Shock Resistance, points 9.1 to 14
14

Alloy Composition


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Aluminum (Al), % 7.0 to 8.1
0.1 to 0.8
Copper (Cu), % 0 to 0.1
58 to 64
Iron (Fe), % 0
0 to 0.5
Lead (Pb), % 0
0 to 0.1
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0 to 0.5
Nickel (Ni), % 0 to 0.010
0 to 1.0
Silicon (Si), % 0 to 0.3
0 to 0.2
Tin (Sn), % 0
0 to 0.1
Zinc (Zn), % 0.4 to 1.0
32.8 to 41.9
Residuals, % 0 to 0.3
0