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AZ81A Magnesium vs. C87400 Brass

AZ81A magnesium belongs to the magnesium alloys classification, while C87400 brass 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 C87400 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 3.0 to 8.8
21
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
41
Tensile Strength: Ultimate (UTS), MPa 160 to 240
390
Tensile Strength: Yield (Proof), MPa 84
160

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 130
170
Melting Completion (Liquidus), °C 600
920
Melting Onset (Solidus), °C 500
820
Specific Heat Capacity, J/kg-K 990
400
Thermal Conductivity, W/m-K 84
28
Thermal Expansion, µm/m-K 27
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
6.7
Electrical Conductivity: Equal Weight (Specific), % IACS 65
7.2

Otherwise Unclassified Properties

Base Metal Price, % relative 12
27
Density, g/cm3 1.7
8.3
Embodied Carbon, kg CO2/kg material 23
2.7
Embodied Energy, MJ/kg 160
44
Embodied Water, L/kg 990
310

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
65
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
120
Stiffness to Weight: Axial, points 15
7.4
Stiffness to Weight: Bending, points 70
19
Strength to Weight: Axial, points 26 to 39
13
Strength to Weight: Bending, points 38 to 50
14
Thermal Diffusivity, mm2/s 50
8.3
Thermal Shock Resistance, points 9.1 to 14
14

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0 to 0.8
Copper (Cu), % 0 to 0.1
79 to 85.5
Lead (Pb), % 0
0 to 1.0
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0
Nickel (Ni), % 0 to 0.010
0
Silicon (Si), % 0 to 0.3
2.5 to 4.0
Zinc (Zn), % 0.4 to 1.0
12 to 16
Residuals, % 0 to 0.3
0 to 0.8