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AZ81A Magnesium vs. C66700 Brass

AZ81A magnesium belongs to the magnesium alloys classification, while C66700 brass belongs to the copper alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, 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 C66700 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 3.0 to 8.8
2.0 to 58
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
41
Shear Strength, MPa 91 to 130
250 to 530
Tensile Strength: Ultimate (UTS), MPa 160 to 240
340 to 690
Tensile Strength: Yield (Proof), MPa 84
100 to 640

Thermal Properties

Latent Heat of Fusion, J/g 350
180
Maximum Temperature: Mechanical, °C 130
140
Melting Completion (Liquidus), °C 600
1090
Melting Onset (Solidus), °C 500
1050
Specific Heat Capacity, J/kg-K 990
390
Thermal Conductivity, W/m-K 84
97
Thermal Expansion, µm/m-K 27
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
17
Electrical Conductivity: Equal Weight (Specific), % IACS 65
19

Otherwise Unclassified Properties

Base Metal Price, % relative 12
25
Density, g/cm3 1.7
8.2
Embodied Carbon, kg CO2/kg material 23
2.7
Embodied Energy, MJ/kg 160
45
Embodied Water, L/kg 990
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
13 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
49 to 1900
Stiffness to Weight: Axial, points 15
7.3
Stiffness to Weight: Bending, points 70
19
Strength to Weight: Axial, points 26 to 39
11 to 23
Strength to Weight: Bending, points 38 to 50
13 to 21
Thermal Diffusivity, mm2/s 50
30
Thermal Shock Resistance, points 9.1 to 14
11 to 23

Alloy Composition


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Aluminum (Al), % 7.0 to 8.1
0
Copper (Cu), % 0 to 0.1
68.5 to 71.5
Iron (Fe), % 0
0 to 0.1
Lead (Pb), % 0
0 to 0.070
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0.8 to 1.5
Nickel (Ni), % 0 to 0.010
0
Silicon (Si), % 0 to 0.3
0
Zinc (Zn), % 0.4 to 1.0
26.3 to 30.7
Residuals, % 0 to 0.3
0 to 0.5