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AZ81A Magnesium vs. C68300 Brass

AZ81A magnesium belongs to the magnesium alloys classification, while C68300 brass belongs to the copper alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, 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 C68300 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
100
Elongation at Break, % 3.0 to 8.8
15
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
40
Shear Strength, MPa 91 to 130
260
Tensile Strength: Ultimate (UTS), MPa 160 to 240
430
Tensile Strength: Yield (Proof), MPa 84
260

Thermal Properties

Latent Heat of Fusion, J/g 350
180
Maximum Temperature: Mechanical, °C 130
120
Melting Completion (Liquidus), °C 600
900
Melting Onset (Solidus), °C 500
890
Specific Heat Capacity, J/kg-K 990
390
Thermal Conductivity, W/m-K 84
120
Thermal Expansion, µm/m-K 27
20

Otherwise Unclassified Properties

Base Metal Price, % relative 12
23
Density, g/cm3 1.7
8.0
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
56
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
330
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
38
Thermal Shock Resistance, points 9.1 to 14
14

Alloy Composition


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Aluminum (Al), % 7.0 to 8.1
0
Antimony (Sb), % 0
0.3 to 1.0
Cadmium (Cd), % 0
0 to 0.010
Copper (Cu), % 0 to 0.1
59 to 63
Lead (Pb), % 0
0 to 0.090
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
0.3 to 1.0
Tin (Sn), % 0
0.050 to 0.2
Zinc (Zn), % 0.4 to 1.0
34.2 to 40.4
Residuals, % 0 to 0.3
0 to 0.5