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AZ81A Magnesium vs. C85900 Brass

AZ81A magnesium belongs to the magnesium alloys classification, while C85900 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 C85900 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 55
85
Elastic (Young's, Tensile) Modulus, GPa 46
100
Elongation at Break, % 3.0 to 8.8
30
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
40
Tensile Strength: Ultimate (UTS), MPa 160 to 240
460
Tensile Strength: Yield (Proof), MPa 84
190

Thermal Properties

Latent Heat of Fusion, J/g 350
170
Maximum Temperature: Mechanical, °C 130
130
Melting Completion (Liquidus), °C 600
830
Melting Onset (Solidus), °C 500
790
Specific Heat Capacity, J/kg-K 990
390
Thermal Conductivity, W/m-K 84
89
Thermal Expansion, µm/m-K 27
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
25
Electrical Conductivity: Equal Weight (Specific), % IACS 65
28

Otherwise Unclassified Properties

Base Metal Price, % relative 12
24
Density, g/cm3 1.7
8.0
Embodied Carbon, kg CO2/kg material 23
2.9
Embodied Energy, MJ/kg 160
49
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
170
Stiffness to Weight: Axial, points 15
7.3
Stiffness to Weight: Bending, points 70
20
Strength to Weight: Axial, points 26 to 39
16
Strength to Weight: Bending, points 38 to 50
17
Thermal Diffusivity, mm2/s 50
29
Thermal Shock Resistance, points 9.1 to 14
16

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0.1 to 0.6
Antimony (Sb), % 0
0 to 0.2
Boron (B), % 0
0 to 0.2
Copper (Cu), % 0 to 0.1
58 to 62
Iron (Fe), % 0
0 to 0.5
Lead (Pb), % 0
0 to 0.090
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0 to 0.010
Nickel (Ni), % 0 to 0.010
0 to 1.5
Phosphorus (P), % 0
0 to 0.010
Silicon (Si), % 0 to 0.3
0 to 0.25
Sulfur (S), % 0
0.1 to 0.65
Tin (Sn), % 0
0 to 1.5
Zinc (Zn), % 0.4 to 1.0
31 to 41
Zirconium (Zr), % 0
0 to 0.2
Residuals, % 0 to 0.3
0 to 0.7