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AZ81A Magnesium vs. C85700 Brass

AZ81A magnesium belongs to the magnesium alloys classification, while C85700 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 C85700 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
100
Elongation at Break, % 3.0 to 8.8
17
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
40
Tensile Strength: Ultimate (UTS), MPa 160 to 240
310
Tensile Strength: Yield (Proof), MPa 84
110

Thermal Properties

Latent Heat of Fusion, J/g 350
170
Maximum Temperature: Mechanical, °C 130
120
Melting Completion (Liquidus), °C 600
940
Melting Onset (Solidus), °C 500
910
Specific Heat Capacity, J/kg-K 990
380
Thermal Conductivity, W/m-K 84
84
Thermal Expansion, µm/m-K 27
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
22
Electrical Conductivity: Equal Weight (Specific), % IACS 65
25

Otherwise Unclassified Properties

Base Metal Price, % relative 12
24
Density, g/cm3 1.7
8.0
Embodied Carbon, kg CO2/kg material 23
2.8
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
41
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
59
Stiffness to Weight: Axial, points 15
7.2
Stiffness to Weight: Bending, points 70
20
Strength to Weight: Axial, points 26 to 39
11
Strength to Weight: Bending, points 38 to 50
13
Thermal Diffusivity, mm2/s 50
27
Thermal Shock Resistance, points 9.1 to 14
10

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0 to 0.8
Copper (Cu), % 0 to 0.1
58 to 64
Iron (Fe), % 0
0 to 0.7
Lead (Pb), % 0
0.8 to 1.5
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0
Nickel (Ni), % 0 to 0.010
0 to 1.0
Silicon (Si), % 0 to 0.3
0 to 0.050
Tin (Sn), % 0
0.5 to 1.5
Zinc (Zn), % 0.4 to 1.0
32 to 40
Residuals, % 0 to 0.3
0 to 1.3