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AZ81A Magnesium vs. C99400 Brass

AZ81A magnesium belongs to the magnesium alloys classification, while C99400 brass belongs to the copper alloys. There are 24 material properties with values for both materials. Properties with values for just one material (9, 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 C99400 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
120
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
44
Tensile Strength: Ultimate (UTS), MPa 160 to 240
460 to 550
Tensile Strength: Yield (Proof), MPa 84
230 to 370

Thermal Properties

Latent Heat of Fusion, J/g 350
230
Maximum Temperature: Mechanical, °C 130
200
Melting Completion (Liquidus), °C 600
1070
Melting Onset (Solidus), °C 500
1020
Specific Heat Capacity, J/kg-K 990
400
Thermal Expansion, µm/m-K 27
17

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 12
30
Density, g/cm3 1.7
8.7
Embodied Carbon, kg CO2/kg material 23
2.8
Embodied Energy, MJ/kg 160
45
Embodied Water, L/kg 990
310

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
230 to 590
Stiffness to Weight: Axial, points 15
7.5
Stiffness to Weight: Bending, points 70
19
Strength to Weight: Axial, points 26 to 39
15 to 17
Strength to Weight: Bending, points 38 to 50
15 to 17
Thermal Shock Resistance, points 9.1 to 14
16 to 19

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0.5 to 2.0
Copper (Cu), % 0 to 0.1
83.5 to 96.5
Iron (Fe), % 0
1.0 to 3.0
Lead (Pb), % 0
0 to 0.25
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0 to 0.5
Nickel (Ni), % 0 to 0.010
1.0 to 3.5
Silicon (Si), % 0 to 0.3
0.5 to 2.0
Zinc (Zn), % 0.4 to 1.0
0.5 to 5.0
Residuals, % 0 to 0.3
0 to 0.3

Comparable Variants