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C21000 Brass vs. ZK51A Magnesium

C21000 brass belongs to the copper alloys classification, while ZK51A magnesium belongs to the magnesium 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 C21000 brass and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
45
Elongation at Break, % 2.9 to 50
4.7
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 43
18
Shear Strength, MPa 180 to 280
160
Tensile Strength: Ultimate (UTS), MPa 240 to 450
240
Tensile Strength: Yield (Proof), MPa 69 to 440
150

Thermal Properties

Latent Heat of Fusion, J/g 200
340
Maximum Temperature: Mechanical, °C 190
120
Melting Completion (Liquidus), °C 1070
640
Melting Onset (Solidus), °C 1050
550
Specific Heat Capacity, J/kg-K 390
970
Thermal Conductivity, W/m-K 230
110
Thermal Expansion, µm/m-K 18
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
28
Electrical Conductivity: Equal Weight (Specific), % IACS 57
140

Otherwise Unclassified Properties

Base Metal Price, % relative 30
13
Density, g/cm3 8.8
1.8
Embodied Carbon, kg CO2/kg material 2.6
24
Embodied Energy, MJ/kg 42
160
Embodied Water, L/kg 310
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 100
10
Resilience: Unit (Modulus of Resilience), kJ/m3 21 to 830
260
Stiffness to Weight: Axial, points 7.2
14
Stiffness to Weight: Bending, points 18
64
Strength to Weight: Axial, points 7.4 to 14
36
Strength to Weight: Bending, points 9.6 to 15
47
Thermal Diffusivity, mm2/s 69
61
Thermal Shock Resistance, points 8.1 to 15
15

Alloy Composition

Copper (Cu), % 94 to 96
0 to 0.1
Iron (Fe), % 0 to 0.050
0
Lead (Pb), % 0 to 0.030
0
Magnesium (Mg), % 0
93.1 to 95.9
Nickel (Ni), % 0
0 to 0.010
Zinc (Zn), % 3.7 to 6.0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3