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ZK40A Magnesium vs. C68700 Brass

ZK40A magnesium belongs to the magnesium alloys classification, while C68700 brass belongs to the copper alloys. There are 26 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 ZK40A magnesium and the bottom bar is C68700 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
110
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 17
41
Tensile Strength: Ultimate (UTS), MPa 280
390
Tensile Strength: Yield (Proof), MPa 260
140

Thermal Properties

Latent Heat of Fusion, J/g 340
190
Maximum Temperature: Mechanical, °C 120
160
Melting Completion (Liquidus), °C 600
970
Melting Onset (Solidus), °C 540
930
Specific Heat Capacity, J/kg-K 970
400
Thermal Conductivity, W/m-K 110
100
Thermal Expansion, µm/m-K 26
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
23
Electrical Conductivity: Equal Weight (Specific), % IACS 130
25

Otherwise Unclassified Properties

Base Metal Price, % relative 13
26
Density, g/cm3 1.8
8.3
Embodied Carbon, kg CO2/kg material 24
2.8
Embodied Energy, MJ/kg 160
46
Embodied Water, L/kg 950
340

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 740
90
Stiffness to Weight: Axial, points 14
7.3
Stiffness to Weight: Bending, points 65
19
Strength to Weight: Axial, points 43
13
Strength to Weight: Bending, points 53
14
Thermal Diffusivity, mm2/s 62
30
Thermal Shock Resistance, points 17
13

Alloy Composition


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Aluminum (Al), % 0
1.8 to 2.5
Arsenic (As), % 0
0.020 to 0.1
Copper (Cu), % 0
76 to 79
Iron (Fe), % 0
0 to 0.060
Lead (Pb), % 0
0 to 0.070
Magnesium (Mg), % 94.2 to 96.1
0
Zinc (Zn), % 3.5 to 4.5
17.8 to 22.2
Zirconium (Zr), % 0.45 to 1.0
0
Residuals, % 0 to 0.3
0 to 0.5