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C68800 Brass vs. ZK61A Magnesium

C68800 brass belongs to the copper alloys classification, while ZK61A 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 C68800 brass and the bottom bar is ZK61A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
46
Elongation at Break, % 2.0 to 36
5.8 to 7.1
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 41
18
Shear Strength, MPa 380 to 510
170 to 180
Tensile Strength: Ultimate (UTS), MPa 570 to 890
290 to 310
Tensile Strength: Yield (Proof), MPa 390 to 790
180 to 200

Thermal Properties

Latent Heat of Fusion, J/g 190
330
Maximum Temperature: Mechanical, °C 160
120
Melting Completion (Liquidus), °C 960
640
Melting Onset (Solidus), °C 950
530
Specific Heat Capacity, J/kg-K 400
960
Thermal Conductivity, W/m-K 40
120
Thermal Expansion, µm/m-K 19
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 18
29
Electrical Conductivity: Equal Weight (Specific), % IACS 20
130

Otherwise Unclassified Properties

Base Metal Price, % relative 26
13
Density, g/cm3 8.2
1.9
Embodied Carbon, kg CO2/kg material 2.8
23
Embodied Energy, MJ/kg 48
160
Embodied Water, L/kg 350
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 16 to 180
15 to 19
Resilience: Unit (Modulus of Resilience), kJ/m3 710 to 2860
370 to 420
Stiffness to Weight: Axial, points 7.3
13
Stiffness to Weight: Bending, points 19
62
Strength to Weight: Axial, points 19 to 30
42 to 45
Strength to Weight: Bending, points 19 to 25
50 to 53
Thermal Diffusivity, mm2/s 12
65
Thermal Shock Resistance, points 19 to 30
17 to 18

Alloy Composition

Aluminum (Al), % 3.0 to 3.8
0
Cobalt (Co), % 0.25 to 0.55
0
Copper (Cu), % 70.8 to 75.5
0 to 0.1
Iron (Fe), % 0 to 0.2
0
Lead (Pb), % 0 to 0.050
0
Magnesium (Mg), % 0
92.1 to 93.9
Nickel (Ni), % 0
0 to 0.010
Zinc (Zn), % 21.3 to 24.1
5.5 to 6.5
Zirconium (Zr), % 0
0.6 to 1.0
Residuals, % 0
0 to 0.3