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EN-MC21320 Magnesium vs. C68700 Brass

EN-MC21320 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 (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 EN-MC21320 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 18
41
Tensile Strength: Ultimate (UTS), MPa 230
390
Tensile Strength: Yield (Proof), MPa 140
140

Thermal Properties

Latent Heat of Fusion, J/g 370
190
Maximum Temperature: Mechanical, °C 110
160
Melting Completion (Liquidus), °C 600
970
Melting Onset (Solidus), °C 530
930
Specific Heat Capacity, J/kg-K 1000
400
Thermal Conductivity, W/m-K 66
100
Thermal Expansion, µm/m-K 26
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
23
Electrical Conductivity: Equal Weight (Specific), % IACS 91
25

Otherwise Unclassified Properties

Base Metal Price, % relative 12
26
Density, g/cm3 1.6
8.3
Embodied Carbon, kg CO2/kg material 23
2.8
Embodied Energy, MJ/kg 160
46
Embodied Water, L/kg 980
340

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 200
90
Stiffness to Weight: Axial, points 15
7.3
Stiffness to Weight: Bending, points 72
19
Strength to Weight: Axial, points 38
13
Strength to Weight: Bending, points 50
14
Thermal Diffusivity, mm2/s 40
30
Thermal Shock Resistance, points 13
13

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
1.8 to 2.5
Arsenic (As), % 0
0.020 to 0.1
Copper (Cu), % 0 to 0.010
76 to 79
Iron (Fe), % 0 to 0.0050
0 to 0.060
Lead (Pb), % 0
0 to 0.070
Magnesium (Mg), % 92.5 to 95.9
0
Manganese (Mn), % 0.1 to 0.7
0
Nickel (Ni), % 0 to 0.0020
0
Silicon (Si), % 0.5 to 1.5
0
Zinc (Zn), % 0 to 0.2
17.8 to 22.2
Residuals, % 0 to 0.010
0 to 0.5